Quote:
Originally Posted by raymo
Good try Krypt0, A few observations and pointers if I may.
Firstly, your stars are hugely elongated; to get round stars with the polar alignment accuracy you had for this image, 90 secs was far too long, 30-40
would have been more like it.
There is a method of drift alignment that will get you accuracy as good as you want it. It is called DARV drift alignment, just google it and print out the
instructions. The first time you try it you will probably mess about for an hour or so, but it will quickly become second nature. If you mark the ground where your tripod legs sit, the alignment won't take long at all once you are familiar
with the procedure. There are other methods, but this is free and not
difficult to learn.
Most guys with DSLRs use the ISO sweet spot for their specific camera,
which in most cases is somewhere between 800 and 1600. At ISO 250
especially with your slow lens [f/6.3] you would need very long exposures
[subs] to get much colour and detail, and they would need to be guided,
not just tracked.
Thats enough to be going on with, happy snapping.
raymo
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Hi Raymo,
Thanks a lot for the feedback!
Agree I can certainly see that, this is also just a crop of a 30MP image so when looking at this 1:1 I can certainly see the trailing.
I tried DARV during my first try with my mount and I really struggled to make this work after spending 6 hours outside, however APT has a DARV tool built in so I'll certainly try this next time. I also had some really good advice from some other members after my first night.
I've bit the bullet and ordered a PoleMaster and adapter ring from Sidereal trading in Tullamarine, VIC, so I'm hoping to take so much of the struggle of PA.
I'll certainly work on the ISO recommendations, I believe for my camera its above 800 as you say, I'll work on lower exposure times and higher ISO and higher number of images.
Thanks again!
-Adri-