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07/10/2004 10:30:37 PM · #1 |
| has anyone ever used a rubinar catadioptric lens? i've seen a few pictures taken with them for astrophotography, and they were....impressive. more like a telescope than a lens, made in russia. curious if anyone has ever hooked one of these monsters up to their dslr, and if so...how'd it do. its fully manual of course and needs an adaptor...only about $200 for a 1000mm. wondering if its worth buying. |
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07/11/2004 06:24:38 AM · #2 |
For certain applications, maybe not so bad. For others, you might be disappointed. You will have relatively low contrast, as well as the classic annular (donut-shaped) bokeh on OOF highlights. You'll also be very limted in when you can use the lens; it's very slow of course, and at 1000mm you'll need a very steady tripod or very fast shutter to avoid motion blur.
There may also be a mechanical problem with the 1000mm Rubinar on the 10D; I seem to remember reading that this lens can't be mounted on the 10D because of interference of the large lens barrel with the forward-projecting flash housing on the 10D. I think the 500mm fits, but don't quote me.
An alternative to this lens is to get a Celestron C5 spotting scope and a t-adapter, giving 1270mm @ f/10. The optics are much better, and you can use a 0.63x focal reduer/field flattener to get 800mm @ f/6.3 as well. A much more versatile piece of glass, but more expensive as well.
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