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World's first 200mm F/4 APO Flat-Field Astro Camera Lens will be released in this month

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#1 sharpstar

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Posted 05 July 2020 - 04:17 AM

Optimized for astrophotography

 

Excellent color correction and distortion control at corners for full-frame using

 

M48 X 0.75 thread can be used for most cameras with adapter

 

2" filter thread included into the end part of lens

 

Tow ED glass included and total 6 elements

 

Tow focus ways which is included a "1mm micro-adjustment" will be better for Astrophotography 

 

Standard Vixen dovetail plate with camera tripod thread

 

http://www.askarlens...class1/179.html


Edited by sharpstar, 05 July 2020 - 05:11 AM.

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#2 wargrafix

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Posted 05 July 2020 - 04:48 AM

price?



#3 sharpstar

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Posted 05 July 2020 - 04:59 AM

retail price $699



#4 Sandy Swede

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Posted 05 July 2020 - 05:51 AM

Don't think I will trade this for my Canon 200mm f/2.8 bought slightly used for $400

May put some pressure on the Rokinon 135mm f/2 which retails for about $475.  Starting to see these for sale on CN. 

Looks like Askar also makes or will make a 400m Petzval design https://astronomytec...torial-mount-2/

 

Let's see, a relatively new company based in China, hmmm.  Sharpstar, Askar, Jiaxing RuiXing optical instrument co., LTD.  I am not an early adopter, so for now I will stick with Japanese or Taiwan glass.

 

Could this be an indication that the AP trend (mania?) has peaked?

 

Askar/Sharpstar users chime in please.



#5 garret

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Posted 05 July 2020 - 08:14 AM

 

Could this be an indication that the AP trend (mania?) has peaked?

It has peaked 10 years ago, I started AP in 2008, at that time there was big news in the field of Astro photography every year, hardware and software.

 

But this lens is interesting...



#6 Sandy Swede

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Posted 05 July 2020 - 12:19 PM

What is appealing about the Askar ACL200 is the robust tripod adapter ring so you don't have 3 lbs of glass hanging off the front of your camera.  I can't tell if it is a Vixen style dovetail or arca swiss.  The lack of a lens ring is my biggest complaint against my Rokinon 135mm.   There is a fellow in France who 3D prints a very nice ring system for the Rokinon, but it costs about 120 Euros. 

 

However, a new Canon 200mm f/2.8 is $750; $50 more than the Askar, but f/2.8 vs f/4 and the known quality of Japanese optics.

 

Later edit by Sandy:  I missed the part in the original post about it having a Vixen style dovetail with camera tripod thread. 


Edited by Sandy Swede, 05 July 2020 - 06:26 PM.


#7 Jeff Morgan

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Posted 05 July 2020 - 05:41 PM

Enough back focus to fit a star diagonal for visual use?


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#8 Sandy Swede

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Posted 05 July 2020 - 06:20 PM

Enough back focus to fit a star diagonal for visual use?

Excellent question, Mr. Morgan.  I would guess 'no' as it is marketed as a lens.  Hmmm.  An opportunity for a very expensive accessory - a focuser?



#9 Michael Covington

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Posted 05 July 2020 - 06:25 PM

All the telephoto lenses ever made have aimed to have flat fields and correction for chromatic aberration.  Quite a few do really well at f/4.  I am not at all sure this f/4 lens is going out outperform any of several leading 200/2.8 lenses (at f/4).  

At $250 this would be appealing.  At $699 it's more expensive than some well-known very good lenses on the secondhand market.

 

As for whether astrophotography has peaked, I think right now the action involves mounts, and to some extent cameras, not optics.  Fifteen years ago, optics was a hot issue as everybody moved into the digital era and discovered that film-camera lenses often weren't sharp enough.  Five years ago, we had a new generation of camera sensors coming out.  Right now the hot issue is performance of equatorial mounts.


Edited by Michael Covington, 05 July 2020 - 06:28 PM.

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#10 sharpstar

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Posted 05 July 2020 - 11:08 PM

What is appealing about the Askar ACL200 is the robust tripod adapter ring so you don't have 3 lbs of glass hanging off the front of your camera.  I can't tell if it is a Vixen style dovetail or arca swiss.  The lack of a lens ring is my biggest complaint against my Rokinon 135mm.   There is a fellow in France who 3D prints a very nice ring system for the Rokinon, but it costs about 120 Euros. 

 

However, a new Canon 200mm f/2.8 is $750; $50 more than the Askar, but f/2.8 vs f/4 and the known quality of Japanese optics.

 

Later edit by Sandy:  I missed the part in the original post about it having a Vixen style dovetail with camera tripod thread. 

