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Joined: Fri Apr 10, 2009 12:22 pm Posts: 25 Location: Colorado Rockies |
 Some bird shots with an 820mm FL astro telescopeI had an idea to try something different - see if I can use one of my astro scopes (a Takahashi FS102) with my 40D as an 820mm F/8 telephoto. I mounted the scope clumsily on a Celestron NexStar 5SE mount. Since the scope doesn't have autofocus, I had to use the 40D's live focus. I pointed the scope at a birdfeeder about 50 feet away and had at it.
Mountain Chickadee Pygmy Nuthatch Pine Sisken Woodpecker Woodpecker Scope & camera _________________ http://deanrowe.net/astro |
| Mon Jun 01, 2009 6:24 pm |
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 Joined: Fri Apr 03, 2009 6:15 pm Posts: 832 Location: Middle Earth |
Re: Some bird shots with an 820mm FL astro telescope 820mm, does that include the crop factor? They look sharp but what about at full res?
_________________ Cloud hidden, whereabouts unknown …....YouTube channel 360timeimages Canon 5D MkII, Canon 50D, EF 15 f/2.8 Fisheye, EF 24-105 f/4 L, Nikon 50mm f/1.8 AF-D, EF 100 f/2.8 Macro, EF 300 f/4 L, PClix, |
| Sat Jun 06, 2009 1:58 am |
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Joined: Fri Apr 10, 2009 12:22 pm Posts: 25 Location: Colorado Rockies |
Re: Some bird shots with an 820mm FL astro telescope unozig wrote: 820mm, does that include the crop factor? They look sharp but what about at full res? 820mm if the FL of the lens, no crop factor. The nuthatch, chickadee, sisken and 2nd woodpecker are full res crops, the 1st woodpecker is uncropped, but not full res. _________________ http://deanrowe.net/astro |
| Sat Jun 06, 2009 7:18 am |
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 Joined: Wed Jul 09, 2008 11:54 pm Posts: 888 Location: Aars, Denmark |
Re: Some bird shots with an 820mm FL astro telescope They are impressively sharp. Something these photos illustrate is the influence lenses have on colors - obviously, color fidelity wasn't the main priority when designing this one.
 _________________ Nikon D3s, D600, Canon 5D II, S3, SX100. Feature film Beneath the Aurora on Vimeo. |
| Sat Jun 06, 2009 7:54 am |
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Joined: Fri Apr 10, 2009 12:22 pm Posts: 25 Location: Colorado Rockies |
Re: Some bird shots with an 820mm FL astro telescope flyvholm wrote: They are impressively sharp. Something these photos illustrate is the influence lenses have on colors - obviously, color fidelity wasn't the main priority when designing this one. These were shot on a very overcast day and whatever color temp. the camera decided, so I'm not so sure these are a very good indication of the color fidelity of the lens. That said, it was designed as an astronomical scope and not as a telephoto lens for terrestrial photography, so it wouldn't surprise me if color fidelity was very low priority. _________________ http://deanrowe.net/astro |
| Sat Jun 06, 2009 8:44 am |
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Joined: Wed Jul 09, 2008 11:54 pm Posts: 888 Location: Aars, Denmark |
Re: Some bird shots with an 820mm FL astro telescope Dean wrote: it was designed as an astronomical scope and not as a telephoto lens for terrestrial photography, so it wouldn't surprise me if color fidelity was very low priority. Exactly - it wasn't meant as a criticism of the telescope or the photos. Dean wrote: whatever color temp. the camera decided Can you check exif for white balance? The uploaded photos have no exif. _________________ Nikon D3s, D600, Canon 5D II, S3, SX100. Feature film Beneath the Aurora on Vimeo. |
| Sat Jun 06, 2009 11:25 pm |
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