1. The TSN-773 is much lighter
2. it is much more compact
3. its has a very good dual-focus mechanism
4. there is a state-of-the-art zoom-ep available.
I'd agree with all four of those...
I think the only way you could get a better Kowa scope would be to break the bank and go for the 883!
I'm currently trying to work out some method of syphoning the necessary dosh out of the bank account without a certain little lady noticing it.
Kimmo,The 823's zoom has a narrower field of view, somewhat less good edge performance and significantly less eye-relief, but if you don't need the eye-relief, it gives a very fine image.
IWith an photoadapter ( i have a EOS350D), 823M model gives 850mm and the 773M is (650-1000mm), if the diameter is less, why the focal distance is better for the new model ?
Peter,I've not heard that the 823 has a "real objective fluirite", as far as I know the 883/4 are the only big Kowa big scopes that have this