Quote:
Originally Posted by EricB
Thanks Stuart.
Re tracking, I usually track manually (using the synscan hand controller). After a bit of practice is quite easy for panoramic shots, a bit more difficult for close-up shots where there is going to be quite a lot of movement because of the high magnification (ASI + 2.5 powermate). In that case I only capture 200 or 300 frames. AutoStacker 2 allows me to get rid of frames that have deviated too much from the reference point. So I compensate that way. I know this is not ideal and I should really set up my dobs properly for tracking. With perfect tracking I could possibly improve my shots a bit. The ASI beats the DMK41 on planets because of the higher frame-rate.
Re ASI120MM vs DMK41, it's difficult to say I have more experience using the DMK and as, I believe, I haven't yet used the ASI in optimal conditions. I think they performance is fairly similar. However, the ASI gives a softer texture to the captures than the DMK. I have attached 2 images of Sinus Iridum taken during te same session for comparison. The first one is with the ASI the second one is with the DMK. I had to down-scale the DMK picture so that the scale of both pictures would be comparable (loss of quality compared with the original TIF format in both cases).
Cheers,
Eric
|
Interesting to hear you don't activate the tracking Eric. I guess you are running 100+fps with the ASI so only need a few secs of capture? I've recently got the QHY5L-ll mono which has the same chip as asi120mm and hope to take advantage of its larger fov compared to my dfk 21. Unfortunately my 5x powermate is producing f40ish with the QHY so looks like I will be using 3x barlow instead.
For sure AS!2 is great for aligning shifting images compared to registax which for me has proven a disaster with the Dob tracking.
Have you tried any Planetary imaging?