Olympus CH-2

Craig Gerard · Post by **Craig Gerard** » Mon May 31, 2010 6:09 am

I've just taken delivery of an Olympus CH-2. It has been well maintained and serviced regularly. It's a beauitful thing!

I know it is not a BH or BH2; but I am impressed with what I'm seeing.

It is a binocular and I would like to put a trinocular head on it, then look at the various relay lenses, and associated requirements; etc, etc.....

Initially, are there any particular requirements I need to consider with regard to a trinocular outfit for the CH-2?

Learning curve ahead; but with what I am seeing it will be more than worth it.

Craig

Charles Krebs · Post by **Charles Krebs** » Mon May 31, 2010 10:21 am

Craig,

If you do not already have them, there are a few PDF's of Olympus material that will be of interest to you. They can be found here:
http://www.alanwood.net/photography/oly ... loads.html

Craig Gerard · Post by **Craig Gerard** » Mon May 31, 2010 7:37 pm

Thanks for the link Charlie.

Do the BH/BH2 and CH/CH2 have the same dovetail? Would a BH2 trinocular head fit the CH2?

Just thought I'd ask whilst researching myself.

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Some related links:
Olympus 2.5X NFK photo-eyepiece at 1.67X? The visualisation comparing different photo-eyepieces in the linked post is most helpful.

Some thoughts on selecting projection relay optics when using DSLR’s
(and other “lens-less” sensors) for photomicrography. Charles Krebs July17, 2006.
http://krebsmicro.com/relayDSLR/relayoptics1.html

Two Basic Methods for Photomicrography. Charles Krebs February 16, 2007 V1.0
http://krebsmicro.com/photomic1/photomic1.html

Can an Olympus NFK 2.5X be used effectively at a lower magnification? Charles Krebs
http://www.krebsmicro.com/NFK_lowermag/index.html

Craig

Charles Krebs · Post by **Charles Krebs** » Mon May 31, 2010 10:59 pm

Craig,

Yes, the older trinocular head (BH-TR45) and the more recent one for the BH2 series (BH2-TR30) use the same dovetail mount. (The older FH series heads mount differently). The BH-TR45 (at least all the ones I've seen) have a two position slider for directing the light... 100/0 and 20/80 ( percentage to eyepieces/camera). The BH2-TR30 has three positions 100/0, 20/80, and 0/100.

Craig Gerard · Post by **Craig Gerard** » Wed Jun 02, 2010 12:31 am

Charlie,

Thanks for the info!

BH2-TR30 is on its way.

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Here are more links to related discussions for reference.

Advice needed attaching Canon Mark II to Oly BHS Trinocular:
http://www.photomacrography.net/forum/v ... hp?p=53199

Advise on Microscope:
http://www.photomacrography.net/forum/v ... php?t=8069

Craig

Craig Gerard · Post by **Craig Gerard** » Tue Jun 15, 2010 2:22 am

The CH2 came supplied with the following objectives.

E A10 160/- NA: 0.25
A 20 160/0.17 NA: 0.40
E A40 160/0.17 NA: 0.65

Eyepieces are Olympus CWHK 10/18L.

If I was looking to upgrade the objectives (finite 160 tube length) which ones should be considered; DPlan or SPlan?

Craig