Cheap WF10X/23 eyepieces for 30mm eye tubes

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blekenbleu
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Cheap WF10X/23 eyepieces for 30mm eye tubes

#1 Post by blekenbleu » Tue Aug 02, 2022 4:54 pm

A Nikon UW head was listed without eyepieces;
since I use eyepieces mostly for finding and initial focus before switching to camera Live View,
30mm eyepieces with lowest price were ordered from OrangeConnex.com:
Image
https://www.ebay.com/itm/144013733860

With Nikon M Plan 210/0 objectives, which work OK without further corrections,
Image
I detect no aberrations. Field of view is at least 3mm larger than that from Leica 10x/21B,
which are not ideal for Nikon's UW head, since those Leica objectives have circular channels
intended to engage and clamp (with set screws) to thin rims on eye tubes.
The eBay listing title includes "Wild Field", which may confuse wide/wild
or that they are patterned after some Wild oculars?

Those wanting 30mm oculars for intense usage might gamble another US$10
for alternatives with adjustments and rubber eye guards, e.g.:
https://www.ebay.com/itm/254441689548
.. with microscopes not dependent on oculars to complete objective corrections.
Comparable oculars for 23mm eye tubes are discussed here:
viewtopic.php?f=14&t=10094

After cobbling together an afocal adapter, I'll append comparison images.
Metaphot, Optiphot 1, 66; AO 10, 120, EPIStar, Cycloptic

Scarodactyl
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Re: Cheap WF10X/23 eyepieces for 30mm eye tubes

#2 Post by Scarodactyl » Tue Aug 02, 2022 7:01 pm

That's a great price for 10x/23s. These generic eyepieces tend to be good on Nikon systems.

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blekenbleu
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Re: Cheap WF10X/23 eyepieces for 30mm eye tubes

#3 Post by blekenbleu » Tue Aug 02, 2022 9:12 pm

Scarodactyl wrote:
Tue Aug 02, 2022 7:01 pm
great price for 10x/23s
For that price, I would be willing to improvise a shim to equalize focus,
(since these lack any adjustment) but my eyes mismatch mostly for other than diopter.
I deliberately picked Nikon Optiphot-era BD and M plan for EPI microscopy
because of CF reputation among macro photographers,
but just got lucky that cheap new oculars work on AO 10-120 as well.

Unrelated dumb luck: A Tiffen series 6 filter adapter engages the nominal 44mm bottom thread
of a UW (or type T) trinocular chimney:
Image
.. and also clears prism slider hardware in UW head beneath it.
Metaphot, Optiphot 1, 66; AO 10, 120, EPIStar, Cycloptic

Sure Squintsalot
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Re: Cheap WF10X/23 eyepieces for 30mm eye tubes

#4 Post by Sure Squintsalot » Wed Aug 03, 2022 1:22 am

What's the difference, in terms of viewing experience between a 10x/23 made for 30mm tubes vs 10x/23 made for 23mm tubes and used with a 23mm-30mm adapter?

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Re: Cheap WF10X/23 eyepieces for 30mm eye tubes

#5 Post by Scarodactyl » Wed Aug 03, 2022 1:38 am

There aren't any 10x/23s for 23mm tubes. 10x/22 is as close as it gets (more like 10x/21.9 or so really). The look is similar to a 30mm 10x/22 but there's a bit of internal reflection on the inside of the tube on the 23.2mm version.

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Re: Cheap WF10X/23 eyepieces for 30mm eye tubes

#6 Post by apochronaut » Wed Aug 03, 2022 2:57 am

There are 23mm 12.5X that give the same f.o.v. as a 10X/20, so have an apparent field about the same as a 10X/25. They are quite neutral, about the same as AO 180 or Nikon CF . They have eyepiece diopters.

I find them useful to maximize N.A., somewhat.

edit; the apparent field on these is more like 22-23mm with a 25% increase in magnification. The field is large enough that you have to move your eyes quite a bit to view the periphery.
Last edited by apochronaut on Fri Aug 05, 2022 10:06 am, edited 1 time in total.

Scarodactyl
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Re: Cheap WF10X/23 eyepieces for 30mm eye tubes

#7 Post by Scarodactyl » Wed Aug 03, 2022 4:16 am

apochronaut wrote:
Wed Aug 03, 2022 2:57 am
There are 23mm 12.5X that give the same f.o.v. as a 10X/20, so have an apparent field about the same as a 10X/25. They are quite neutral, about the same as AO 180 or Nikon CF . They have eyepiece diopters.

I find them useful to maximize N.A., somewhat.
Ooh, those sound nice. I'd love to know more.

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Re: Cheap WF10X/23 eyepieces for 30mm eye tubes

#8 Post by apochronaut » Thu Aug 04, 2022 2:05 pm

I sent.

