New EXOS-2/PMC-8, need advice on tracking [1 Attachment]
The progress shown by these photos is most encouraging, and I appreciate you keeping us informed.
Jerry is the expert, but FWIW, some comments:
At 06:20 13-12-17, r_hoskin@... [ESPMC-Eight] wrote:
Here's a selection from tonight's images. No seagulls, but still some problems. Thanks for any assistance!
DSC_0193_017.jpg is a 5 minute star trail. The mount's off. Trails are fairly smooth this time, although some trails are individually perturbed briefly. Seeing, perhaps?Much improved!
DSC_0177_018.jpg is a 10-second tracked shot. Round (fuzzy) stars.Focus?
DSC_0214_019.jpg, DSC_0215_020, DSC_216_021.jpg are a series of 3 60-second images in a row. Notice that a) the stars change shape, and b) the image shifts slightly from shot to shot.It seems to me that you should eliminate the polar alignment problem first and then see what is left.
The star shape variations from shot to shot are interesting. Opinions?It looks to me that the fainter stars are showing consistent shapes, which is good.
How do you do your polar alignment? With ES only? If so, why not have several runs, using different stars? I have a Polemaster, which makes it easy. I read that Sharpcap http://www.sharpcap.co.uk/sharpcap/polar-alignment is quicker and it seems to be the method of choice at present; but I dont think it would work with your camera. One way or another, mastery of PA is essential for the photos you want ot take.
Keep at it in the bracing weather you have -- it is cold here, but the skies are totally overcast, day and night!