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Kowa TSN663 vs. Kowa TSN771

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Kowa TSN663 vs. Kowa TSN771

Postby mikejh on Sat Jan 02, 2010 11:25 am

These two scopes with are relatively similar in price, with 20-60 Z9B eyepiece on the TSN663 and 25X eyepiece on the TSN771. TSN663 is ED vs. the non-ED 771. 66mm objective vs. 77mm objective. How do these scopes compare in performance in 1) low light, 2) for digiscoping, and 3) general wildlife viewing (large animals and not specifically birding). What is your recommendation?
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Re: Kowa TSN663 vs. Kowa TSN771

Postby Jne_K on Mon Jan 04, 2010 9:06 am

Hi

Basic law of optics - all else equal, and we are pretty close on these, is that the larger objective is going to get you more image brightness and also a touch more resolution, although the ED on the 663 will make up for some of that.

For general wildlife viewing, either is an excellent choice, but, keep in mind, that much wildlife observation is early and late in the day. The 771 will do a better job in low light.

For digiscoping, though, that ED is a big plus and the 663 will take better pics than the 771, assuming you have enough light to work with in the first place. Keep in mind, though, that photography with any spotting scope is quite limited in low light. If you are serious about wildlife photography and that will sooner or later mean low light photography, your money is best invested in serious SLR/DSLR camera equipment and big long expensive telephoto lenses.
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