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Thread: Olivon 1.25/2 eyepieces

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    Default Olivon 1.25/2 eyepieces



    1136E1E8-1939-41E2-A652-6A1D9C46C77E.jpeg
    This may be a stupid question, but wondering if anyone has experience with these. I️ just received the first of two of these EPs I️ ordered. I️ upgraded the diagonal on my refractor to 2 and Im excited to be using the nicer pieces. But Im confused about the way these are built. Isnt the whole point of 2 pieces getting more light in? I️ have seen other dual 1.25/2 EPS where the 1.25 piece screwed into the bottom to use in the smaller focuser or diagonal. These are the opposite. There is a 1.25 lens, with a wider 2 metal piece that screws around them to make them fit in 2 mountings. Doesnt that defeat the purpose? Have I️ completely misunderstood how these work? Any owners have an opinion?
    PS sorry for the idiotic autocorrect issue, hope they fix it soon
    Properly collimated cornea-lens-vitreous optical apparatus, projecting on retinal sensor slightly limited by deuteranomaly, feeding through stock optic nerves into functional primary cortex, processed through frequently misfiring and buggy integrative cortex.
    Other instruments: Skyline 8" Dobsonian; Celestron Omni XLT 120 w upgraded focuser and diagonal on Stellarvue M2C mount; Oberwerk 25x100 IF; Celestron SkyMaster 8x56. Main EPs: ES 82 24mm and 11mm, Celestron Luminos 19mm, Meade UWA 14mm, Meade HD-60 6.5mm. Filters: UHC, 13%, blue. Finders: RACI, Telrad, RDF, reticle.

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    Default Re: Olivon 1.25/2 eyepieces

    Any dual 1.25/2" eyepiece is going to be limited by the 1.25" part of the barrel. If you screw in the 1.25" makes no difference. The field stop limits the TFOV of the eyepiece.

    For instance the Baader Hyperion asperics I used to have had the 1.25" piece screw in as you described. That also cut the TFOV. The field stop went from 44mm to 32mm cutting the field of view.

    I don't have the Olivons but it looks right. You can see that the field lens is much smaller than the barrel so it's not going to make a difference. On your eyepiece. When you screw in a 1.25" adapter it can cut the field, depending on the design. On yours, as pictured, it won't cut the FOV since the field lens is small.
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    Default Re: Olivon 1.25/2 eyepieces

    So, is there an advantage to a wider field lens? Are pieces with a different design, ie 2” with the option to screw in a 1.25 piece (as opposed to a 1.25 around which you can put a piece of metal just to fit into the 2” mirror like the one here) better? Or is the amount of light and the optical outcome the same? I’m still enjoying the much wider eye end of the EP and it really seems like a solid piece of equipment. I️ think that paying what I️ paid for this one is limited to the “dual” EPs (if one wants 2” pieces).
    Properly collimated cornea-lens-vitreous optical apparatus, projecting on retinal sensor slightly limited by deuteranomaly, feeding through stock optic nerves into functional primary cortex, processed through frequently misfiring and buggy integrative cortex.
    Other instruments: Skyline 8" Dobsonian; Celestron Omni XLT 120 w upgraded focuser and diagonal on Stellarvue M2C mount; Oberwerk 25x100 IF; Celestron SkyMaster 8x56. Main EPs: ES 82 24mm and 11mm, Celestron Luminos 19mm, Meade UWA 14mm, Meade HD-60 6.5mm. Filters: UHC, 13%, blue. Finders: RACI, Telrad, RDF, reticle.

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    Default Re: Olivon 1.25/2 eyepieces

    Normally they do the twin barrel as a convenience so as not to have to be switching out adapters for 1.25" eyepieces.
    Usually when they are made like this it is essentially a 1.25" eyepiece though some do have larger field stops that can vignette by the smaller barrel as nFA stated.
    The field lens size is determined by the eyepiece design. Widefields will normally have a wider eye lens than a narrower AFOV eyepiece like a Plossl.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
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    Default Re: Olivon 1.25/2 eyepieces

    A wider field lens can support a wider field stop and a wider true field of view. Screwing in a 1.25" piece can make a new narrowed field stop like with the Baader aspheric design. The particular Olivon you've shown in your picture doesn't look like it has that problem, performance should be the same, IF you've got the 1.25/2" 70 degree ultra wides. The longest focal length I see in that series is 17mm so the 1.25" tube is acting as the field stop and the 2" tube is optically irrelevant, it's just a built in 2" adapter.
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    Default Re: Olivon 1.25/2 eyepieces

