Last week my Canon lens-to-SBIG ST8300M adapter arrived. Beautifully machined, it is. Expensive, it is! I tried it out with my 50mm f/1.8 and 17-70mm f 2.8-f4.5 zoom lenses. Images showed nice stars at the center of the fields, but progressive defocus toward the edges. I should not have expected anything different, since I had the lenses wide open.
How does one stop down a fully automatic Canon lens? Turns out it's easy, just follow these instructions. They work for me. My thanks to Haje Jan Kamps for posting them at pixiq!
Now if it would clear up for one night I could test the improvement.
I also upgraded to ImagesPlus 4.5, but am having a little trouble getting my old serial number to complete the registration. The always-helpful Mike Unsold, creator of IP, is on the case, so I should be up and running soon.
Showing posts with label EOS lens. Show all posts
Showing posts with label EOS lens. Show all posts
Friday, May 25, 2012
Monday, February 27, 2012
Wide-Field Imaging with EOS Lenses
I would like to do some very wide field imaging, in which I can capture entire constellations or significant parts of them. This means imaging with focal lengths less than 200 mm, which can be done with camera lenses. I have a few Canon EOS lenses, and lenses that can be adapted to work as if an EOS lens, but the problem is mating the lenses to my SBIG CCD.
A search of internet forums suggests that there's only one way to do this: With an SBIG EOS to ST-8300 adapter ring. The problem is that this adapter is pricey: $295 + shipping. A Wanted ad on Cloudy Nights failed to produce someone willing to sell a used one, so yesterday I faced reality and ordered one from Oceanside. I should say, back-ordered it. With luck it will be here for the warmer weather expected to arrive in April.
Update 2/27: OPT wrote that the adapter would be delivered no earlier than late April! Tomorrow I'll call around to see if any other dealers have it in stock.
Update 2/28: Oh, well. It seems that SBIG items are usually special order most places and are fulfilled in 30 to 60 days. I'll stick with OPT.
A search of internet forums suggests that there's only one way to do this: With an SBIG EOS to ST-8300 adapter ring. The problem is that this adapter is pricey: $295 + shipping. A Wanted ad on Cloudy Nights failed to produce someone willing to sell a used one, so yesterday I faced reality and ordered one from Oceanside. I should say, back-ordered it. With luck it will be here for the warmer weather expected to arrive in April.
Update 2/27: OPT wrote that the adapter would be delivered no earlier than late April! Tomorrow I'll call around to see if any other dealers have it in stock.
Update 2/28: Oh, well. It seems that SBIG items are usually special order most places and are fulfilled in 30 to 60 days. I'll stick with OPT.
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