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by Graham Stabler
Thu Jan 08, 2009 7:31 am
Forum: Equipment Discussions
Topic: Eye pieces
Replies: 3
Views: 1669

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Graham
by Graham Stabler
Thu Jan 08, 2009 4:25 am
Forum: Equipment Discussions
Topic: Eye pieces
Replies: 3
Views: 1669

Eye pieces

I've got a Nikon SMZ-10 stereo microscope currently with 10X eye pieces. I could do with some more magnification so would like to get hold of some 15 and/or 20X eye pieces. I'm talking to Nikon but I think they would prefer to sell me a new microscope (and part of me would like to buy one). But if I...
by Graham Stabler
Tue Dec 30, 2008 5:59 am
Forum: Equipment Discussions
Topic: Can 63mm f3.5 El-Nikkor be "hacked" to f2.8?
Replies: 13
Views: 4086

While you are at it replace the iris with a liquid crystal and have some real fun :)

Graham
by Graham Stabler
Fri Dec 26, 2008 11:49 am
Forum: Equipment Discussions
Topic: What is this Schneider?
Replies: 45
Views: 10692

It's sold under a lot of names, in the UK Polymorph is a popular one. You can often find it on ebay sold under lots of names. Its very good stuff, a little like nylon but more chewy. With some inventiveness you can make interesting parts, I made a spring by rolling it out into a long sausage before ...
by Graham Stabler
Wed Dec 24, 2008 5:41 pm
Forum: Equipment Discussions
Topic: What is this Schneider?
Replies: 45
Views: 10692

by Graham Stabler
Thu Dec 18, 2008 6:53 pm
Forum: Equipment Discussions
Topic: Stereo macro with one shot
Replies: 11
Views: 3541

I have found a source of in expensive Fresnel prisms to recreate the biprism type stereo. http://www.west-op.com/pressonprism.html These sticky back prisms are made by 3M to correct for some eye problems such as double vision. They come in a variety of strengths too so I hope to work out which one I...
by Graham Stabler
Thu Dec 18, 2008 3:13 am
Forum: Equipment Discussions
Topic: Stereo macro with one shot
Replies: 11
Views: 3541

One other thing I was going to say is that if anyone fancied trying a programmable aperture they could make the mask as a large disk with the apertures around the circumference. This could be laser cut very cheaply (in fact I have a laser cutter so would be happy to help any experimenter) and would ...
by Graham Stabler
Thu Dec 18, 2008 3:11 am
Forum: Equipment Discussions
Topic: Stereo macro with one shot
Replies: 11
Views: 3541

Craig, thanks that's a bit easier on peoples connections than the video on their website. Tardigrade37, thanks for the reference! For my stereo I am going to try a bi-prism in front of the lens, I'm having trouble finding one of these so I'm going to use two Fresnel prisms back to back. As has been ...
by Graham Stabler
Tue Dec 16, 2008 6:56 pm
Forum: Equipment Discussions
Topic: Stereo macro with one shot
Replies: 11
Views: 3541

After thinking more about the first system, the "light field camera" I realised that for stereo I would just need an array of cylindrical lenses, much like are used to create lenticular holograms but with a longer focal length to account for the cover glass of the sensor. This was confirmed in anoth...
by Graham Stabler
Tue Dec 16, 2008 5:05 am
Forum: Equipment Discussions
Topic: Stereo macro with one shot
Replies: 11
Views: 3541

And check this out:

http://uk.youtube.com/watch?v=8ENfPYpkHp4

They use a programmable aperture to capture the light field for a similar result. No use to me but very interesting and note their simple first attempt.

Graham
by Graham Stabler
Tue Dec 16, 2008 3:23 am
Forum: Equipment Discussions
Topic: Stereo macro with one shot
Replies: 11
Views: 3541

This is very interesting:

http://www-graphics.stanford.edu/papers/lfcamera/

You stick a micro lens array in front of the sensor and that allows stereo to be produced digitally and it even allows extended depth of field etc. There is a tech report and if you have big "pipes" a large video.

Graham
by Graham Stabler
Mon Dec 15, 2008 8:16 am
Forum: Equipment Discussions
Topic: Stereo macro with one shot
Replies: 11
Views: 3541

They just sell the non-macro version of the device I posted above as far as I can tell.

Graham
by Graham Stabler
Mon Dec 15, 2008 6:35 am
Forum: Equipment Discussions
Topic: Stereo macro with one shot
Replies: 11
Views: 3541

Stereo macro with one shot

I've been taking high speed macro video for a while now and recently the people I borrow the camera from have upgraded to a Phantom V12 which has almost twice the sensor size and identical pixel size. I wondered about trying to do some form of stereo macro, capturing both frames on one sensor. I fou...
by Graham Stabler
Fri Dec 12, 2008 3:24 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Pasteur pipets
Replies: 7
Views: 2048

They look amazing, as if they would go on forever.

Graham
by Graham Stabler
Thu Dec 04, 2008 9:08 am
Forum: Equipment Discussions
Topic: Volpi fibre optic light
Replies: 12
Views: 9236

Rik, The PL800 does indeed have an iris and yes it does use an EKE21V150 bulb. I just bought a stack of spares, not from Edmund of course, they seem to have a X2 pricing policy. Another thing I noticed that these bulbs look almost identical to the sorts of things you buy for your kitchen only with t...