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New APM zoom eyepiece 7.7mm-15.4mm , 75° Constant FOV

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139 replies to this topic

#1 APM M.Ludes

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Posted 27 February 2021 - 08:56 AM

New APM zoom eyepiece 7.7mm-15.4mm , 75° Constant FOV is in progress to be used with normal Telescopes and spotting scopes and we will offer them fix installed in our big Binoculars :-)

 

expect a sales Price as our 12.5 mm 84  degree eyepiece

 

 

Attached Thumbnails

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  • 7.7-15.4mm.png

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#2 Second Time Around

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Posted 27 February 2021 - 09:06 AM

Looks very interesting! Will it accept a Dioptrx?
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#3 Astrojensen

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Posted 27 February 2021 - 09:15 AM

Oh, that looks pretty interesting! 

 

 

Clear skies!

Thomas, Denmark



#4 junomike

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Posted 27 February 2021 - 09:50 AM

Little advice, add F/L's along with the "X" as people like to know what F/L and magnification they're at.


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#5 PEterW

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Posted 27 February 2021 - 11:14 AM

Click stops could make setting both eyes the same more easy. With that field of view it’s going to challenge the conventional spotting scopes and other zooms out there... can’t wait for people to test these out.

Peter
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#6 spongebob@55

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Posted 27 February 2021 - 11:18 AM

What will the eye relief be?

 

SB


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#7 oldmanrick

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Posted 27 February 2021 - 11:52 AM

Also would like to see a version with standard 1.25" and/or 2" shaft to fit APM and other collet type helical focusers for use on their BTs.

 

Rick


Edited by oldmanrick, 27 February 2021 - 11:53 AM.

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#8 ihf

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Posted 27 February 2021 - 02:00 PM

Can these be fix installed in the MS/ED series? This would give a zoom range of 20-40x80 or 25-50x100. (Assuming these eyepieces are flat enough for f/4 optics and have good eye relief.) What would the benefit be in your view of fix installing them in the 45/90 degree binos? I assume weight/cost reduction due to simpler holders and smaller prisms? I would imagine this could be attractive to increase the portability of the 70mm/45' but I am not sure there is a convincing benefit for larger and 90 degree configurations?



#9 PEterW

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Posted 27 February 2021 - 02:41 PM

I still want to use the 24mm, but having 15-7mm without having to change could he handy.

Peter
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#10 scotsman328i

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Posted 27 February 2021 - 09:01 PM

What will the eye relief be?

 

SB

The specs say 18mm-20mm across the board.


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#11 range88

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Posted 27 February 2021 - 10:09 PM

Who's the desinger?



#12 betacygni

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Posted 28 February 2021 - 12:56 AM

Just to add to the questions, do we have a diameter on them at the eyecup? Would love a pair of these for the binoviewers, but looking at the pictures not sure my prominent nose would agree. The baader zooms without any eyecups is pretty much my max diameter.

#13 APM M.Ludes

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Posted 28 February 2021 - 05:34 AM

I am getting all questions answered soon.

 

I also recomment to change the upper eyepiece part into conical shape to allow our Nose to go in between :-)

 

The designer is from UO


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#14 Voyager 3

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Posted 28 February 2021 - 05:43 AM

Oh looks like a Leica asph and sounds like a Leica asph cool.gif .


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#15 Tyson M

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Posted 28 February 2021 - 09:08 AM

These eyepieces look like a perfect match for the APM binoculars. Just need a pair of 24UFF's and these zooms and you're golden.


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#16 spongebob@55

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Posted 28 February 2021 - 11:28 AM

The specs say 18mm-20mm across the board.

That would be great if it's 'effective' eye relief.........  thanks.

SB


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#17 25585

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Posted 28 February 2021 - 12:51 PM

New APM zoom eyepiece 7.7mm-15.4mm , 75° Constant FOV is in progress to be used with normal Telescopes and spotting scopes and we will offer them fix installed in our big Binoculars :-)

 

expect a sales Price as our 12.5 mm 84  degree eyepiece

Viewing end photos with eyecups both up and down please Marcus.



