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This is an interesting setup for widefield astrophotography. It is a Rubinar 4.5/300 telephoto lens engaged to a CCD camera. Usually we find telephoto lenses on SLR cameras or DSLR. But it is also possible to use a CCD camera with the lens as a way to save some costs (avoiding to buy a DSLR body) and getting other advantages from the CCD detector.

Zoran Belobrajic is the author of this image and has been using this astrophotography gear with good results. Congratulations!

2012-10-07 20:52:03       
Hi Jerry, Nice to see your review of this fine lens. I was lucky to pick up a good salmpe of one of these and am a big fan of it. A few people have been recommending it on forums recently (myself included) so it's nice to have another test to point people to. It is definitely a great bargain. However, your pricing for the Tak FS-60CB is way off. Buying new in Japan, I can get an FS-60CB with the RD0.72C reducer and required adapters for about 1000USD. Anacortes has the FS-60CB at 845USD, but they don't list the reducer. Based on the price in Japan it should be 350-400USD in the States. The native focal length is 355, and 255 with the focal reducer.Another option is the Borg 60ED. This has a native focal length of 350mm that goes all the way down to 230mm (f/3.8) with the 0.66x DGT reducer. I have this set up, and it is much better than the 180/2.8 ED AI-S @ f/4 for OSC. The field is very flat, with no colour and nice round stars to the edge of an APS frame.I think both the FS-60CB and Borg with reducers are optimised for APS sized senors (certainly the Borg is), and will start to show problems on a full frame sensor. But in this regard, the 60ED already easily outperforms the 180/2.8 on an APS sized sensor, so I'd expect it to do so on a 35mm full-frame, though I've not done the comparison.So, you can get similar focal lengths with little apos and they will perform better at f/4, but at a cost. The apos still wont wont go to 2.8, though. I consider the 180/2.8 usable wide open, others prefer to step it down to f/4. Either way it's a bargain. It's also a nice lens for wide-field H-alpha wide open.
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