EYE C U
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Re: Cheap WF10X/23 eyepieces for 30mm eye tubes

#9 Post by EYE C U » Thu Aug 04, 2022 8:45 pm

MY 4.99 EYEPIECES ARE THE BEST..BOUGHT 5 MORE SETS THEN THE JACKED UP THE PRICE TO 40 BUCKS..

PeteM
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Re: Cheap WF10X/23 eyepieces for 30mm eye tubes

#10 Post by PeteM » Wed May 10, 2023 6:26 am

A set of (claimed and marked) 10x/24 eyepieces (30mm eye tube size) arrived today. The actual field of view is closer to 22mm at 10x; with those Chinese eyepieces available at a lower cost. It's 2+mm shy (at 10x) of an Olympus GWH10-CD.

Caveat emptor.

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Re: Cheap WF10X/23 eyepieces for 30mm eye tubes

#11 Post by Scarodactyl » Wed May 10, 2023 8:22 am

Bummer! Could you post a picture? I'm curious which style they were.

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Re: Cheap WF10X/23 eyepieces for 30mm eye tubes

#12 Post by imkap » Wed May 10, 2023 8:55 am

I bought the 10x/23 and they do have a bit wider field than GSWH10...

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Re: Cheap WF10X/23 eyepieces for 30mm eye tubes

#13 Post by PeteM » Thu May 11, 2023 9:39 pm

Scarodactyl wrote:
Wed May 10, 2023 8:22 am
Bummer! Could you post a picture? I'm curious which style they were.
Stephen - see pix below. From left to right, I did some field size comparisons using an Olympus SZH stereo scope and the Olympus WH10x/22 zoomed to exactly fit a 22mm field size. The eyepieces were then swapped in and out with no changes to the zoom setting.

22.0 mm FN Olympus__ WH10x/22 (used as a comparison standard to set field size to 22mm)
21.9 mm FN Chinese___ WF10x/22 (just barely under above field size)
23.5 mm FN Chinese___ WF10x/23 (first of two similar eyepieces, differing in marking size)
23.0 mm FN Chinese___ WF10x/23 (second of two 23mm FN imports)
22.5 mm FN Chinese__ WF10x/24 (or so it claims - construction is similar to the two above)
25.0 mm FN Olympus__ GWH10x-CD that's the OEM spec for the SZH

My scope has a dual-view intermediate piece used to hold a camera, which might slightly reduce the achievable field size. In addition, the 1x objective used for this is a Nikon on an adapter ring (with a higher numerical aperture at 1x than the Olympus) which could also slightly affect it. Thus, the zoom setting to get 22mm on the Olympus WH10x/22 was more like 9x than on the 10x marking (the scope has approximate zoom markings at 7.5x, 10x, 15x . . . 64x). All that said, the comparison should be valid, relatively speaking, since the zoom was kept constant.
.
.
EyepieceFieldsOfView.jpg
EyepieceFieldsOfView.jpg (121.89 KiB) Viewed 2811 times
SZH with intermediate piece.jpg
SZH with intermediate piece.jpg (92.85 KiB) Viewed 2811 times

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Re: Cheap WF10X/23 eyepieces for 30mm eye tubes

#14 Post by blekenbleu » Mon May 15, 2023 1:15 am

blekenbleu wrote:
Tue Aug 02, 2022 4:54 pm
After cobbling together an afocal adapter, I'll append comparison images.
I apologize for the delay; many distractions.
This first comparison uses a Canon 90D APS-C body, which crops the field.
I'll try again using a Canon 6D's 35mm sensor..
First surprise was discovering how problematic is focus using the LCD screen in Live View;
afocal DSLR lens https://blekenbleu.github.io/microscope/M48.htm over one eyepiece precludes using the other:
Triotar_UW_90D.jpg
Triotar_UW_90D.jpg (133.88 KiB) Viewed 2737 times
An HDMI monitor will be attached for the next batch...

Second surprise was change in focus from left to right;
presumably improvised stage for transmitted illumination is at fault; Optiphot-66 as received was EPI-only.

Third surprise was so many opportunities for debris with UW head, vertical illuminator and DIC nosepiece.

For reference, here is a trinocular image,
using a Triotar 1:4 13,5cm lens https://blekenbleu.github.io/Canon/#Triotar for semi-direct projection:
Triotar1.jpg
Triotar1.jpg (79.8 KiB) Viewed 2737 times
All are of the same calibration slide using BD Plan 210/0 20x/0.4 DIC with prism slider pulled.
Here is the WF10X/23:
WF10X-23b.jpg
WF10X-23b.jpg (81.72 KiB) Viewed 2737 times
Here is a Nikon D 10x/20 for another reference:
D10x-21.jpg
D10x-21.jpg (82.74 KiB) Viewed 2737 times
Surprise #4 was magnification difference between Nikon D 10x/20 and OrangeConnex WF10X/23
if one is truly 10x, then the other is either 8.8x or 11.3x
Metaphot, Optiphot 1, 66; AO 10, 120, EPIStar, Cycloptic

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