Register    Login    Forum    Search    FAQ

Board index » Images » Deepsky Images

Post new topic Reply to topic  [ 2 posts ] 
Author Message
 Post Posted: Wed Nov 01, 2017 9:23 pm 

Joined: Sat May 23, 2015 9:18 am
Posts: 50
Hi Sam,
Hi All, :D

Here is my first image with testing camera ASI 385.

M76 is an interesting target in short exposures because it's not a very bright
planetary nebula and it shows some faint extensions. Moreover a difficult
double-star is visible at the center of nebula.

Here I mixed 5 seconds, 2 seconds, 1.5 seconds, 1 second exposure. Imaging
session includes2 nights (25 and 26 October) but I have fog which cuts a part
of the light. So bad transparency.

I choose 8 bits during capture, not the best idea for sure. I will use 16 bits
mode next time.

The anti-amp glow works fine !

Only a little problem : on the Raw image, a strange phenomenom appears : stars are
saturated but the level is not at 254 as expected for 8 bits mode. It seems that
the dynamic is reduced or cut by a threshold ? Very strange. If gain is lowered, the
levels of saturated stars are also lowered. Please Sam, could you take care of this
problem ? :?:

Newtonian Orion Optics 300 mm F/D 5.3, on EQ-6 Mount

ZWO ASI 385 without filter,
2595 x 5 seconds exposures.
1319 x 2 seconds exposures
2053 x 1.5 seconds exposures
4370 x 1 second exposures

Gain = betwen 37and 400.

Visual sort out of Raw images.
Registration with DSS.
Processing and post-processing with Iris + Photoshop.

Final image, resized at 110% :


5 sec Raw image at 100% :



Reply with quote  
 Post Posted: Sat Nov 04, 2017 5:54 pm 

Joined: Mon Sep 04, 2017 8:09 pm
Posts: 4
That is a beautiful image. But the # of short captures taken is insanely large, requiring huge storage space and processing power. What results can you achieve if you take equivalent total duration, but with 5-10 minute sub-frames?

Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

Board index » Images » Deepsky Images

Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to: