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Meopta s2 82 hd + astro eyepieces (1 Viewer)

Racuuna

Well-known member
Hello!

I have been trying several different astro eyepieces for my meopta scope the last years. The astro eyepieces opens up new possibilities in an already fantastic scope.
For the moment i`m using a baader morpheus 12,5mm and a televue nagler 16mm. The baader is about 34x on the meopta and the televue is a 26x. The main big improvement over the original meopta okulars is the wide fov.
The nagler has a fantastic 82 degree fov but unfortunately the field stop on the 16mm is to large wich causes some vignetting in the outer 2-3% of the field. I found out that the fieldstop needs to be under 20mm to work properly on the meopta.
The baader is little different, with a fov of 76 degrees the image feels very large but not quite as big as the nagler. Still a lot bigger than the 30-60x with its 66 degrees
The morpheus got a fieldstop at 17mm so the field is sharp right out to the edges.
Meopta doesn`t build an astro adapter to their scope, at least i can`t find one.
I am using the adapter that meopta makes for the s2 scope for the s1 75 scope eyepieces. It is a perfect match for the 1,25" eyepices.
With a little finetuning you will get the eyepieces perfectly centered in the adapter. After that i`m taking little epoxy glue and permanently attach it to the adapter, with all the eyepieces i`ve tried so far it has worked perfectly.

The next project would be to try the more expanse eyepieces like the ethos with its 100 degree fov.

Would be interesting to hear others who is using astro eyepieces in spottingscopes and especially if someone have tried some of the eyepieces with 100 degrees and over.

I will attach some photos of the equipment.

Many thanks
 

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Racuuna,

By fine-tuning the adapter, what do you mean precisely? Do you have to sand or whittle away from the inside of the adapter to fit a 1,25" barrel, or do you need to build up to remove looseness? A picture of the inside of the adapter might be useful for those thinking of doing this.

Kimmo
 
Hello Kimmo!
Sorry for the insufficient info.
I've made it as simple as possible, since the hole in the adapter is bigger than the barrel of the eyepiece you bred to build up around it.
I'm using the front cap of the eyepiece to do so. By simply cut away the bottom of the cap and then press it down the adapter the space between adapter and eyepiece is eliminated.
Then hardly press down the eyepiece in the adapter and you will have it tight and centered in the adapter.
After that i just attach some glue or tape to make it fixed.
I Will add some photos.

Thanks
 

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Well done Racuuna. :t:

This means that Meopta could do easily an astro-adapter and increase their S2 sells...o:D
Someone with a CNC machine can also easily produce a tube with 1.25" inner hole diameter that fits the Meopta adapter, even including the thread of the S1 eps...

Can you please measure the diameter of the Meopta zoom at the place indicated by the yellow arrows? Just to see if I could adapt it to my Optolyth 100...

By the way, the vignetting of the Nagler 16 persists if you place the ep directly on the scope without the adapter? Might be the internal diameter of the adapter hole that is inducing the vignetting...

At http://www.pt-ducks.com/cr-telescopes.htm#Test%20of%205mm%20eyepieces you can see a 110º in a scope... ;)
 

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Hello David!
Measuring the meopta eyepiece it is about 42 mm att it's widest place.

It's great meopta made this adapter and it works really well. So far i've had no focus problem with any of the astro eyepieces i've tried in it.

To the nagler. Unfortunately it vignettes event whitout the adapter. The hole in the adapter is a Little bit larger than the naglers fieldstop.
Seems like the prism of the meopta Scope can't take that big fieldstop. I've seen the same result in an brunton epoch Scope.
But when attach to my Canon ef 400 5.6 with the adapter the nagler doesn't vignette, only to bad the image is upside down☺️

Ultra wide eyepieces is quite someting. Hard to go back once you tried them.
Can't help to think docter uwa 12,5 would be fantastic. Also the ethos 10 mm should work without vignetting in the meopta.
Maybe even a Takahashi 10 mm uwa could be considered interesting☺️
Thanks
 

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Hi,

seems there is a commercial one now... at least BH list one...


