Inspired by the picture of
@Rolf Dietrich I wanted to try the gecko riding the Ha cloud.
I wanted a slightly wider fov than my triplet refractor can provide, so I went for my Canon 70-200mm f4.0 lens @200mm. I have never tested this for astro previously.
I stacked all sessions in one tiff file and post processed in PS. The stars are from the session of just uv-ir cut filter when I stopped my lens down to 6.7 using rings instead of the internal blades in the lens. Guiding was quite good. But my under sampled image scale of 4.4 combined with performance of my lens of the bright stars doesn't give me perfect round stars, rather a 'trapez'-like shape. But at 'normal' viewing distance and not pixel peeping, I find them 'acceptable' for the cheap second-hand lens.
Maybe it would be better to stack the sessions according to which filter separately, and then combine in post, instead of stacking all sessions, all filters in to the same file for post-processing. Any thoughts on which way is better...?
I found the Ha cloud quite faint and hard to process without creating a lot of noise. the dust was actually much easier to bring out.
Anyway, my deepest integration to this date. Rejecting about 10-15 frames, total integration ended up just north of 32 hours.
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