Dual size focuser eyepeices?

[MarkyD]

I'm looking at getting a decent EP for my SW 200P-DS and have been looking at the Baader Hyperons which can fit both 1 1/4" and 2" focusers.  My thoughts are that with the extra length of the 1 1/4 fitment that this would make the benefits of having a 2" EP useless.  Am I correct in thinking this ie it would have the same properties as a 1 1/4" EP but fit in a 2" focuser without an adaptor.

I am mainly focusing on Astrophotography so I won't have a nest of EP's just one or more to go with the 28mm that came with the scope

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Mark

[Tinker1947]

The Hyperion EP are more suited to slow Scopes i will leave it to others to recommend a alternative other than Pentax and Televue which i have and can recommend but there a bit more expensive, Baader Click Lock Adapter is a worth while investment.

Televue

 http://www.telescopehouse.com/eyepieces/televue-eyepieces.html

Pentax

http://www.firstlightoptics.com/pentax.html

[Dave In Vermont]

Yes. A Baader Hyperion can be used in either a 2" or 1.25" focus-tube. To change it from one to the other requires removing, or adding, the adapters it comes with. So it will fit whichever you may have.

Very nice eyepieces! I have all but the 10mm & 24mm. These I have covered in others.

Have fun -

Dave

[rwilkey]

The Baader Hyperions do not suit fast scopes for visual work, as they get fuzzy at the edges.  Better to look at other ep's, there are many choices out there.

[Tinker1947]

15 minutes ago, Dave In Vermont said:

Yes. A Baader Hyperion can be used in either a 2" or 1.25" focus-tube. To change it from one to the other requires removing, or adding, the adapters it comes with. So it will fit whichever you may have.

Very nice eyepieces! I have all but the 10mm & 24mm. These I have covered in others.

Have fun -

Dave

I think you will find the 1.25" adapter also has a small lens and is required to get the advertised "mm", some time back i asked this question and that was the answer........

[MarkyD]

So as I understand it the 1 1/4" adapter is removable from the base of the EP leaving just the 2" in place?  This makes sense

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Mark

[Dave In Vermont]

The lower lens in the Hyperions doesn't change when you switch one for the other. 1.25" to 2." You are just exchanging parts of the eyepiece for fitting it into one or the other size focus-tube.

One gripe I have: The 2" adaptation won't give you the ability to screw in a filter for the 1.25" barrel. The threaded bore is removed when you swap the parts from 1.25" to 2."

Go figure,

Dave

[John]

3 hours ago, MarkyD said:

So as I understand it the 1 1/4" adapter is removable from the base of the EP leaving just the 2" in place?  This makes sense

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Mark

If you do this the eyepiece becomes a rather poorly corrected eyepiece of around 22mm.

With the exception of the 24mm, the 1.25" barrel contains a lens set which creates the operating focal length of the eyepiece so you leave it in place, even if you are using the 2" section to actually hold the eyepiece. The 2" barrel is simply a part of the body of the eyepiece that will fit into a 2" drawtube. It's not a replacement for the 1.25" barrel in the way that the Baader Hyperion Zoom works.

As has been said, Hyperions are not well corrected right across the field of view in scopes faster than about F/7. In slower scopes than that they work well though.

 

[MarkyD]

I'm glad you all mentioned about the issue with Baader Hyperions on a fast-ish scope.  I was sold on these because they look nice for the price   It's my birthday soon so I may hint at a slightly more expensive EP.  Any thoughts on the Explorer Scientific range?  My target is just to have three EP's - high, medium and my 28mm as a low

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Mark

[rockystar]

the Morpheus are very nice, and work well in my 200 f/5. One thing to note with dual fit barrels is that when used in 2" mode, they sit nearer the secondary, so you need more outward focus.

 

 

 

 

[michael.h.f.wilkinson]

The only dual-fit EP I have is the Nagler 12mm Type 4. The only use of the dual fit design is that I can switch it readily with the 2" 17mm Type 4, or Pentax XW 10mm which is 1.25". I tend to use it in 2" mode more, however,

[triton1]

The 2inch 28mm Maxvision is very good I paid about £84 for mine and it's sharp at f5

[emilslomi]

With the regular Hyperions and the Morpheus', you don't remove or exchange anything. The lower part of the eyepiece body is actually a 2" connector. You can pull them out of a 1.25" diagonal on one scope and immediately plug them into a 2" diagonal on the scope beside. You only change connectors for the Baader Aspherics and the Zoom.

 

Cheers, ES