Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  10 Cep)  ·  10 nu. Cep  ·  12 Cep  ·  5 Cep)  ·  5 alf Cep  ·  9 Cep  ·  Alderamin  ·  B151  ·  B152  ·  B153  ·  B154  ·  B160  ·  B161  ·  B162  ·  B163  ·  B165  ·  B166  ·  B354  ·  B359  ·  B360  ·  B365  ·  B366  ·  B367  ·  B368  ·  Erakis  ·  Erakis (μ Cep)  ·  HD199354  ·  HD199937  ·  HD199967  ·  HD200205  ·  And 175 more.
Getting plate-solving status, please wait...
IC1396 & friends - Backfocus testing, Jan Erik Vallestad
Powered byPixInsight

IC1396 & friends - Backfocus testing

Getting plate-solving status, please wait...
IC1396 & friends - Backfocus testing, Jan Erik Vallestad
Powered byPixInsight

IC1396 & friends - Backfocus testing

Equipment

Loading...

Acquisition details

Loading...

Description

The last image I could muster before summer was spent testing backfocus for my Samyang 135mm. Fitted with EAF, Astrodymium kit and the ZWO Nikon adapter. Without any further backfocus adjustment it suffered severely as can be seen in the lower right corner, I had to manually remove most of the stars.

Proper backfocus was found using a 0.1mm shim which gave me good stars at F/4 and manageable stars to remove at F/2. Looks promising before the season kicks in again!

Four frames in total that are cropped quite a bit due to cloud interference on the RGB channels at the right side, but also due to manual panel settings in AA+ that didn't quite work out as it wasn't planned to be a mosaic from the getgo. Ha gathered on several nights 3 panels around 45-50 frames and one at mid 20's, RGB stars captured simultaneously during a short window of opportunity.

Comments