#18 Gastrol

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Posted 28 February 2021 - 12:59 PM

Seems like perfect usable range for my spotting scopes which take1.25” astro EP’s...



#19 shohin

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Posted 28 February 2021 - 02:06 PM

Is this eyepiece designed to work well with faster scopes such as an F5 dob?


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#20 APM M.Ludes

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Posted 01 March 2021 - 08:39 AM

Please note : I have no sample for testing in hand and I have required a few mechanical changes

 

it will take a while to get one for testing.

 

all other eyepieces designed for our fast Apo Binoculars so far working very well in Dobsonians


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#21 Phillip Creed

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Posted 01 March 2021 - 01:57 PM

I'd be curious to see where the final price ends up, but if it's reasonable, this is a real game changer it's specifically designed for astronomy.  Many terrestrial spotting scope zooms that get repurposed for astro use tend to have EOFB due to lack of blackened lens edges.  Astro-intended zooms tend to have a 3:1 focal length range but narrow AFOV's at the higher focal length ranges.

I like the focal length spread on this as well.  The exit pupil will work well in both dobs and many f/6 - f/8 refractors.  It's not much more AFOV vs. the Baader Zoom around 8mm, but it's way, WAAAAY more at ~15mm focal length.  The Baader doesn't go appreciably above 60° until one's already below 12mm.

Clear Skies,

Phil



#22 Starman1

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Posted 01 March 2021 - 06:02 PM

What I fear is that the optical prescription will end up like other spotting scope-specific eyepieces and have substantial angular magnification distortion

to control the rectilinear distortion spotting scope users won't accept.

That would make them less appropriate for astronomical use.


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#23 Phillip Creed

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Posted 02 March 2021 - 10:52 AM

What I fear is that the optical prescription will end up like other spotting scope-specific eyepieces and have substantial angular magnification distortion

to control the rectilinear distortion spotting scope users won't accept.

That would make them less appropriate for astronomical use.

Don,

Isn't that what bedeviled the Meoptra Zoom?  I think that had a similar focal length.

Anyhow, it'll be interesting to see how this bad boy does in fast dobs and refractors when it comes out.

Clear Skies,

Phil



#24 Deadlake

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Posted 03 March 2021 - 04:06 AM

Two questions:

 

1) Parfocal?

2) Undercuts?

 

Best wishes



#25 APM M.Ludes

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Posted 03 March 2021 - 05:21 AM

here more factory news , my questions and factory answeres

 

Some advises and questions

1, what ist he eyerelief from top of mechanic at different focal length ?
7.7mm: eyerelief is 18mm
15.4mm:eyerelief is 20mm

 

2, can you do again dual barrel 1.25“/2.“ Like on XWA eyepieces ?
Yes, similar to XWA 1.25 and 2” barrel

 

3, can you engrave for astronomy use the focal length and not the power on the eyepiece ?
Yes, our other zoom eyepieces are with focal length.7.7,8.7,10.2,12.2,15.4

 

4, can you design the top to accept the Tele Vue Astigmatism corrector called Dioptricx > https://www.televue...._page.asp?id=54 ? more details here > https://www.widescre...-corrector.html
This adapter should be easy to make, we plan to make this corrector on our eyepieces

 

5. Whats the body diameter ?
The diameter of the largest part (rubber grip) is 53.8mm, and the diameter of the remaining part is 53mm or so.

 

6. Will the new Zoom be parfocal on all length ?
It is parfocal at different focal length.

 

 

7. If you can do the eyeside with a conical shape you will increase very much the sales
1.25”barrel is straight, the top shape is conical like XWA
If you can do click stop zoom you gain another better sale
It's a little bit complicated and difficult to add to this device

 

The eyecup is similar to the 12.5eyepiece, fold-up.
We have designed two product style, the right one looks very nice.

 

Zoom.jpg


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