www.astrocafe.hk

視寧度極差的情況下用Skywatcher Equinox 120和Lunt CaK module拍攝的拼圖，我估用APM 80/480和DMK41單張的效果差不多。

還是Equinox的紫光修正度只是很一般？

David 寫:視寧度極差的情況下用

相信在這情況下，APM 480/80也不會比APM 80/480好，是否Equinox已無關係　

视宁度差真的用什么镜都一样了。

No，但視寧不好時，我用203APO瞄這裡瞄那裡，自己也不知在看什麼時，自我感覺仍是十分良好的

universe24 寫:视宁度差真的用什么镜都一样了。

Actually, it is worse to use a long focal length scope as the overlapping areas between sub-frames don't fit. With smaller scope, there is no need to stitch.

All this time, I prefer not to do stitching on solar images. Because the features on the Sun changing all the time. Although sometime only slight change but in certain senses, it do changed.
The only way to deal with this is to use a bigger chip w/ high frame rate or use a shorter focal length as you mentioned.

I have DMK51 on the way to Hong Kong. But for longer focal length like this,

viewtopic.php?f=10&t=2977

you need a bigger chip like this, a 36x36mm chip can handle full disk image from system of 4000mm effective focal length.

viewtopic.php?f=29&t=2884

let me know if you need any of these, FLI, Lunt, Imaging Source......

Galaxy Scientific Group is the dealer nearest to you and more than happy to serve you "星河是你好朋友"

The image is not too bad. Let me try my CaK when sunny days come.