Askar 71F Flat Field Quadruplet APO Refractor - Full Review
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- เผยแพร่เมื่อ 9 ก.พ. 2025
- This is my full review of the new 71F quadruplet apochromatic refractor telescope from Askar. It's an excellent little telescope both for visual observations as well as for astrophotography. Check this video out to find out more about its strengths and weaknesses. Enjoy!
⬇️ More Information down below ⬇️
Contents of this video:
0:00 - Intro
0:49 - About Askar/Sharpstar
1:57 - Unboxing / Build quality
7:05 - Optical performance - visual
9:01 - Optical performance - imaging
12:25 - Conclusion
Items presented in the video:
Askar 71F Flat Field (affl): amzn.to/4aZWQ6Z
Svbony SV503 102ED (affl): amzn.to/481FuGp
Svbony SV215 3-8mm Zoom (affl): amzn.to/3T8VIIb
Review: • Svbony 3-8mm Planetary...
Tele Vue DeLite 9mm (affl): amzn.to/3XpazAA
Review: • Is it really that good...
Svbony UV/IR cut filter 1.25” (affl): amzn.to/3zlEvUz
Svbony SV705C camera (affl): amzn.to/4g0hyXi
The t-shirt I'm wearing (affl):
cottonbureau.c...
NASA Apollo Saturn V Lego set (affl): amzn.to/40jhdrf
Astro Software
ASCOM: www.ascom-standards.org
ASCOM OnStep Driver: stellarjourney.com/main/onstep-ascom-driver-software
NINA: nighttime-imaging.eu
Stellarium: stellarium.org
Deep Sky Stacker: deepskystacker.free.fr/english/index.html
Gimp: www.gimp.org
Thank you for your support!
Thanks Bogdan, your reviews are always knowledgeable, well done and thorough.
Best tee shirt, my friend. It is my favorite that I gift to family and wear very often to the delight of fans.
Thanks for your thorough review of the Askar 71F. I have purchased one and was very surprised with it's overall performance and the quality of the pictures I have taken with it. I currently have on order the 0.75 Reducer that will widen the field of view so am looking forward to seeing how that further affects the performance and quality of the images.
Picked it up a couple of days ago. My initial concern and probably the only concern was that it was bit slow at f6.9. But as someone who lives in Arizona with 320+ days of clear weather, I don’t mind the slow scope at this price. Ironically haven’t got a chance to test it yet, because it’s been cloudy since the day I got the scope 😂
That’s me every time I scope
I own it. I love it. The only thing I had to do was get some riser blocks so I get my auto focuser to clear the dovetail plate.
I've fixed that on my Askar FRA400 with a few risers O-rings and longer screw. A big total of 5 bucks :)
I bought the Askar71F to fill the focal length gap between my RedCat51 and AT115. I love that it has multiple dovetail attachment points. The focuser on mine is not completely smooth and feels a little gritty at points but is still quite serviceable. I paired it with an ASI585MC Pro and it performs well. I’m not fond of 45 degree diagonals for anything but a terrestrial spotting scope. I’m trying to figure out how this scope can be mounted on a camera tripod. The dovetail has two threaded holes but isn’t reversible and standard camera tripod attachment screws are too short to reach inside that dovetail. I prefer the camera rotator rather than the focuser rotating. I’m using it on an AM5 and with the ASIAIR. All things considered, it’s a great scope for the money.
nice shirt ... youre a real connaisseur 😊
To be honest considering the aperture, these pictures are pretty amazing, good scope for photography in my opinion.
i just bought the askar 71f. I noticed that you have the exact same bresser mount with the OnStep V4 Pro kit that I have. I wanted to ask you what length exposures you're able to get with it as well as ask how you align it through NINA or other software to help the mount figure out where it is. I haven't seen any of the better astro channels like yours who use that mount. im excited to see someone else who still uses it. Do you have any issues with autoguiding? Thank you. and Thank you for your videos
I just got one and indeed is a great scope. The only issue I have is regarding the space between the scope and the dovetail mounting plate (the same issue mentioned in several reviews of the 71F). In my case after I mounted an electronic autofocuser (EAF) on the scope the dovetail plate cannot be moved to balance the scope on the mount. The solution of course is to install a pair of raiser blocks but I am having a hard time finding them in the appropriate size. Does anybody have a suggestion to solve this issue?
Can't wait to get one. I can buy new here for $450 this very setup.
Nice scope, shame you did not test with a bigger sensor, to check on the field flatness.. as this is pretty important for an advertised flat field scope…good video all the same 👍🏻
Great shirt dude
Why you have not compared with SVbony ? Askar comes with 2 eyepieces, star diagonal, extenders and adaptors and built in field flattener. This is bargain of the year!
