Askar 151 PHQ Review - Part 2: Optical Test

CLICK ON THESE AFFILIATE LINKS TO SUPPORT THE CHANNEL:
* Agena Astro: https://bit.ly/487tmnj
* High Point Scientific: https://bit.ly/49z9qdv
* Amazon: https://bit.ly/darkskygeek-amazon-aff...

OTHER WAYS YOU CAN SUPPORT THIS CHANNEL:
* Send a donation via PayPal: https://www.paypal.com/donate/?hosted...
* Click on the "Thanks" button in the toolbar located underneath this video.
* Join the Dark Sky Geek Community Discord server:   / discord  
* Like, subscribe, comment on this video, tell your friends about it, etc.

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

Follow me!
* Instagram:   / darkskygeek  
* Facebook:   / julien.lecomte  

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