Wednesday, 22 August 2018

A Journey into Astrophotography

I'll say one good thing for He-Who-Must-Not-Be-Retweeted; he's encouraged me to turn my attention away from this increasingly nonsensical planet and back into deep space*. I've dabbled with astrophotography before (hand-tracking with a 50 mm lens), but mostly I've stuck to the brighter objects like the moon and Jupiter. Long-exposure astrophotography at focal lengths greater than 300 mm requires precise motorised tracking, but it was only after a trip to Astrofest 2018 (and some intensive research) that I figured out a practical and affordable way to go about it.

Here's a picture of the trusty Tele Vue-60 (the same scope I use for most of my wildlife shots) in its latest mode atop the equally trusty Vixen Super Polaris mount (fitted with Skywatcher dual-axis motor drives and an ADM dovetail plate adaptor):


With a field-flattener attached the TV-60 is roughly equivalent to a lens of 400 mm focal length. So far, this arrangement is good enough for exposures up to about two minutes duration depending on the accuracy of my polar alignment. (The Skywatcher handset does have an ST-4 port for autoguiding should I wish to attempt longer exposures in the future.) Here's another angle showing the motor drives attached to the Right Ascension and Declination axes:


Any serious astrophotographers visiting this blog might be shaking their heads at this point and muttering about vignetting and edge-of-field distortion, red sensitivity, thermal noise etc. in much the same way that serious wildlife photographers might mutter about autofocus and aperture control when they see what I'm using. But the point is, I don't get enough clear, moonless nights a year to justify spending the kind of megabucks that others spend on their gear. And, crucially, I can use the same DSLR and the same little scope for multiple purposes (which probably explains why the focuser is starting to look a little worse for wear). And (whisper it quietly) one good photo of the Orion Nebula looks very much like another good photo of the Orion Nebula, no matter where you are on the earth. Unless you have your own observatory equipped with an adaptive optics system, you're probably not breaking new ground.

That's not to say I won't be eagerly imaging the Orion Nebula when I get the chance just like every other amateur, but M42 is a spectacle of the winter sky, so for my first target I chose the globular cluster M13 (because it's big, bright, and not too far away from the north celestial pole):

M13 Globular Cluster
M13, Tele Vue-60 + Canon 80D (30 x 1 min @ ISO 800)

The long exposure times required to make an image like this turn pinprick stars into blobs of light, giving the false impression that they are almost touching each other. Although direct interactions in globular clusters do occasionally happen (the most likely origin of blue stragglers), the average distance between stars in a typical globular is actually 0.1 to 0.5 light-years, a fraction of the distance between here and Proxima Centauri (4.2 light-years), but still many times the size of our planetary system. This image from the Hubble Space Telescope resolves the core of M13, giving a better impression of the star density. Around 150 globular clusters are known to orbit our galaxy, dipping in and out of the galactic plane in highly inclined orbits. To put that in perspective, M87, the giant galaxy at the heart of the Virgo Cluster, is surrounded by 16,000 globular clusters.

I recently had the pleasure of looking at M13 through a 10-inch telescope and the result was breath-taking (so much so that I completely forgot to look for NGC 6207 - the "little" galaxy visible towards the bottom-left of the image above).

In my 4-inch achromat M13 takes on the appearance of a "grainy snowball thrown against a pane of glass", always on the brink of being resolved but never quite making it, except when averted vision is employed. In the 10-inch scope (at 133x magnification with a 9mm Nagler eyepiece) it was transformed into a vast three-dimensional city of stars, its brighter members glinting like crushed diamonds right across the face of the cluster, with hundreds - perhaps thousands - more revealing themselves in averted vision. The longer I looked, the more impressive it became, as I began to discern chains of stars arcing out from the centre.

