Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  21 Cyg  ·  22 Cyg  ·  25 Cyg  ·  27 Cyg  ·  28 Cyg  ·  29 Cyg  ·  34 Cyg)  ·  36 Cyg  ·  37 Cyg)  ·  37 gam Cyg  ·  40 Cyg  ·  B144  ·  B147  ·  B342  ·  B343  ·  B344  ·  B347  ·  Crescent Nebula  ·  HD188075  ·  HD188149  ·  HD188326  ·  HD188501  ·  HD188591  ·  HD189085  ·  HD189315  ·  HD189432  ·  HD189528  ·  HD189864  ·  HD189918  ·  HD189983  ·  And 1159 more.
Getting plate-solving status, please wait...
Sadr Region and Crescent Nebula  - Rokinon  135mm - 2600MC - 3.5 Hours, Itto Ogami
Powered byPixInsight

Sadr Region and Crescent Nebula - Rokinon 135mm - 2600MC - 3.5 Hours

Getting plate-solving status, please wait...
Sadr Region and Crescent Nebula  - Rokinon  135mm - 2600MC - 3.5 Hours, Itto Ogami
Powered byPixInsight

Sadr Region and Crescent Nebula - Rokinon 135mm - 2600MC - 3.5 Hours

Equipment

Loading...

Acquisition details

Loading...

Description

Sadr Region and Crescent - Rokinon 135mm - 2600MC - 3.5 Hours

Robert Moses State Park NY - 8/3/22

105 x 120" - 20 Darks - 100 gain @ f/2.8

Guiding .2 - .7 RMS Guiding all night

The Rokinon/Samyang 135mm Lens lens is very sensitive to backfocus. I used micro spacers and measured with digital calipers to get it as good as I could, but it's not perfect yet. I believe he 135mm will eventually be a winner, but to get it perfect will take some work. I've been doing 60 x 1 second unguided subs from home, stacking , checking my stars and adjusting accordingly. I will work on it more once imaging season ends for me in the winter. I tried an hour on Andromeda at f/2 to test that focal ratio and the stars were far worse. As is mentioned on the net and from my discussion with those who use this lens to image, it seems to be true that imaging wide open at f/2 really affects the stars unless its spot on. f/ 2.8 was far better but still needs adjusting. I'm gonna try to get it right at f/2 though for next season. Clear Skies all!
C&C welcome 

Comments

Sky plot

Sky plot

Histogram

Sadr Region and Crescent Nebula  - Rokinon  135mm - 2600MC - 3.5 Hours, Itto Ogami