Originally posted by Canada_Rockies Darn it, those photos are so good I'm getting LBA for an 8 inch newtonian ...
Now that I know what "LBA" is I must say that I could resist up to now
. I started doing astrophotos because I wanted to find out how far I could get with "normal" DSLR and lens equipment. That was 14 month and 20 starry nights ago. I have bought old prime lenses for small money in the internet meanwhile.
My actual pictures are shot with a 400 mm lens from the 1980ies, not with an 8" Newtonien Telecope
---------- Post added 12-20-15 at 10:14 ----------
Originally posted by bhairavp Lens Buying Addiction
Thank you for the info. LBA tries to grab me always around Christmas....
---------- Post added 12-20-15 at 10:27 ----------
Originally posted by Kerrowdown Certainly interesting imagery you've been posting of the universe recently, something I have never been called on to do, so I know nothing of the techniques deployed here.
Am I reading this right... this image was in fact made up of 123 separate 30 second exposures and then combined with software?
If so how do you meter for such an exposure? or is it trial and error.
You are right: 123 pics (best out of 190 or so) shot from my balcony.But it is not trial and error. It is catching as many photons as possible at the lowest possible ISO without exceeding the exposure time so long that you get trailing stars. Stacking the series brings down the noise and increases dynamic range. I shoot series of as many pics as possible using a remote timer control in bulb mode. There is actually a discussion in the Astrophotograpy group on this topic.
https://www.pentaxforums.com/forums/groups/135-astrophotography/4340-how-avoi...high-isos.html
Last edited by Pete_XL; 12-20-2015 at 02:30 AM.