    So, it sounds like this is essentially a 1.25 EP, with an adaptor to fit into 2" diagonals or tubes. To clarify, I am NOT interested in the 1.25 part, this was just on the cheaper side of 2" EPs when I was looking for them. I also tried briefly a Celestron Ultima Duo EP, which had the *other* dual design, meaning it was a 2" field end, with the option to screw in a 1.25" adaptor. So, was that a better option, from the standpoint of a using them in a 2" diagonal? Or does it not matter at this focal length? The eye end of the piece is nice and wide and the eye relief is good, so it does fit that purpose. Sorry for the clueless questions.
    Properly collimated cornea-lens-vitreous optical apparatus, projecting on retinal sensor slightly limited by deuteranomaly, feeding through stock optic nerves into functional primary cortex, processed through frequently misfiring and buggy integrative cortex.
    Other instruments: Skyline 8" Dobsonian; Celestron Omni XLT 120 w upgraded focuser and diagonal on Stellarvue M2C mount; Oberwerk 25x100 IF; Celestron SkyMaster 8x56. Main EPs: ES 82 24mm and 11mm, Celestron Luminos 19mm, Meade UWA 14mm, Meade HD-60 6.5mm. Filters: UHC, 13%, blue. Finders: RACI, Telrad, RDF, reticle.

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    Default Re: Olivon 1.25/2 eyepieces

    Quote Originally Posted by rocdoc View Post
    So, it sounds like this is essentially a 1.25 EP, with an adaptor to fit into 2" diagonals or tubes. To clarify, I am NOT interested in the 1.25 part, this was just on the cheaper side of 2" EPs when I was looking for them. I also tried briefly a Celestron Ultima Duo EP, which had the *other* dual design, meaning it was a 2" field end, with the option to screw in a 1.25" adaptor. So, was that a better option, from the standpoint of a using them in a 2" diagonal? Or does it not matter at this focal length? The eye end of the piece is nice and wide and the eye relief is good, so it does fit that purpose. Sorry for the clueless questions.
    It depends. At this focal length the Olivon looks perfectly OK. On the Celestron I'd have to look at the design to see if the screw in cut the field down further. At this focal length it's likely the same as the Olivon. But I can't say for sure. Compare the size of the field lens of the Celestron and see what the field stop looks like with and without the screw in. You'd want to be sure that the screw in didn't further cut down the field stop.

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    Default Re: Olivon 1.25/2 eyepieces

    Quote Originally Posted by not_Fritz_Argelander View Post
    It depends. At this focal length the Olivon looks perfectly OK. On the Celestron I'd have to look at the design to see if the screw in cut the field down further. At this focal length it's likely the same as the Olivon. But I can't say for sure. Compare the size of the field lens of the Celestron and see what the field stop looks like with and without the screw in. You'd want to be sure that the screw in didn't further cut down the field stop.
    Thanks. Again, on the Celestron I was NOT using the screw in. I am not interested in the 1.25 utility, the question is whether this design is a limitation when using this piece as a 2" eyepiece.
    Properly collimated cornea-lens-vitreous optical apparatus, projecting on retinal sensor slightly limited by deuteranomaly, feeding through stock optic nerves into functional primary cortex, processed through frequently misfiring and buggy integrative cortex.
    Other instruments: Skyline 8" Dobsonian; Celestron Omni XLT 120 w upgraded focuser and diagonal on Stellarvue M2C mount; Oberwerk 25x100 IF; Celestron SkyMaster 8x56. Main EPs: ES 82 24mm and 11mm, Celestron Luminos 19mm, Meade UWA 14mm, Meade HD-60 6.5mm. Filters: UHC, 13%, blue. Finders: RACI, Telrad, RDF, reticle.

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    Default Re: Olivon 1.25/2 eyepieces

    Quote Originally Posted by rocdoc View Post
    Thanks. Again, on the Celestron I was NOT using the screw in. I am not interested in the 1.25 utility, the question is whether this design is a limitation when using this piece as a 2" eyepiece.
    So then not a worry.

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    Default Re: Olivon 1.25/2 eyepieces

    Isn’t it a bit more complicated than that? I thought it had to do with the where the field stop falls for a particular scope, and that could decide whether having a narrower opening on the field end actually impacts the quality. If it makes a difference, I can always spring for a different design piece. Although I have to say I’m not seeing many true 2” EPs in this range of focal length.
    Properly collimated cornea-lens-vitreous optical apparatus, projecting on retinal sensor slightly limited by deuteranomaly, feeding through stock optic nerves into functional primary cortex, processed through frequently misfiring and buggy integrative cortex.
    Other instruments: Skyline 8" Dobsonian; Celestron Omni XLT 120 w upgraded focuser and diagonal on Stellarvue M2C mount; Oberwerk 25x100 IF; Celestron SkyMaster 8x56. Main EPs: ES 82 24mm and 11mm, Celestron Luminos 19mm, Meade UWA 14mm, Meade HD-60 6.5mm. Filters: UHC, 13%, blue. Finders: RACI, Telrad, RDF, reticle.

 

 
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