M13 is arguably the most spectacular globular cluster visible from UK latitudes, but there are several others which run it close, such as M3 in the constellation Canes Venatici:

Messier 3
M3, Tele Vue-60 + Canon 80D (31 x 1 min @ ISO 800)

Of course, acquiring the images is only half the battle; processing them is an art-form in itself. I'll leave those details for another time as I'm still very much a beginner at this, but if you want to know what software I used, the links are here.

In the meantime, if you ever get the opportunity to look at M13 or any of the other showpiece globulars through a medium to large-sized telescope, I strongly recommend it. Drink in the spectacle, contemplate what you're seeing, and then look at it again. Photographs just can't do it justice.

See more of my TV-60 deep-sky photos on Flickr.


*Famous last words... While I was drafting this post, He-Who-Must-Not-Be-Retweeted announced the creation of SPACE FORCE (I swear I can hear the echo as I'm typing it). It seems there really is no escape from the Tangerine Nightmare.

Sunday, 13 May 2018

Birds of East Kent: Kestrel

Latest in an occasional series of posts discussing the different birds that can be found in East Kent and how easy (or not) it is to get a decent picture of them.

Kestrel (Falco tinnunculus)

I don't usually bother with top-ten lists or stuff like that, but if I had to choose a favourite bird it would undoubtedly be the Kestrel. It's not the biggest (or smallest) bird of prey; nor is it the most colourful. It's not even the only British bird that hovers, though the other contenders can't hope to match its precision or its tenacity. But, more than any other bird, it's always been a small part of my life in some shape or form. It was there on the striking red badge I received when I joined the YOC:


It was there in Ken Loach's famous film (adapted from the novel by Barry Hines) that I saw in my early teens. And it was there at the start and end of the summer holidays, glimpsed from the side window of a car; a bird that seemed to defy not just gravity but time itself as it hovered above the roadside verges while the twentieth century flowed around it.

Kestrel (Falco tinnunculus)

I've had the privilege of seeing a wild kestrel up close on a couple of occasions, most recently in February of this year when I encountered one perched in a small tree by the North Foreland golf course. I took some photos and continued on to Botany Bay to see if there was anything interesting on the shore. When I turned around to walk back I was surprised to see the same kestrel standing on a fence post. Naturally, I couldn't pass up the opportunity to take some more photos:

Kestrel (Falco tinnunculus)

From badges to films to poetry (see: The Windhover by Gerard Manley Hopkins) there is something about the kestrel that seems ingrained in the British psyche. A good example of this can be found in Powell and Pressburger's 1944 wartime classic A Canterbury Tale. In the film's prologue, a group of medieval pilgrims make their way towards Canterbury while a voiceover narrates a passage from Chaucer's text. A falconer stops to release a kestrel into the sky. The bird dips and soars ... and transforms into a Spitfire flying above the English countryside. Four hundred years of history spanned in a single cut.


If the description of that scene rings a bell it's because Stanley Kubrick used the same trick in the famous bone-to-spacecraft transition in 2001: A Space Odyssey. Coincidence, homage or blatant rip-off? It's a question that's been debated for fifty years, and will probably be debated for fifty more. In the meantime, the kestrel continues to soar above fields, along cliff-tops, and across marshes - hovering, observing, sometimes descending for prey, and then moving on, seeing colours that no human eye can see as it patiently constructs its daily map of the world.

Effortlessly at height hangs his still eye.
His wings hold all creation in a weightless quiet,
Steady as a hallucination in the streaming air. 
Ted Hughes, The Hawk in the Rain (1957)


See also:
More of my Kestrel photos on Flickr
Kestrel (RSPB)
Kestrel (Birdforum)
Kestrel (Birdguides)

Sunday, 24 December 2017

2017 in Pictures

I normally leave end-of-year round-ups to the more prolific bloggers, but this year I've taken a lot more photos that usual, partly because I bought a new camera, and also to serve as a welcome distraction from the daily hourly news maelstrom generated by Brexit and He-Who-Must-Not-Be-Retweeted. It's reassuring to know that there are still some quiet corners of the world where wagtails still wag, kingfishers still fish, and kestrels still hover, unconcerned by the sound and fury of angry old men who never stop to listen.

