Search found 22 matches

by KEJ
Sat Oct 10, 2020 5:44 pm
Forum: Deep Sky Imaging
Topic: Brain and unity gain or max dynamic range
Replies: 8
Views: 763

Re: Brain and unity gain or max dynamic range

My Gut feeling is to stick a Gain of 100 and potentially just alter the duration of the exposures, depending on the target.

Ie:

Bright targets stick with 48 secs and many exposures.

Faint targets stick with 3 to 5 min exposures, many exposures.

But then its back to the optimum duration..........
by KEJ
Sat Oct 10, 2020 5:42 pm
Forum: ZWO Cameras
Topic: ZWO ASI533 MC Pro - Optimum Exposure Time ?
Replies: 4
Views: 802

Re: ZWO ASI533 MC Pro - Optimum Exposure Time ?

My Gut feeling is to stick a Gain of 100 and potentially just alter the duration of the exposures, depending on the target. Ie: Bright targets stick with 48 secs and many exposures. Faint targets stick with 3 to 5 min exposures, many exposures. But then its back to the optimum duration.......... Als...
by KEJ
Sat Oct 10, 2020 4:28 pm
Forum: Deep Sky Imaging
Topic: Brain and unity gain or max dynamic range
Replies: 8
Views: 763

Re: Brain and unity gain or max dynamic range

Derek/Robin May I ask, I have literally just bought and received my ASI533MC Pro. And I think I am asking a similar question(plus not that experienced). Have you had chance to have a play with your camera yet and any initial findings ? 1) Unity Gain Should I be sticking around Unity Gain and going f...
by KEJ
Sat Oct 10, 2020 2:54 pm
Forum: ZWO Cameras
Topic: ZWO ASI533 MC Pro - Optimum Exposure Time ?
Replies: 4
Views: 802

ZWO ASI533 MC Pro - Optimum Exposure Time ?

Robin hi May I ask you some more questions please regarding the ZWO ASI533MC Pro (Colour Astro Camera - Zero Amp Glow - Cooled Camera). Back to the age old question of optimum exposure time, previously I had got to grips with ISO, but now moving on to Gain. Attached Fig01 spec for ASI533 MC Pro. So,...
by KEJ
Tue Sep 22, 2020 7:06 pm
Forum: Other Cameras
Topic: DSO Astrophotography with CMOS Cameras (Nikon D800 FF & D3300 Crop)
Replies: 10
Views: 764

Re: Deep Sky Astrophotography With CMOS Cameras

Robin Thanks once again for the prompt reply. Quality wise, I think you are 100% correct. The older FF D800 is a brilliant camera, on the other hand the D3300 has crop sensor and gets in closer. I was ultimately, just curious as to the optimum exposure times, I think I am going to rewatch your video...
by KEJ
Tue Sep 22, 2020 11:57 am
Forum: Other Cameras
Topic: DSO Astrophotography with CMOS Cameras (Nikon D800 FF & D3300 Crop)
Replies: 10
Views: 764

Re: Deep Sky Astrophotography With CMOS Cameras

Robin hi

Very quick question, else I will continue looking.

Regarding the revised graph and details I found, would you say judging by the numbers/curve/data and title more of what you would expect?

Thanks
Keith
by KEJ
Mon Sep 21, 2020 3:32 pm
Forum: Other Cameras
Topic: DSO Astrophotography with CMOS Cameras (Nikon D800 FF & D3300 Crop)
Replies: 10
Views: 764

Re: Deep Sky Astrophotography With CMOS Cameras

Revised. Clicking on the graph, yields the electron values, providing I am looking at the correct measures/graph. I took the relevant values before taking a screen print. Again I have doubts, as it it would appear the better camera D800, has shorter times? However, all that said, the cameras were la...
by KEJ
Mon Sep 21, 2020 3:15 pm
Forum: Other Cameras
Topic: DSO Astrophotography with CMOS Cameras (Nikon D800 FF & D3300 Crop)
Replies: 10
Views: 764

Re: Deep Sky Astrophotography With CMOS Cameras

Thank you once again for a prompt reply and explanation of the 20 value. Regarding the results, that was my gut feeling after I did my calculations, just didn't look right and I remember from your talk, something along the lines of if you increase the exposure time by a factor of 100, the noise woul...
by KEJ
Mon Sep 21, 2020 7:46 am
Forum: Other Cameras
Topic: DSO Astrophotography with CMOS Cameras (Nikon D800 FF & D3300 Crop)
Replies: 10
Views: 764

Re: Deep Sky Astrophotography With CMOS Cameras

***************** My Results *************** So looking at my results and graph, I conclude that I might have the wrong graph! It's just based on your initial comments(providing I have the right end of the stick), my numbers are almost/are in reverse of maybe what I expected. Unless I am going Mad o...
by KEJ
Mon Sep 21, 2020 6:26 am
Forum: Other Cameras
Topic: DSO Astrophotography with CMOS Cameras (Nikon D800 FF & D3300 Crop)
Replies: 10
Views: 764

Re: Deep Sky Astrophotography With CMOS Cameras

Robin good morning I must admit, not sure how you manage to answer lots of these questions so quickly - thank you. I think I now have the relevant information for my cameras and I just wanted to run it by you when convenient of course please. The one possible outstanding question was the "20&qu...