The ACL200 is a lens design but reached all standards as a APO telescope and Astrograph. As you know, for a F4 Refractor Astrograph is very fast. More, we guarantee the quality of F4 that as good as most telescope Astrograph. 



#11 sharpstar

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Posted 05 July 2020 - 11:11 PM

Enough back focus to fit a star diagonal for visual use?

not suitable for diagonal using, but you can use a M48-1.25" adapter + 1.25 eyepiece to see directly, 



#12 sharpstar

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Posted 05 July 2020 - 11:17 PM

All the telephoto lenses ever made have aimed to have flat fields and correction for chromatic aberration.  Quite a few do really well at f/4.  I am not at all sure this f/4 lens is going out outperform any of several leading 200/2.8 lenses (at f/4).  

At $250 this would be appealing.  At $699 it's more expensive than some well-known very good lenses on the secondhand market.

 

As for whether astrophotography has peaked, I think right now the action involves mounts, and to some extent cameras, not optics.  Fifteen years ago, optics was a hot issue as everybody moved into the digital era and discovered that film-camera lenses often weren't sharp enough.  Five years ago, we had a new generation of camera sensors coming out.  Right now the hot issue is performance of equatorial mounts.

Yes, but for some users current lenses are not good enough for astrophotography, they are all not optimized for Astrophotography, the ACL200 is a APO and real Flat-Field design. We can offer lens to the person who are interested in comparing with if he owned similar 200mm lenses. Send us email and we see the result.     


Edited by sharpstar, 05 July 2020 - 11:22 PM.

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#13 Michael Covington

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Posted 06 July 2020 - 08:18 AM

Current weather conditions and workload do not permit me to test it myself, but I hope someone will test it and publish the results.  It is indeed possible that by optimizing just for f/4, you can do better than other lens designs.  I look forward to seeing!


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#14 sharpstar

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Posted 09 July 2020 - 09:48 PM

First light with Askar ACL200 F/4 APO astronomical lens

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#15 sharpstar

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Posted 09 July 2020 - 10:01 PM

The Askar ACL200 lens  is supported for full frame astrophotography

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#16 sharpstar

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Posted 13 July 2020 - 02:07 AM

There is a 1mm travel micro-adjustment of Askar ACL200 F/4 Astronomical lens, which will be more precision to get the real focus when take astrophotography.

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#17 Michael Covington

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Posted 13 July 2020 - 10:27 AM

Actually now I realize you are competing against Redcat, giving us a set of optical specifications that compete more effectively against telephoto lenses (200/4 rather than 250/5).  I will keep paying attention to this.


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#18 sharpstar

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Posted 13 July 2020 - 09:30 PM

Actually now I realize you are competing against Redcat, giving us a set of optical specifications that compete more effectively against telephoto lenses (200/4 rather than 250/5).  I will keep paying attention to this.

Please go to below link to see the spot diagram and other info of ACL200, it's 6 elements design and 2 ED lenses for a Astrograph design.

 

http://www.askarlens...class1/179.html

 

Also we add the F4-F22 aperture that let customers using it like a normal lens.

 

We just hope customers can use Astrograph very easily and make it as portable as we can.


Edited by sharpstar, 13 July 2020 - 09:41 PM.

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#19 Astrojedi

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Posted 17 July 2020 - 07:03 PM

Is this available right now and where can we order it here in the US?



#20 sharpstar

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Posted 18 July 2020 - 02:32 AM

Is this available right now and where can we order it here in the US?

Will be available in 2 weeks and you can purchase from Agena Astro or Camera Concepts.



#21 sharpstar

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Posted 18 July 2020 - 02:40 AM

The Askar ACL200 F/4 Astronomical Flat-Field APO Lens is easy to screw into a 2" filter to use

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#22 Michael Covington

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Posted 18 July 2020 - 10:20 AM

Two things to remember when considering the total cost:  The ability to take 48mm filters (is it 48mm?) and the presence of a tripod foot with a  Vixen dovetail.  That saves you some money on accessories.


Edited by Michael Covington, 18 July 2020 - 10:20 AM.


#23 Astrojedi

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Posted 18 July 2020 - 12:21 PM

Will be available in 2 weeks and you can purchase from Agena Astro or Camera Concepts.

Thanks. I am interested in buying this lens as it does meet many of my requirements. Do you have any full resolution broadband images from the lens? I am only seeing narrowband images in this thread.


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#24 sharpstar

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Posted 19 July 2020 - 10:41 PM

Thanks. I am interested in buying this lens as it does meet many of my requirements. Do you have any full resolution broadband images from the lens? I am only seeing narrowband images in this thread.

Yes, very soon you will see



#25 nicknacknock

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Posted 29 July 2020 - 12:23 AM

This should be fun for quick widefield EAA. Will be keeping an eye out on this thread for more info :)




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