But enough of all that; here are some highlights.

January
Photographers often rhapsodise about the "golden hour" just before sunset, and it doesn't get much more golden than this:

White on Gold

February
A Water Rail breaks from cover at Grove Ferry:

Water Rail (Rallus aquaticus)

March
This colourful Pheasant took it upon himself to greet visitors to the Stodmarsh car park:

Pheasant (Phasianus colchicus) 

April
A smart Shelduck flies overhead at North Foreland:

Shelduck (Tadorna tadorna)

May
A dull and drizzly May Day at Grove Ferry was livened up by this magnificent Kingfisher (one dive, one fish caught, one lucky photographer):

Dive!

Later in the month, a decent view (for a change) of a Cuckoo:

Cuckoo (Cuculus canorus)

June
The dragonflies at Grove Ferry / Stodmarsh attracted lots of visitors, including this dashing Red-footed Falcon:

Red-footed Falcon (Falco vespertinus)

July
Fortunately there were still plenty of dragonflies left after the Red-footed Falcon departed, including this Norfolk Hawker (aka the Green-eyed Hawker):

Norfolk Hawker (Aeshna isoceles)

August
Lots to see in North Yorkshire, including Red Grouse:

Red Grouse (Lagopus lagopus)

...and the famous Gannets of Bempton Cliffs:

The Gannets of Bempton Cliffs

Back in Kent, a relative newcomer to Grove Ferry, a Willow Emerald Damselfly:

Willow Emerald Damselfly

September
Some drastic Photoshopping saved this image from the bin. The Marsh Harrier changed direction so suddenly I cut off half of the upper wing and had to clone it from the other one. I wouldn't normally do this much work to an image, but I think in this case it was worth it:

Marsh Harrier

October
Fortunately my reflexes were a little better when this Kestrel made a quick getaway:

Flight of the Kestrel

November
After seeing a Red-throated Diver in 2014 and a Great Northern Diver in 2015, I wondered how many years I'd have to wait to see a Black-throated Diver in Ramsgate Harbour. Turns out it was only two:

Black-throated Diver (Gavia arctica)

December
Another new visitor to Ramsgate Harbour, an Iceland Gull:

Iceland Gull (Larus glaucoides)

The year started with a Little Egret against a golden backdrop, so it seems fitting to end it with its larger cousin, a Great White Egret, looking for fish in front of the golden reeds of Grove Ferry:

Great White on Gold


No autofocus was used in the making of these pictures.

Saturday, 28 October 2017

Shooting with the Canon 80D

Kingfisher (Alcedo atthis)
Canon 80D & Tele Vue 60 refractor, 1/1250 sec, ISO 640

I tend to steer clear of technical write-ups on this blog as the Internet is already stuffed with photographers telling you all about what their camera can do rather than what they've actually done with it. However, given that the bulk of the traffic to my Flickr pages this year has been driven by people specifically looking for photos taken with the Canon 80D, I thought I'd share my impressions after several months of shooting with it. Please bear in mind that this is all very subjective and I can only compare the 80D against other Canon DSLRs I've used (namely the 350D, 40D and the 7D Mark I).

Noise-handling is significantly improved over the 7D Mk I. Tastes vary of course (I don't mind a little grain as long it doesn't look too obviously "digital" - and I actually prefer it to the over-aggressive noise reduction that some photographers insist on), but I find the 80D gives exceptionally clean images up to ISO 400, and stays workably clean all the way up to ISO 3200. The image below was taken in very gloomy conditions at ISO 3200, but I was still able to get a good 12x8 print out of it.

Coot Chicks
Canon 80D & Tele Vue 60 refractor, 1/1250 sec, ISO 3200

From ISO 4000 the noise gets progressively more obtrusive, but still manageable (as demonstrated in this shot of a black cat, taken in poor light at ISO 5000 and downscaled to 12x8). Even at the highest ISOs the 80D's large pixel count means that you should be able to get an acceptable 6x4 print provided you don't have to crop too much.

