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CFF92 Under Test

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39 replies to this topic

#26 moshen

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Posted 15 April 2018 - 06:31 PM

 

Thanks for sharing your setup! I'm going to work on CADing up and 3D printing a simple LED/Ronchi eyepiece holder.

I just put pics of my first cut design at this here:

 

https://www.cloudyni...grating-holder/

 

Printing now we'll see how it works and if any tweaks should be made.



#27 contrailmaker

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Posted 15 April 2018 - 09:25 PM

Does CFF make their lenses in-house or do they get them from LZOS?

 

CM



#28 danielguo

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Posted 15 April 2018 - 10:49 PM

Does CFF make their lenses in-house or do they get them from LZOS?

 

CM

In-house, made by Pal Gyulai in Hungary.



#29 contrailmaker

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Posted 16 April 2018 - 12:04 PM

Thanks. It looks like their optics are outstanding.

 

CM



#30 t.r.

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Posted 17 April 2018 - 07:36 PM

Looks like the CFF 92 will have some new competition...namely the new AP Stowaway! 😀
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#31 areyoukiddingme

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Posted 17 April 2018 - 09:29 PM

Looks like the CFF 92 will have some new competition...namely the new AP Stowaway!

 

The .01 difference in Strehl will be obvious!


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#32 elwaine

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Posted 17 April 2018 - 10:41 PM

Looks like the CFF 92 will have some new competition...namely the new AP Stowaway!

The .01 difference in Strehl will be obvious!

 

In whose favor?



#33 Asbytec

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Posted 17 April 2018 - 11:11 PM

One look at the star test images and congratulations are in order. So, congratulations. :)



#34 Suavi

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Posted 18 April 2018 - 02:01 AM

In whose favor?

I am anticipating some very exciting 92mm refractor shootouts happening in a few moths yay.gif popcorn.gif



#35 glend

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Posted 18 April 2018 - 12:27 PM

Looks like the CFF 92 will have some new competition...namely the new AP Stowaway!

There is a new TS90 Photoline FPL-53 Triplet APO at f6,6  from Teleskop-Express which is available without a ten year wait list (like the AP), and a significant savings to the AP and CFF. Specs are excellent.

 

     


Edited by glend, 18 April 2018 - 12:31 PM.

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#36 peleuba

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Posted 18 April 2018 - 12:45 PM

There is a new TS90 Photoline FPL-53 Triplet APO at f6,6  from Teleskop-Express which is available without a ten year wait list (like the AP), and a significant savings to the AP and CFF. Specs are excellent.

 

Specs - you mean design criteria?  I don't see anything that discusses optical design other then dropping the FPL-53 moniker and a spot graph in the description.  Doesn't matter anyway as best case design "specs" rarely track to real world execution; UNLESS, the optician can correct/tweak the curves based on the melt data of that particular batch of glass.  At this price point that is NOT happening.  And, who knows what quality of FPL53 was specified for this telescope?

 

There is a startest image shows a big central zone and some machine polishing artifacts.  But, it looks like its got terrific color correction.

 

The TS90 is a good buy if you want a mass produced optic in an OTA with a cheap imitation of a FT focuser. 

 

Customers looking at the CFF92 and now Stowaway reboot are not the target market for the TS90.  Different scopes for different folks, if you will.


Edited by peleuba, 18 April 2018 - 01:05 PM.


#37 peleuba

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Posted 18 April 2018 - 12:55 PM

Looks like the CFF 92 will have some new competition...namely the new AP Stowaway!

 

Yes - though I recently heard that the CFF92 is sold out.  It was a limited run of 15 telescopes.  We'll see though - I am on the Stowaway list.

 

I can only speak for my own experience but my CFF92 is superb.  I would expect that the only diff between the scopes will be physical (appearance, overall build and accessories).  Optically, the diff will only be related to focal length.  



#38 jay.i

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Posted 18 April 2018 - 01:56 PM

There is a new TS90 Photoline FPL-53 Triplet APO at f6,6  from Teleskop-Express which is available without a ten year wait list (like the AP), and a significant savings to the AP and CFF. Specs are excellent.

This isn't new at all. That objective has been in a few different tubes now, mostly carbon fiber, for years... Wolfgang Rohr did a test on one back in 2009. They are reportedly quite good. Nice try glend, it's also on a waitlist. You should also know the new Stowaway is a new list entirely and will not have a pre-imposed 10 year wait. Sounds like your name has been on a list for a while and you haven't gotten the call yet...


Edited by jay.i, 18 April 2018 - 01:57 PM.


#39 fate187

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Posted 14 February 2020 - 01:13 AM

Sorry if I dig this up again, but I have seen you Paul doing the DPAC with red and blue. Did you do this for this lens as well?

 

best

Michael



#40 peleuba

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Posted 14 February 2020 - 09:03 AM

Sorry if I dig this up again, but I have seen you Paul doing the DPAC with red and blue. Did you do this for this lens as well?

 

 

 

Yes, as well as an interferometry study.  I don't own the telescope any longer so I will not publish any bench results.  But, let me say this - My CFF92 was one of the top two or three sub ~100mm lenses I have ever owned.  Its really good.


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