Joachim
And I have had it confirmed it is genuine Meopta part.

Lee
 
It arrived and looks nice. Came in a factory Meopta box, definitely OEM. Unfortunately I have not had a chance to test it yet.
 
What kind of eyepiece would you think would give wider and better AFOV then the 30-60 eyepiece.

At the low end in particular...
 
Hi,

the usual suspect would be the 24mm Panoptic or a clone, like 24mm 68 deg from Explore Scientifc with their fairly large field stop diameter of 27mm. Unfortunately that usually gets vignetted by too small prisms in spotting scopes. If it would work it would give 18x and 3.5 deg tfov.

If I calculate the field stop diameter for the wide zoom for the the low mag end, I get 19.5mm with the values of 2.55 deg tfov and 438mm (14.6mm*30) focal length.

tfov in deg = field stop diameter / objective focal length * 57.3

So one could try wide angle astro EPs with a field stop diameter between 19.5 and 27mm... like the ES 20mm 68 deg with a 22.8mm field stop - that would give 22x and a 3 deg field. But of course it might also be vigneted... depends on the prism size...

Another option migth be the 16mm Nagler with 22.1mm field stop for 27x and 2.9 deg tfov.

PS: somebody has already tried the 16mm Nagler and was geting vignetting... so the 19.5mm of the wide zoom is very close to the maximum...

Joachim
 
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I have a few ES and Pentax astro eyepieces that I use on my spotting scopes.
As far as ES 68*/24mm there is no vignetting on my 80mm Pentax but slight vignetting at the field stop on my 65mm Pentax. Eye placement is critical with this eyepiece as I feel that the eyecup is not tall enough. For astro use with my telescopes it does not seem as critical.
The ES 68*/20mm is fine, but again, wished the eyecup was just a bit taller. For this reason I prefer the Pentax XW 20mm for comfort and ease of eye placement.
I love using the ES 82*/14mm in both scopes, but it’s not as comfortable as my XW 14mm. The XW’s have 70 degrees of AFOV.
Oh, and another thing about both ES20 and ES24 eyepieces. They exhibit some pincushioning, but doesn’t bother me. The XW 20mm, very slight.
 

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What kind of eyepiece would you think would give wider and better AFOV then the 30-60 eyepiece.

At the low end in particular...
Hello! The eyepieces i have for my 82 meopta is baader morpheus 12.5 mm, 17.5 mm, 14 mm with 76 deg fov. I also has apm 13 mm and 5 mm with 100 deg fov. All of these works great on the scope with no vignetting.
 
What kind of eyepiece would you think would give wider and better AFOV then the 30-60 eyepiece.

At the low end in particular...
You zoom eyepiece already has a pretty wide AFOV. At the low end,the Pentax 20XW will give you 22x in your scope.
The Pentax 14XW, about 31x, but your zoom eyepiece already has that covered.

Check out the illustration to get a better idea of FOV’s between the two eyepieces for your scope.
 

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FOV‘s between Pentax 20XW and Baader Morpheus 17.5
 

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At the low end,the Pentax 20XW will give you 22x in your scope.
The 20XW with a 24mm field stop may not work as well on Meopta S2; I haven't tried myself but have read here [Edit: Racuuna in another thread] that anything larger than ~20mm starts to vignette. Your Pentax scope may be exceptional in this regard?
 
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The 20XW with a 24mm field stop may not work as well on Meopta S2; I haven't tried myself but have read here that anything larger than ~20mm starts to vignette. Your Pentax scope may be exceptional in this regard?
Hi,

for sure the Pentax 20XW works nicely w/o vignetting in all Pentax spotter bodies... as will all other XW series EPs with 1.25" tube.


In other brand bodies, not necessarily.

Joachim
 
The 20XW with a 24mm field stop may not work as well on Meopta S2; I haven't tried myself but have read here that anything larger than ~20mm starts to vignette. Your Pentax scope may be exceptional in this regard?
No, absolutely no vignetting on both 65 & 80mm Pentaxes with the 20XW.

But of course, Pentax designed their EP’s around their scopes, or was it the other way around?
 
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