The 80D's default colour setting seems slightly desaturated compared to previous models, but this can be easily fine-tuned in-camera or in post. The "Peacock Butterfly" test certainly produces reds that look closer to nature than the over-saturated reds of older Canon DSLRs.

I use manual focus for most of my wildlife photography so I can't really contribute anything to the 80D vs. 7D Mk II autofocus debate, but on the occasions I've used the touchscreen focus I've found it to be fast, responsive and very intuitive to use. If, like me, you plan to use your camera for astrophotography now and then, you might consider the 80D's articulated touchscreen to be a more valuable feature than the 7D Mark II's advanced tracking.

Birds-in-flight are always going to be a challenge using manual focus, but so far I've found that my hit-rate is better than with any previous Canon DSLR. Would autofocus have successfully tracked this tern or would it have zeroed in on the coots in the background?

Tern (with fish)
Canon 80D & Tele Vue 60 refractor, 1/1600 sec, ISO 400

Much has been made of the 80D's improved dynamic range at lower ISOs, and you'll find plenty of examples online where photos have been deliberately underexposed by an extreme number of stops and then fixed in Lightroom/Photoshop to demonstrate the camera's capacity for shadow recovery. In real-world terms you'd have to be doing something drastically wrong to underexpose a photo by that much without realising (and the metering is almost always spot-on - more so than any other camera I've used), but the improved DR does give you scope to be more adventurous in your post-processing, especially when trying to emphasise a particular mood. See this black-and-white shot of Whitby Abbey below for an example (move your cursor across the image to toggle the before-and-after):

Canon 80D + EF50mm f/1.8; 1/250 sec, f/8.0, ISO 125

I'm struggling to think of anything I don't like about the 80D: I miss the mini-thumbstick from the 40D and the 7D, but the touchscreen makes up for this. Overall the Canon 80D is a user-friendly and feature-packed camera (including settings for time-lapse, multi-exposure, minimum shutter speed, flicker detection, and so on) that does everything I would want from a DSLR.


See also:
More of my photos taken with the Canon 80D


Monday, 8 May 2017

Answer: "It's a Tele Vue."

Pheasant (Phasianus colchicus)

The question being, typically: "What's that on the end of your camera?"

As the name of this blog suggests, I do most of my photography with a telescope - a Tele Vue-60 refractor to be precise. What it lacks in autofocus and aperture control it more than makes up for in sharpness and colour correction. It's compact and portable and it doesn't need to be stopped down to hit the sharpness sweet spot. Recently Tele Vue embraced the world of social media and - as part of their ongoing 40th anniversary celebration - they asked if they could feature me on their new blog, in particular why I chose the TV60 and why I've stuck with it over the years. You can read the resulting post here:

http://televue.com/notamnomen/2017/05/02/tele-vue-is-for-the-birds/#.WRC_XNQrL4Y

Three scopes in one: astro-scope, spotting scope and telephoto lens

Astronomers of course need no introduction to Tele Vue, but for those who don't know, they're a Chester, New York-based company founded in 1977 by Al Nagler. Prior to that Al designed lunar landing simulators for the Apollo missions, using his knowledge of optics to create realistic wide-field vistas to aid the astronauts' training.

Tele Vue started out making lenses for large projection-screen televisions, but they've since become renowned for their high-quality eyepieces and telescopes. If you ever get the chance to look through one of Tele Vue's wide-field eyepieces, I highly recommend it. They call it the "spacewalk" experience and with good reason: if, like me, you started out in astronomy squinting through a cheap and cheerful 0.965" eyepiece, the difference is startling. When looking through a Nagler it's as if the eyepiece "gets out of the way", leaving you immersed in the stars (or suspended above the moon if lunar observing is your thing). And if the 82-degree apparent field-of-view of a Nagler isn't enough for you, they also do an Ethos range, which goes up to a whopping 100 degrees.

