Thoroughly test the new Optolong L-Extreme F2 filter

source:Optolongpopularity:1258Release Time:2023-09-11

Thoroughly test the new Optolong L-eXtreme F2 filter

The supernova remnant G65.2+5.7

Image and article Credit: Tommaso Massimo Stella (Italy)

 

 

The supernova remnant G65.2+5.7 is observed with great difficulty in a dense area of stars on the border between the constellation of the Swan and the Volpetta. It is composed of very faint Ha and OIII filaments called Sh2-91, Sh2-94 and Sh2-96.
Remarkably large (180x150 a.l.), it is 2600 light years away from our solar system and can only be photographed by means of telescopes or lenses with short focal lengths.
I chose this subject to thoroughly test the new Optolong L-Extreme F2 filter designed especially for very fast optics.
I was satisfied with the result even though I would have had to photograph under a better sky to get a stronger and more defined signal.
Date: 2023-08-11,12,13
Location: Valle degli Ulivi (TA) ITALY
SQM: 19,85
Lights: 93x600s
Total exposure: 15.5 h
Telescope/Lens: Samyang 135mm @f/2
Camera: Omegon veTEC 571C V4
Filters: Optolong L-eXtreme F2
Mount: Skywatcher AZ-EQ6 GT
Processing: DeepSkyStacker, PixInsight, Photoshop CC