10/14/21 Comparing barlows in calcium Triplet vs Quadruplet

[Kitsunegari]

Explore scientific firstlight 127mm x 1200mm achromat with basler aca1920-155um camera

Identical processing,  Identical amount of frames.   +1 difference in gain setting on the triplet. 

 triplet set focuser position to about 17mm.       quadruplet set focuser position to about 32mm.    The focal point of the quadruplet barlow is nearly double,  which was not expected.

 

I think i see finer surface detail on the triplet  in the white mottle's,  but  sharper overall image detail on the quadruplet.   This could be a moment of atmosphere affect of better seeing condition, or  simply a fumble  by my hand with focus on the triplet.

2" Celestron Luminos 2.5x Quadruplet 

FPS (avg.)=149
Shutter=6.629ms
Gain=13 (36%)
Gamma=140

1500 frames / -90%  /  stacked best 4%

 

 

 

 

1.25" Celestron Ultima SV 2x Triplet 

FPS (avg.)=149
Shutter=6.629ms
Gain=14 (38%)
Gamma=140

1500 frames / -90%  /  stacked best 4%