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Old January 4th, 2005, 07:59 PM   #1
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35mm adapter parts list

Hi everyone

this is a list of parts to build the 35mm adapter:

http://www.bhphotovideo.com/bnh/cont...=116732&is=REG
http://www.thorlabs.com/ProductDetai...roduct_ID=1481

(2)http://www.thorlabs.com/ProductDetai...roduct_ID=1483


50mm 1500 grade : part number 099-0160http://www.optosigma.com/miva/mercha...+%26+Apertures

50mm 70fl :part number 011-2870http://www.optosigma.com/miva/mercha...herical+Lenses
you will need two step rings the size will be determined by your camera and the size of the c-mount adapter thread.


this is an example of a step ring
http://www.bhphotovideo.com/bnh/cont...u=11925&is=REG

completed adapter http://www.dvinfo.net/media/mellor/3...abs%20tube.jpg
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Old January 4th, 2005, 08:34 PM   #2
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Richard, I can't remember if you have used both the OptoSigma GG and Thorlabs GG but if you have which did you find to yield a brighter image?
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Old January 4th, 2005, 08:50 PM   #3
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I have used both. the opto sigma is better . the thorlabs glass even came with flaws.
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Old January 4th, 2005, 10:49 PM   #4
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I would like to see some video shot with this adaptor
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Old January 4th, 2005, 10:50 PM   #5
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EDIT: ^^^ beat me to it.

Do you have any test footage or even some stills from using this adapter?
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Old January 4th, 2005, 10:57 PM   #6
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Richard,

Congrats, That looks like a really pro unit and like the others some stills or footage would be great.
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Old January 5th, 2005, 02:34 PM   #7
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coated

Is there any benefit to getting the coated 50mm 70fl?
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Old January 5th, 2005, 03:22 PM   #8
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Better contrast and light transmittance
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Old January 5th, 2005, 04:15 PM   #9
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Many thanks Richard, that's very usefull.

Can U please post some pictures of the parts inside the thorlabs tube (or just a bigger one like this already posted) ??

Tnx again for the infos.
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Old January 5th, 2005, 04:36 PM   #10
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I started thinking about this while I was cutting the grass....this is really an impressive design since its completely modular. No glueing or taping..everything screws in...it seems like it would be easy to change the GG to anything should someone come up with a new breakthrough idea .

And all in all it costs only $170 to $200 depending on the lens mount and step ring you go with. Extremely impressive.

Can't thank you enough for this post Richard
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Old January 5th, 2005, 04:59 PM   #11
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Richard, how did you connect the c-mount to the tubing?
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Old January 5th, 2005, 06:16 PM   #12
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c-mount

this is a photo of the back of a c-mount you would just step from this thread to the 52mm tube . If you notice the back of the mount can be removed. the reason my adapter looks different is i removed the back and glued a step ring into the back.
I don,t want to recommend this I may have the alignment
to the lenses a little off . as the ring was a little smaller which may be causing some loss of focus.
If you build the tube. you could go to a camera shop and try all the rings you need to build this. the best part is the tube is 52mm
and standard camera parts will attach. http://www.adorama.com/VDCMCA.html
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Old January 5th, 2005, 07:21 PM   #13
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Wow. Most impressive. I'm a bit confused about the C-mount and C-mount adapter -- are both needed? Excuse my ignorance; I'm not knowledgable about still lenses. Also, any instructions on how to set up the lens and GG inside the tube, or is it just trial and error to get the focus correct?

Thanks,

Fox
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Old January 5th, 2005, 07:25 PM   #14
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Thanks for the info Richard. I wasn't aware that these mounts were threaded! I should have guessed!

The reason both the c-mount and c-mount adapter are used is because that's how you can buy them (I presume). I don't think it is possible to buy just (for instance) a nikon F mount with threads on the back.
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Old January 5th, 2005, 07:37 PM   #15
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when I was setting the focus with the ground glass I had
a failed attempt at making a homemade ground glass I used this to set the focus and then replaced with the opto sigma. maybe if you had a 50mm lens you could sand it good enough for focusing

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