Askar 151 PHQ Review - Part 2: Optical Test
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DESCRIPTION:
This is the second video of a two-part series in which I review Askar's latest astrograph, the awesome Askar 151 PHQ, a monster 6" refractor with a 1,050mm focal length. In the previous video, I did an unboxing and shared my first impressions. In this video, I go over the results of a series of quantitative and qualitative optical tests I ran on this telescope and its reducer.
Support the channel by using the affiliate links below if you want to purchase anything from Agena Astro, my favorite astro retailer :)
My equipment:
Askar 151 PQH: http://bit.ly/3RQFFyJ
Askar .7x reducer for PHQ series: https://bit.ly/3Q9uvnC
Askar M54 T-Ring for Canon DSLR EOS Cameras: https://bit.ly/40gsXvp
Askar M54 T-Ring for Nikon F-Mount DSLR Cameras: https://bit.ly/40cbIvj
Askar M54 Backfocus Adjuster: https://bit.ly/40c0qal
Askar M54 Female to M48 Male Backfocus Adjuster: https://bit.ly/3QA5sKx
iOptron CEM70 Center Balanced Equatorial Mount: https://bit.ly/3PzUMuP
iOptron Tri-Pier: https://bit.ly/3RhDzYz
Antlia V-Series LRGB Pro Imaging Filter Set: https://bit.ly/3LHcRVJ
Antlia SHO Narrowband 3nm Pro Imaging Filter Set: https://bit.ly/3Rj3yii
ZWO 8-Position Electronic Filter Wheel: https://bit.ly/488uvuW
ZWO ASI533MM Pro Cooled Monochrome Astronomy Camera: https://bit.ly/4887g4b
ZWO ASI174MM Mini Guide Camera: https://bit.ly/469sJYv
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Music credits:
Scott Holmes Music: Feeling Home
The 126ers: See You On The Other Side
Image credits:
Third quarter moon by Thierry Legault - http://www.astrophoto.fr/
Links mentioned in the video:
Cloudy Nights thread about the Askar 151 PHQ: https://www.cloudynights.com/topic/87...
GitHub repository containing the Python notebook used to estimate the amount of longitudinal chromatic aberration in a refracting telescope: https://github.com/jlecomte/chromatic...
Roland Christen's notes on star testing refractors: https://www.csun.edu/~rprovin/roland/...
CHAPTERS
00:00 Introduction
01:15 Disclaimer
01:47 Quick Collimation Check
02:31 Visual Test
06:12 Longitudinal Chromatic Aberration
10:47 Wavefront Analysis
13:27 Imaging Performance
17:57 Conclusion