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Thread: Nikon CFI 10x/22 oddball 25mm

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    Default Nikon CFI 10x/22 oddball 25mm



    Nikon CFI 10x/22

    IMG_5350.jpg

    Shown with an aluminum 1.25" adapter.



    This is Nikon's 10x/22 CFI Eyepiece lens, and it is designed to fits the Nikon Eclipse and Ci series microscopes.

    Focal length = 250/10 = 25mm
    Field stop = 22mm
    Barrel width = 30mm, a common microscope barrel size. It requires my adapter.
    Nikon Part Number - MAK10100
    This particular EP has a built in diopter, this is useful for back focus considerations.

    FOV - unknown - but as tested it in my refractor, I think it offers widefield views perhaps a wider FOV than a plossl, perhaps similar to an ES82.

    Eye relief - generous, but again, unknown.

    More pics:

    Diopter rotated down
    IMG_5352.jpg

    Diopter rotated up
    IMG_5353.jpg

    A look through the EP
    IMG_5355.jpg

    Field test: In a slow refractor (f15), I used this EP to mark M93 and the Trapezium. Beautiful views with marked contrast and wide FOV. This slightly outperformed my Meade Super Plossl (better relief) and ES82 (better contrast). In terms of contrast the only other EP in my collection that beats it is the Leitz Periplan GF. The eye relief is great, and there is absolutely no kidney-bean effects.

    Thanks for reading to the bottom!

    I include this final Figure for the purpose of my own reference.

    1.
    eyepiece.png

    Reference
    1. http://www.telescope-optics.net/eyepiece1.htm
    Last edited by kanadalainen; 02-11-2018 at 04:28 PM.
    Ian
    Scopes Celestron - Vixen 80 f11.3 on a Vixen alt/az mount and an Orion dob XT10i f4.7
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    Eyepieces: Leitz Periplan GF, ES68s, ES82s, TV Naglers, Meade 4000 super plossl, Nikon CFI, Olympus FK, Paracorr I, Abbe Orthos: Carl Zeiss Jena K7x (35mm), K10x (25mm)
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    Default Re: Nikon CFI 10x/22 oddball 25mm

    Hello Ian,

    and thank you for the great report with pics!
    As Nikon is one of the leaders in microscopy, their eyepieces are of course of interest.
    The first thing I have noticed is the convex-out eye lens, it looks like to be the case in your 2nd and 3rd pic.
    This reminds me of the (2-1) Carl Zeiss STEMI eyepieces.
    If that's the case, then you may expect brighter views than through the other eyepieces with more lenses inside.
    It would be great if you could make ray tracing with a laser pointer.

    Another make from Japan with nice eyepieces is Olympus. We don't see much microscopy optics from Japan here, everything is Leitz/Leica, Reichert, Zeiss, Wild, so there is not much to compare with.

    Looking forward to the first light report from you,

    JG
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    Default Re: Nikon CFI 10x/22 oddball 25mm

    Great info! Thanks for the write-up, Ian. I've seen these when browsing around, but didn't know enough about them to make a knowledgeable conclusion. I do know the Nikon reputation for quality though. I wish there were some calculations that could easily figure the AFOV of these pieces.
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    Default Re: Nikon CFI 10x/22 oddball 25mm

    Quote Originally Posted by SpyderwerX View Post
    Great info! Thanks for the write-up, Ian. I've seen these when browsing around, but didn't know enough about them to make a knowledgeable conclusion. I do know the Nikon reputation for quality though. I wish there were some calculations that could easily figure the AFOV of these pieces.
    AFOV = 2* arctan(22/2*25) = 47.5°

    22 is the EP field number in mm
    25 = 250/10 is the EP focus in mm
    10 is the EP magnification factor

    10x/22 is what is engraved or painted on the microscope EP

    Best,

    JG
    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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    Default Re: Nikon CFI 10x/22 oddball 25mm

    Quote Originally Posted by j.gardavsky View Post
    AFOV = 2* arctan(22/2*25) = 47.5°

    22 is the EP field number in mm
    25 = 250/10 is the EP focus in mm
    10 is the EP magnification factor

    10x/22 is what is engraved or painted on the microscope EP

    Best,

    JG
    Wow!! Thanks JG, this is great info in calculation of the FOV.