In the interests of fairness and transparency I should point out that:

a) Other telescopes and eyepieces are available
b) I was not offered any incentive by Tele Vue (financial or otherwise) to contribute to their blog or write this post. I'm just a proud TV-60 owner and I wouldn't dream of parting with it.

See also:
Tele Vue home page
My TV-60 photos on Flickr

Sunday, 8 January 2017

A few thoughts on Google's Nik Collection

Back in March, Google made the entire Nik Collection photo-editing suite available as a free download. Despite my initial scepticism (and wariness of filters that claim to replicate the "look" of film), I have to admit - now that I've been using it for a few months - it is actually really good and serves as a helpful complement to Photoshop. The Control Point technology is particularly useful for carrying out localised enhancements, saving a lot of time compared to manually creating masks.

Selective sharpening using colour range masking

Of course, no amount of software wizardry can turn a bad photo into a good photo, but with a little care you can get some interesting results, as shown below. (Note: my photo-editing steps are usually a lot more subtle than this. I provide these photos as examples because it's easier to see the difference.)

Move your mouse across the images to see them as they appeared before processing. Most of these results were achieved using Color Efex Pro, but the first image (the helicopter over the house) was enhanced using Silver Efex Pro to create a High Dynamic black-and-white luminosity layer.

Helicopter at North Foreland, April 2016 

Stodmarsh Hobby, May 2016

Bright Wake on a Dark Sea, November 2016

Common Tern, May 2016

Stodmarsh NNR, June 2016

The complete Google Nik Collection suite is available at:
https://www.google.com/nikcollection/
It works best as a Photoshop plugin (under the Filter menu), but you can also run each application as a standalone program if you create short-cuts to the individual .exe files.


Saturday, 10 December 2016

Birds of Ramsgate Harbour

Given that one of the attractions of going out with the camera is to escape from the hustle and bustle of everyday life, a busy harbour wouldn't normally be my first choice of destination. However, a visit to Ramsgate during the winter months may occasionally provide close-up views of certain sea-bird species which, while not being particularly rare, are more usually seen as distant specks flying above the waves.

Afloat 

This Red-throated Diver, photographed in November 2014, visited Ramsgate at a time when the harbour was getting a bit of a reputation for being a Diver graveyard. It wasn't feeding and the only time I saw it do anything other than float listlessly was when it was being harassed by a seal.

Great Northern Diver (Gavia immer) 

The R-TD eventually disappeared (almost certainly perished), but this Great Northern Diver, which arrived at Ramsgate the following winter, was in a much healthier condition. During its long residence it demonstrated that the harbour is home to a surprising variety of fish and crabs (at least, it was until the Diver ate them).

Eider (Somateria mollissima) 

This female Eider (a sturdy sea-duck usually seen bobbing up and down a long way offshore) visited the harbour in January 2016. It paddled in, spent about half an hour looking around, diving, and flapping its wings, and then it paddled out again. Fortunately I happened to be in the right place at the right time (for once).

Shag (Phalacrocorax aristotelis) 

Although you can't see it from this angle, this Shag, photographed in November 2016, is sporting a blue colour ring (letters AUR). As reported by Scott Haughie, it was ringed on Staple Island up in the Farnes in June and made its way south to Ramsgate (other sightings from the scheme have been in Holland).

Guillemot (Uria aalge)

The Collins Guide says of auks: "Most commonly seen at coasts during and after gales", and so it proved with this little Guillemot, which took shelter in the harbour after Storm Angus had swept through the Channel.

Sea-going species aren't the only birds that make Ramsgate their home during winter. If you're lucky you may spot one of the local kingfishers, as documented by Keith Ross.

See also:
More of my photos from Ramsgate Harbour (Flickr)
Keith Ross's Video Channel (YouTube)