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Ken
Here’s a close up image of the Carina Nebula ( featuring the Keyhole Nebula and Eta Carina Star ) captured in March with my 8” f5 newt , Canon 600D with a 2 x Powermate ( newt has a focal length of 1000mm and with Powermate is effectively 2000mm ) 32 x 5 minute exposures
Stacked in DSS , processed in Startools
You do lose a great deal of detail as soon as you increase focal length at the same aperture
This was an experiment to see if I could image DSO’s with a Powermate and achieve reasonable results, which seemed to work out ok ( however Carina is a bright object at mag 3.5 ) Considering the quantum efficiency of my Canon 600D is 40% and my new ZWOASI2600MC has a QE of over 80% , I’m going to experiment on some galaxies and other objects in the near future in my new obs when’s it’s finished in March at my dark site. I’ll be using my 8” f5, a 2 x Powermate and the new ZWO camera capturing plenty of 5min subs and hopefully see if I can process some decent images out of it all.
Cheers
Martin
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