Anyone tested full-frame with the Askar 120 APO? On the product page of Sharpstar/Askar are some images with a ASI6200 camera, both native and reducer focal length. But "real-world" experiences are better  |
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I have. What would you like to know? I can send you some raw files if you like.
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I have. What would you like to know? I can send you some raw files if you like. That would be great! Google-Drive for the raws? I plan to use my ASI 2400 MC Pro with a pixel-size of 5,94 µm.
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"real-world" experiences are better Even though I do not own a full-frame camera, and probably will not be able to afford one any time soon (there is already a very long priority AP upgrade list  ), but I am keen to know what comes out of the real-world with this lens!
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I have. What would you like to know? I can send you some raw files if you like.
That would be great!
Google-Drive for the raws?
I plan to use my ASI 2400 MC Pro with a pixel-size of 5,94 µm.
I will upload them tonight when I get home. I have the ASI 6200MC
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This may not answer your question specifically, but I am using a full-frame camera (6200mm pro) with different Askar scopes from their PHQ, FRA, .. and one thing I mentioned is that they deliver a very good picture once you fine-tune everything.
On their bigger scopes, such as 130, I have sharp starts edge to edge with native or reduced focal length.
The only issue I have with their low Focals is the reflection from starts close to edges but outside of frame. I checked this with WilliamOptics FS Premium series (which was even worse than Askar), so maybe that's my set up/
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Here are a few fits files zipped up from the ASI 6200 MC Pro on my ASKAR 120 APO. These files will get deleted in a week or so. https://www.dropbox.com/s/tqif6h8smkjhid3/Archive.zip?dl=0 |
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Many thanks!
Stars looking good! I dont see any elongated stars…
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Many thanks!
Stars looking good! I dont see any elongated stars... I consider both the camera and the scope to be A++. The Askar 120 APO was perfect out the box.
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I've tested the scope with full-frame as part of my video review of it, - I don't know if posting links on here is permissible but you can find me on YouTube as lukomatico - hope it helps!
Overall I've been incredibly happy with the scope's performance, I can't say anything bad about it really - for context, I also owned an esprit 120 which I regretted parting with, I actually like this more.
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Luke Newbould:
I've tested the scope with full-frame as part of my video review of it, - I don't know if posting links on here is permissible but you can find me on YouTube as lukomatico - hope it helps!
Overall I've been incredibly happy with the scope's performance, I can't say anything bad about it really - for context, I also owned an esprit 120 which I regretted parting with, I actually like this more. Luke, Can you compare and contrast these 120 refractors? I believe the Esprit to be the better corrected scope because it is supposed to have FPL-53 glass in the lens and in the flattener. The Askar is cheaper glass and less well corrected (look at it's spot diagrams), but the mechanics seem to be exceptional and it has a working 0.8x reducer. Not sure how well the Esprit reducer worked in the real world. But in real world use, what are the differences in your personal experience?
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Luke Newbould:
I've tested the scope with full-frame as part of my video review of it, - I don't know if posting links on here is permissible but you can find me on YouTube as lukomatico - hope it helps!
Overall I've been incredibly happy with the scope's performance, I can't say anything bad about it really - for context, I also owned an esprit 120 which I regretted parting with, I actually like this more. I've been subscribed to your channel for sometime! Glad you mentioned it here. Now I'm following you here.
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Here are a few fits files zipped up from the ASI 6200 MC Pro on my ASKAR 120 APO.
These files will get deleted in a week or so.
https://www.dropbox.com/s/tqif6h8smkjhid3/Archive.zip?dl=0 The one thing that bothers me with all the Askar APO subs that I saw posted is that the FWHM is not great. For example in these sub I am getting a FWHM of 4.6" using the FWHMeccentircity script on PI with Moffat4. The image scale is 0.92"/px assuming you are imaging at f/7 which is what the FITS header states. That either means the seeing conditions were really poor or the optics are just not that sharp. Or the sub is very deficient in stars to make a good measurement. Bad seeing can hide a lot of optical issues. It could very well be a wonderful scope, I just can't judge from those subs.
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Ashraf AbuSara:
Here are a few fits files zipped up from the ASI 6200 MC Pro on my ASKAR 120 APO.
These files will get deleted in a week or so.
https://www.dropbox.com/s/tqif6h8smkjhid3/Archive.zip?dl=0
The one thing that bothers me with all the Askar APO subs that I saw posted is that the FWHM is not great. For example in these sub I am getting a FWHM of 4.6" using the FWHMeccentircity script on PI with Moffat4. The image scale is 0.92"/px assuming you are imaging at f/7 which is what the FITS header states. That either means the seeing conditions were really poor or the optics are just not that sharp. Or the sub is very deficient in stars to make a good measurmenrt. Bad seeing can hide a lot of optical issues.
