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Celestron Skymaster 25 x 100 BINOCS

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#1 Benno

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Posted 06 April 2019 - 07:47 PM

Anyone out there using these? Can you explain the diopter setting numbers ??

They are different than any other binocs (even 100mms) that I've ever seen.

 

Thanks!

 

 



#2 Pinac

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Posted 07 April 2019 - 02:37 PM

Don‘t pay too much attention to those numbers.

 

I also wondered about them for a moment, but since I realized that I have to set a very different diopter setting on each of my 25x100 binos (Celestron Skymaster, Omegon NightStar, Omegon Argus), I gave up figuring out whether there is any reality behind them.

My experience:  In some high quality binoculars, you can actually use the numbers for real, but in most you cannot rely on them - or, as in the case of the Skymaster, you cannot rely on them at all.

 

Pinac


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#3 Rich V.

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Posted 07 April 2019 - 10:25 PM

The Celestrons appear to have their diopter scale markings on the prism housings rather than under the base of the eyepieces; perhaps a bit more convenient to see than most.  They also appear to have reverse (LH) helical threads compared to most binos.  On the Celestrons, turning the eyepieces CW moves the eyepieces outward (to the + side), the opposite of most binos I've seen which rotate CCW to focus closer (+).

 

I've noticed with a lot of inexpensive IF binoculars that the "0" diopter setting is pretty arbitrary.  Even with equal eyes, you may end up with one side at +1 and the other at -3.   tongue2.gif    When you get to the higher level binos like Fujinon, Nikon or KUO MS, they seem to be set more accurately.  You can always pull the outer eyepiece housing after you've set infinity focus for your eyes and put them back set at "0" if you like.  Then you'll conveniently know you have infinity set at 0 for your eyes.

 

Rich


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#4 Jawaid I. Abbasi

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Posted 08 April 2019 - 12:38 PM

Mine is also different but it works Optics are really good and well corrected (at least mine) which I did not expect in the price point.



#5 Benno

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Posted 08 April 2019 - 02:30 PM

Thanks very much guys! I wouldn't trade these for any other hand-held binos.

They are wonderful. I'm gonna go to rocket science school and figure out

how the diopter markings!

 

My eye Rx is (-1.25) OS and (-1.75) OD. I never wear glasses with any binos

and if the 25x100s had the regular diopter markings, it would be easy to set

them.

 

I do perform a test with stars and get the pinpoint to perfection and don't pay

any attention to the markings.

 

Thanks!



#6 Sean Wood

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Posted 18 April 2019 - 02:23 PM

I don't believe the diopter markings are really diopter markings. Without a general focus the independent eyepiece correction is really more like independent helical focuser. The focus will go almost a full revolution in each direction. With the "0" marks aligned you have about 4 mm focus in each direction.


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#7 Benno

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Posted 18 April 2019 - 02:51 PM

Thanks for all the comments! These are strange markings for sure.



#8 elmiko

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Posted 19 April 2019 - 08:58 PM

Hi Pinac, I occasionally check on this forum, I am mostly on the imaging forum. But I just saw your signature! OMG! You have every size binocular made? That is quite impressive! My favorite binos out of the 3 that I own are my Oberwerk 25x100 if Deluxe. I use them on a home made Parallelogram mount. 

Clear skies Mike



#9 Pinac

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Posted 20 April 2019 - 01:18 AM

......... You have every size binocular made? ......

.........

No way ... I tried to put together a representative selection of current sizes, but there are quite a few missing (e.g. 22x85, 20x100, 11x70, etc.etc.etc.)


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#10 elmiko

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Posted 20 April 2019 - 07:31 AM

Are you planning on getting those? Still an amazing collection!

Enjoy, Mike



#11 Pinac

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Posted 20 April 2019 - 03:24 PM

Are you planning on getting those? ......

Enjoy, Mike

Thanks!

No, I don‘t think so.


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#12 elmiko

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Posted 20 April 2019 - 04:18 PM

Back in the early 70's when I was a young boy I had a pair of Jason 7x50 binos. I bought them at a department store , I think it was LaBelles. I saved my allowance to buy them. I wish I would have kept them. The build quality was really good, possibly Japanese. I used to look at everything through those. Mountains and birds during the day, and the Moon at night.

That was back when you could still see the Milky way in the Phoenix area. Sad how light pollution is destroying the night sky.

Mike



#13 Benno

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Posted 13 May 2019 - 09:55 PM

OK, here's what I've experienced with the 25x100 Skymasters:

 

WITHOUT eyeglasses on: Rt. Eye, the "0" is on +1        Lt. Eye, the "0" is on +2.      

 

WITH eyeglasses on: Rt. Eye, the "0" is on (-.75).          Lt. Eye,  the "0" is on (+.5)

                                                                              

 

So, my eye Rx reads -1.75 in the Rt. eye

and the left reads -1.50. 

 

The diopter marks are correct, it's just they're not calibrated; most other binocs are.

 

Maybe I'm being a little "myopic" here but that's the way I see it -- no pun!!


Edited by Benno, 14 May 2019 - 08:07 PM.



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