Hi, my question was not so much a 925 hd v 800 hd, but a 925 normal xlt with a field flattener (added), v the 800HD with it built in.
And I have already read the white paper, celestron still states the 800hd will give a 42mm circle, same as the others? as you say the baffle in the end is only 38mm, however this wont change the final image area. Many DSLR lenses have small final elements still with the ability to spread the light across a 36mm frame, the ff in the edge models is in the baffle at the end doing the same thing is it not?
<my interests, well everything really, presently I have only imaged; Carina Nebula, Orion Nebula, Jupiter, The moon and the general milky way including more condensed views of constellations. The telescope will be primarily for deep field, as I have lenses to fill every point up to 1600mm.
Thanks- Leon