It could very well be a wonderful scope, I just can't judge from those subs. The next night out I will grab some subs. I was having guiding issues that night and some high clouds. I'll post them here for you to look at.
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Ashraf AbuSara:
Here are a few fits files zipped up from the ASI 6200 MC Pro on my ASKAR 120 APO.
These files will get deleted in a week or so.
https://www.dropbox.com/s/tqif6h8smkjhid3/Archive.zip?dl=0
The one thing that bothers me with all the Askar APO subs that I saw posted is that the FWHM is not great. For example in these sub I am getting a FWHM of 4.6" using the FWHMeccentircity script on PI with Moffat4. The image scale is 0.92"/px assuming you are imaging at f/7 which is what the FITS header states. That either means the seeing conditions were really poor or the optics are just not that sharp. Or the sub is very deficient in stars to make a good measurmenrt. Bad seeing can hide a lot of optical issues.
It could very well be a wonderful scope, I just can't judge from those subs.
The next night out I will grab some subs. I was having guiding issues that night and some high clouds. I'll post them here for you to look at.
Thank you! If you don't mind and you are able and willing maybe point to a star rich region in the milky way for a few subs. But please don't waste clear skies if that is too much of an ask.
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John Stone:
Luke,
Can you compare and contrast these 120 refractors? I believe the Esprit to be the better corrected scope because it is supposed to have FPL-53 glass in the lens and in the flattener. The Askar is cheaper glass and less well corrected (look at it's spot diagrams), but the mechanics seem to be exceptional and it has a working 0.8x reducer. Not sure how well the Esprit reducer worked in the real world.
But in real world use, what are the differences in your personal experience? Hey John! Sorry about the late reply, I'd be happy to share my thoughts - I had the Esprit 120 for a couple of years and honestly loved the scope, I used it a great deal over the seasons with a variety of cameras and mounts so I have a pretty good feel for how it performed - sadly, in a 'moment of madness' I decided to part with it to generate some cash for other purchases. Generally speaking, I found the Esprit to be everything that people say they are, just a beautiful scope optically. - mechanically good too, but with some silly design flaws (looking at you, floppy dew shield) The opportunity came up to review an Askar 120 Apo, so I decided to take a look and see what it was like. Truly I was a bit staggered by it, given the pricetag disparity between the two I went into the test/review with the expectation that it wouldn't hold a candle to the Esprit, and yet I feel it matched it in sharpness and colour correction, and exceeded it in build quality. It might sound like a stretch, or an overly positive review to be saying all this, but at the end of the day I liked it so much that I put my money where my mouth is, after the review was over, I simply bought it for myself! :-) Overall I couldn't be happier, it's permanently mounted on my 2nd pier and delivers quality results every single clear night I get, I loved my Esprit for all the right reasons, but I no longer miss it. If you have the time and want to see more about the scope then check out a few of my videos if you are interested: -'long vs short exposures - broadband at f7' - that will show two versions of m51 with short integrations, 90m in each case. -'Askar 120 Review - So nice I bought it' - that will show you a few test images, along with its uncalibrated performance with and without reducer + full-frame camera. -'Big & Long VS Small & Short - Are big telescopes worth it?' - that will show you results on a planetary nebula, m57, when compared side-by-side with my celestron EdgeHD11 Hope that helps! Clear skies :-)
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Back to the optical quality, my personal impression of my Askar 140 APO is also that it is not as sharp as an ESPRIT, for example. But thanks to the Pixinsight tools, it's nothing that can't be fixed. For astrophotography, however, this is a superfluous discussion, because the photos depend on so many parameters, especially seeing and tracking, that it doesn't really matter! And we all know from daylight photography that sharpness is not the only thing that matters in a photo to guide the viewer's eye. But ok, if you're a pixel peeper  , then sharpness in particular is an important issue  |
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Ashraf AbuSara:
Here are a few fits files zipped up from the ASI 6200 MC Pro on my ASKAR 120 APO.
These files will get deleted in a week or so.
https://www.dropbox.com/s/tqif6h8smkjhid3/Archive.zip?dl=0
The one thing that bothers me with all the Askar APO subs that I saw posted is that the FWHM is not great. For example in these sub I am getting a FWHM of 4.6" using the FWHMeccentircity script on PI with Moffat4. The image scale is 0.92"/px assuming you are imaging at f/7 which is what the FITS header states. That either means the seeing conditions were really poor or the optics are just not that sharp. Or the sub is very deficient in stars to make a good measurement. Bad seeing can hide a lot of optical issues.
It could very well be a wonderful scope, I just can't judge from those subs. This is my concern with Askar. They seem to design their optics to hide the abberations arising from the use of cheaper glass in the FWHM sizes? I simply don't trust Askars ray traces and spot size diagrams. They use 200 x grids to make the spots seem smaller, and their ray tracing shows zero CA..
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