Do you have a 2 inch zenit mirror and check if you get in focus?
Askar makes some decent scopes for the price point
I learned one important thing, when entering astrophotography after 30 years absence, and that is CLOUDS and TIME. Hence, I'd much rater opt for the Altair 70mm EDQR F5, it gives you twice the fun (speed) which in these continously more cloudy skies is pretty important. And it's not twice the price, and the optics are s-fpl 53. I think it speaks for itself, even though the Akskar is a good budget option, well that is until you put money on your 2x of hours you need to capture similar amount of photons.
looking for the best light rig setup based on the SvBony 503ed 80mm with Skywatcher Adventurer GTI mount. Can you provide suggestions?
@michaelnixon6672 If you are looking too keep things as light as possible, I would recommend a zoom EP, like the SV215. It will be a great match for the telescope in terms of quality and available magnification - maximum flexibility. The only downside being the short eye relief.
If you are looking for the best image quality for planetrary observations including a generous eye relief possible, then consider the 4mm DeLite from Tele Vue.
Alternatively go for the 7mm DeLite + a 2x Barlow from Tele Vue for more flexibility.
Whichever eyepiece you go with, make sure that the diagonal you use is up to the job as this can be a bottleneck for the whole setup. Hope this helps.
Thanks Bogdan, I've a Skymax 150 and im looking for something that's better for deep sky objects, in your opinion do you think this would be better for this?
@graemedevine9651 Yes, because the FOV of the 71F is much wider than the one of the SkyMax and will allow for wider DSOs to fit in one frame.
@@BogdanDamian thanks, I've found an Explore Scientific 102mm F/7 ed apo for the same amount but from your review I think I would be better getting this Askar.
@@graemedevine9651 Прошу Вас, прежде, чем делать такие заключения почитать теорию астрофотографии и технические характеристики телескопов, а именно конструкцию, что такое ED, APO, Super APO, Triplet, Quadruplet, в чем между ними различие и как это различие влияет на качество картинки
Если не вдаваться подробности, то условно существуют телескопы для визуальных наблюдений и для астрофотографии.
В астрофотографии крайне важна максимальная коррекция оптических аберраций различного порядка, от простого хроматизма, до сферических разного порядка.
При визуальных наблюдениях, в первую очередь важна апертура, а при астрофотографии светосила. Да, это прямо связано между собой, но это связано большой разницей в стоимости телескопов. Телескоп из видео чисто для астрофотографии, визуально в него только если на Луну смотреть. Ваш Skymax 150, это телескоп чисто для визуальных наблюдений. Explore Scientific 102mm F/7 ed APO отлично подойдет для визуальных наблюдений, для фотографии объектов дальнего космоса, вам надо дополнить его редуктором фокуса и корректором поля.
Any telescopes primary purpose is to gather as much light as possible. All things equal, go bigger. (Ed Ting)
To each their own.
Thanks! -mike
Is this ok as a first telescope?
@254lele It depends for what you want to use it. If it's for astrophotography, then yes. If you want to do visual observations with it, then there are better options out there with better light gathering capabilities. For example the SV503 102 from Svbony, Celestron C5, Skywatcher SkyMax 127 or simply a 8" Dob.
@@BogdanDamian ok, but apart from observing distant objects such as nebulae and galaxies, can it be suitable for Moon Mars Saturn? I am very beginner
@254lele For observing the Moon and maybe Jupiter its fine, but for Mars and Saturn, where you need higher magnifications, the short focal length of the 71f won't be sufficient. As for observing deep sky objects, with a few exceptions like Orion, Pleiades, Andromeda and some globular star clusters, the aperture is too small to gather the necessary light information.
Apo frr, please explain the safix of askar models 🎉❤
It appears to be an extraordinary well built telescope. However, that is a really small aperture limiting light collection.
The 51 Redcat is even smaller and it does a good job of collecting light/imaging.
does it include a tri pod ?
@dks13827 No, you'll have to get a tripod and mount head separately.
Thank you.
Interesting.
Most of the stars were egg shaped right to the center of the image. They weren't round as you have pointed out. That may be something to do with the mount's guiding or flexture and not the optics though.
Like
DUDE!! just loosen the tube clamps and slide forward an inch jeez. If your really worried about weight distribution (Not sure why since its pretty darn light) just hacksaw off an inch of the dovetail. Plenty of material left. If that is sacrilegious to you then flip the bar in reverse and put one of the screws in the "hole" rather than the slot and BAMB, problem solved. No law says you have to place both screws in slots.
Crisp views of the moon lol