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Teleconverter with microscope direct projection

 
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kit1980



Joined: 18 Aug 2016
Posts: 119
Location: Bellevue, WA, USA

PostPosted: Thu Feb 01, 2018 7:12 pm    Post subject: Teleconverter with microscope direct projection Reply with quote

I use Olympus OM-D E-M10 Mark II camera on a microscope in "direct projection" via extension tubes. It set up parfocally with the microscope's eyepieces.

The problem is that the image is a bit too small for the sensor: the camera field of view is significantly larger than with the eyepieces, and the image quality (sharpness and aberrations) degrades very significantly outside of the central part.

I'm thinking of buying an Olympus teleconverter to attach in front of the camera, so I get larger image and smaller field of view. Do you think it will work? Will the parfocality with the eyepieces be preserved?
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 18509
Location: Richland, Washington State, USA

PostPosted: Thu Feb 01, 2018 8:12 pm    Post subject: Reply with quote

Yes, this should work fine. From the standpoint of whatever optics you put in front of it, a teleconverter mounted on camera essentially just makes the sensor look smaller so it covers a smaller part of the optical image. Focus is not affected.

--Rik
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Pau
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Joined: 20 Jan 2010
Posts: 4157
Location: Valencia, Spain

PostPosted: Fri Feb 02, 2018 1:38 am    Post subject: Reply with quote

Take a look:
http://www.photomacrography.net/forum/viewtopic.php?p=146353#146353

I think that Waldo pwnell still uses this approach to take his wonderful photomicrographs, not sure.

http://www.photomacrography.net/forum/viewtopic.php?t=24814&start=0&postdays=0&postorder=asc&highlight=microscope+teleconverter
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enricosavazzi



Joined: 21 Nov 2009
Posts: 897
Location: Stockholm, Sweden

PostPosted: Fri Feb 02, 2018 4:38 am    Post subject: Reply with quote

As far as I know, there is only one teleconverter for Olympus Micro 4/3 (the 1.4x Olympus MC-14, see http://savazzi.net/photography/olymc-14.html ). It is good but expensive, and optimized for long focal lengths (primarily the 300 mm prime and the 70-150 mm zoom). It cannot be attached to most other Micro 4/3 lenses, but an empty Micro 4/3 adapter without optics should not be a problem. I have used this teleconverter on Metabones Micro 4/3 adapters without problems. The bayonet itself is a standard Micro 4/3, no "funny business" extra lugs like in Nikon teleconverters.

It might be worth investigating whether a second-hand Olympus EC-14 teleconverter for 4/3 (not Micro 4/3) plus a 4/3 to Micro 4/3 adapter can be significantly cheaper. See for example http://savazzi.net/photography/olympus50-200.html . In this case, you need a 4/3 (not Micro 4/3) adapter on the microscope photo tube.

It may also be worth considering a teleconverter for APS-C Nikon or Canon DSLRs (the Kenko ones are regarded as good enough for most uses, and certainly cheaper than Olympus ones) with suitable adapters. Image resolution through a microscope is usually lower than what the camera sensor can record, so I would not be too concerned about aberrations introduced by the teleconverter.
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Pau
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Joined: 20 Jan 2010
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Location: Valencia, Spain

PostPosted: Fri Feb 02, 2018 7:43 am    Post subject: Reply with quote

The 4/3 sensor has 21.6 mm diagonal. This is close enough to the field number of most objectives and eyepieces to do not produce vignette, so maybe the trinocular photoport or adapter could be limiting the field. Also you may be aware that many microscope objectives do need eyepiece complementary correction of objective aberrations "compensating eyepieces", if it's the case direct projection is not a good idea
In general 1.2 - 1.3X secondary magnification is to be recommended for 4/3 sensors with non wide field microscopes.

What microscope, objectives and adapter do you use?. Pictures would help to understand the issue.
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