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While searching online for a page I had previously visited about the crosshairs in A Cheshire Collimator and how to use them I came across this resource which reading through is very good, this will help a lot of people struggling with collimation.
A clear night sky and lots of free time were a recipe for a satisfying night of observing and imaging with my Mak. My imaging targets were the freshly opposed Uranus and its more distant cousin Neptune. A trick I use to find Uranus is to star hop from Hamal to Sheratan in Aries to Eta Piscium and Omicron Piscium in Pisces. Uranus is just above Omicron. This is a single 2 second exposure at ISO1600:
Neptune was a little trickier to image as I only had the viewfinder on the scope to guide me and Neptune was undetectable through the camera. I had to point the scope in the general area that I knew Neptune was in, using Lambda Aquarii as a guidepost, and I took several test shots to look for familiar star patterns. But, I got it, using a 10 second exposure time at ISO1600:
Had a great night imaging and star chasing, and even saw an Orionid before all was said and done!
Clear skies to all,
Hi, can anyone help with star detection in DSS. I have been getting some good images using my Star Discovery 150p and nikon d5100.
I'm using a 2xbarlow as I know I can't gain prime focus on this OTA and keeping my exposures down to 25secs due to field rotation with it being a Altazimuth mount and this can also be corrected in processing.
The problem I'm having is that when I put everything in to DSS and register the images, it detects hundreds of stars but when I stack them it tells me there's not enough stars and to change the threshold so it can stack more of the images!
The threshold is already set all the way to the left at 2%
I'm using 100 x 25sec exposures iso 1600, 25 x dark @ 25secs iso 1600 and 25 x bias @ 1/4000secs iso 1600
No matter what I do it will only stack the dark, the bias and 1x25secs exposure!
Is there anyone out there that has had similar issues and can shed some light on this please.
By Some Dude With A Mak- Cass
going to start getting into astrophotography soon, looking into good cameras. i have a $400 budget, a celestron sky prodigy 90 mak-cass, and no equipment that would affect which camera i get. thinking about the orion starshoot all-in-one, but not sure yet. remember, price is not a huge concern (i have a scholarship from my school for $1000 a year to spend on educational stuff, its how i got my telescope,) but i would like to keep it under $400 so i have some left for more lenses and some filters later on. the more help the better, thanks!!