Finally, I got a 500 mm lens for larger objects (with my 200/1000 Newtonian and no coma corrector, you can't really capture extended deep-sky objects). The f/6.3 aperture, of course, requires much longer exposure times to gather enough signal. Here is the result of two nights—I could have managed it in one, but the mount performs poorly near the zenith, resulting in a lot of rejected frames.
Наконец приобрел объектив 500 мм для более протяженных объектов ( на мой Ньютон 200/1000 да ещё и без комакорректора протяженные дипскаи не поснимаешь). Диафрагма 6.3, конечно, вынуждает копить сиг...
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