    I was wrong, this EP is very much like a Plossl with respect to FOV. These EP's do not command any mighty prices, but as I tried to convey, they have outstanding contrast. The weather looks good this evening, so I may try it in both a newtonian and my refractor again.


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    Ian
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    Default Re: Nikon CFI 10x/22 oddball 25mm

    Quote Originally Posted by j.gardavsky View Post
    Hello Ian,


    It would be great if you could make ray tracing with a laser pointer.

    JG
    I put my laser collimation unit on the job. The first set of pics are the Leitz Periplan GF, as a control.
    I shot the laser through the base and out through the top of the ocular and took a pic of the dispersion, relative to the top of the EP.

    Leitz:

    Attachment 172796
    Attachment 172797
    Attachment 172798

    Now, the Nikon GFI:

    Attachment 172799
    Attachment 172800

    and projected on the wall at 4 or 5 cm:
    Attachment 172801

    I'm not sure if thats what you are looking for, JG.

    Regards,
    Ian
    Scopes Celestron - Vixen 80 f11.3 on a Vixen alt/az mount and an Orion dob XT10i f4.7
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    Default Re: Nikon CFI 10x/22 oddball 25mm

    Apologies....for some reason the images above were unreadable.

    Reposting...

    Leitz Periplan:

    IMG_5356.jpg

    IMG_5357.jpg

    IMG_5377.jpg


    Nikon:

    IMG_5363.jpg

    IMG_5374.jpg
    Ian
    Scopes Celestron - Vixen 80 f11.3 on a Vixen alt/az mount and an Orion dob XT10i f4.7
    Binoculars Asahi Pentax 7x35 and 7x50, Beck Kassel 8x30 and Celestron 15x70
    Eyepieces: Leitz Periplan GF, ES68s, ES82s, TV Naglers, Meade 4000 super plossl, Nikon CFI, Olympus FK, Paracorr I, Abbe Orthos: Carl Zeiss Jena K7x (35mm), K10x (25mm)
    M110: 110 Herschel 400: 90 Comets: 2 Planets: 6

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    Default Re: Nikon CFI 10x/22 oddball 25mm

    Thanks Ian for the laser ray tracing pictures!

    JG
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    Default Re: Nikon CFI 10x/22 oddball 25mm

    Most welcome JG.

    I would be very interested to hear your interpretation of the data.
    THe Nikon ray trace is out of focus, and I can redo that.
    Ian
    Last edited by kanadalainen; 02-12-2018 at 04:10 PM.
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    Ian
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    Default Re: Nikon CFI 10x/22 oddball 25mm

    February 11, 2018

    First light - Nikon GFI

    Temp: -24*C
    Backyard
    Target: Trapezium
    Seeing: Good
    Transparency: Very good.
    Scope: XT10

    A few posts above, I mention the excellent results with a slow refractor. Great contrast, and the nebula of M42 is found in all her glory.
    Pinpoint sharpness of stars in the FOV.

    Now - I used this EP in my fast Newtonian. After an hour to cool, I found M42 and noted the Trapezium. The minor players were evident. When in the centre of the field of view, no coma is present. Out to the edge, there is some coma.

    I used my Paracorr I to correct this, and it worked nicely, removing the coma from the stars on the edge of the field.

    Barlowed, this EP is also an excellent performer. The details of the Triangulum sprang into view.

    Contrast - exceptional

    Regards,
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    Scopes Celestron - Vixen 80 f11.3 on a Vixen alt/az mount and an Orion dob XT10i f4.7
    Binoculars Asahi Pentax 7x35 and 7x50, Beck Kassel 8x30 and Celestron 15x70
    Eyepieces: Leitz Periplan GF, ES68s, ES82s, TV Naglers, Meade 4000 super plossl, Nikon CFI, Olympus FK, Paracorr I, Abbe Orthos: Carl Zeiss Jena K7x (35mm), K10x (25mm)
    M110: 110 Herschel 400: 90 Comets: 2 Planets: 6

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