10 replies to this topic

[Jeff B]

Like the title says, the third sample I have tested.

 

Little Moose is a fan too.

 

And typical boring, nothing to argue about AP optics.    

 

More later after my nap.

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Edited by Jeff B, 04 March 2025 - 05:17 PM.

[Jeff B]

So here are the mug shots of the usual suspects.

 

First the white light and at focus green images.

 

The white light images suggest an overall neutral correction with little, if any, secondary spectrum (lack of color fringing on shadows straddling the center shadow) and spherochromatism is well controlled, with only a small amount in the blue seen as some blue fringing at the tips of the shadows, inside of focus.

 

The at focus image (with hyped contrast to bring out detail) shows a smooth figure of revolution, with a mild, smoothly transitioning center zone covering about 30% of the center.  You can also detect the center zone as very subtle "dents" on the inside centers of the shadows straddling the center shadow in the inside of focus image and subtle "bumps" in the same place in the outside of focus image.  

 

Nothing much to see here.

 

Jeff

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[drprovi57]

Nice DPAC results on the AP110GTX.  Question:  Have you performed DPAC on the new AP92 Stowaway scopes?  I recently was fortunate enough to purchase a new AP Stowaway scope and found it to have excellent optics.

 

Thanks

jason

[Jeff B]

Nice DPAC results on the AP110GTX.  Question:  Have you performed DPAC on the new AP92 Stowaway scopes?  I recently was fortunate enough to purchase a new AP Stowaway scope and found it to have excellent optics.

 

Thanks

jason

 

Nice DPAC results on the AP110GTX.  Question:  Have you performed DPAC on the new AP92 Stowaway scopes?  I recently was fortunate enough to purchase a new AP Stowaway scope and found it to have excellent optics.

 

Thanks

jason

Yes, I have Jason and the results are on CNs someplace but they are also here in comparison to a CFF 92, F6.9

 

https://www.cloudyni...f-92-f69/page-2

 

Postings 29, 34 and 35.  Here is the Star test of my former Stowaway too.

 

Jeff

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[peleuba]

Nice DPAC results on the AP110GTX.  Question:  Have you performed DPAC on the new AP92 Stowaway scopes?  I recently was fortunate enough to purchase a new AP Stowaway scope and found it to have excellent optics.

 

Yes there are a few samples that have been tested.

 

HERE is a repository of many scopes tested

 

HERE is a Stowaway

 

HERE is another Stowaway mixed in with other smaller scopes.

Edited by peleuba, 05 March 2025 - 04:16 PM.

[Jeff B]

So here are some comparisons with the three samples that have come my way, from left to right in each image, serial numbers 013, 027 and 028.

 

First the inside/outside of focus images.

 

Then the at focus images in green.

 

Very consistent in figure IMO, with only minor differences in the edges and center, exactly what you expect from hand figured optics.

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[Jeff B]

Here are the inside of focus color montages, top to bottom, serial numbers 013, 027, 028.

 

Again, no real differences in secondary spectrum or spherochromatism with both very well controlled from blue to red.

 

I did not have the chance to star test serial numbers 013 and 028,  but, thanks to a very generous CNs member, I did spent several months with S/N 027.   It is superb in every regard with no coma, astigmatism or "CA" at any power I chose up to almost 250X.  Color balance/tone was quite neutral, clinical really.  And build and fit & finish were like you read about...and true(!).  I still miss it and one of these days, my name, I hope, gets drawn for my sample.

 

Jeff

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[Scott in NC]

Very nice job, as always, Jeff!

[DeanS]

Can your tests show Spot Sizes? 

 

Roland makes a point to show these in the specs for the 110 where as in the past very few mfg would show this.   And some of his flattener/reducers are being made to benefit from smaller pixels too.

 

With the smaller CMOS pixels sizes it seems like not a perfect fit for optics made in the past?  Or is this just splitting hairs?

 

Dean

[Jeff B]

Can your tests show Spot Sizes? 

 

Roland makes a point to show these in the specs for the 110 where as in the past very few mfg would show this.   And some of his flattener/reducers are being made to benefit from smaller pixels too.

 

With the smaller CMOS pixels sizes it seems like not a perfect fit for optics made in the past?  Or is this just splitting hairs?

 

Dean

Sorry Dean but, at best, I believe we can only infer the design Strehl curves relative to green from DPAC.  

 

For example, assume there is no secondary spectrum and that only spherochromatism is at play with perfect edges.  These are perhaps a reasonable assumptions based on what I see in the images.  Then use AOS, to model the green DPAC image Strehl as best you can (I can tell you right now it will come in at ~.99 on both sides of focus).  Use the same physical distance associated with the green model to model the red and blue Strehl with AOS as best you can.  Then compare those AOS results to the Strehl curve published by AP. 

 

But I don't have to do that, as, after having a done a bunch of AOS modeling with my DPAC images from many refractors, I can say these 110GTX DPAC images are entirely consistent with AP's published Strehl curve.

 

IMO of course.

 

Jeff

[CreatorsHand]

Here are the inside of focus color montages, top to bottom, serial numbers 013, 027, 028.

 

Again, no real differences in secondary spectrum or spherochromatism with both very well controlled from blue to red.

 

I did not have the chance to star test serial numbers 013 and 028,  but, thanks to a very generous CNs member, I did spent several months with S/N 027.   It is superb in every regard with no coma, astigmatism or "CA" at any power I chose up to almost 250X.  Color balance/tone was quite neutral, clinical really.  And build and fit & finish were like you read about...and true(!).  I still miss it and one of these days, my name, I hope, gets drawn for my sample.

 

Jeff

Nice to see how these three early copies compare Jeff; thank you for doing such a nice job in putting these tests together and sharing the results. One of these days I need to get around to testing mine (#189, one of the last scopes in the second run) to see how it compares. My guess is it would fit right in with the rest.

 

Paul

 

edit: typo

Edited by CreatorsHand, 06 March 2025 - 11:33 PM.