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Old October 16th, 2004, 04:20 PM   #16
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Forgive my lack of knowledge but what is the plano-convex lens for? And if I understand you correctly you are placing it AFTER the GG (ie between the GG and camera)?
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Old October 17th, 2004, 11:35 AM   #17
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static adapter

hi everyone the adapter that james web made and mine are about the same. I think he used two condenser lens if you can find a 50mm plcx with a focal length as close to 50mm you will only need one. mine was something like a60mm fl and I don't know what he used for ground glass. but I would say the adapter I built equals or betters the setup used in the movie . life against memory. I am looking foward to see the quality of the thorlabs 1500 grit ground glass. and building all of this in the stackable lens tubes. from the advice of others the plcx needs to be as close to 50mm fl length and it needs to fit right on top of the ground glass my filter ring set up won,t allow me to get the lens perfect. about 1 or 2 mm above the ground glass. my hope is the stackable will allow the lens to fit directly on the ground glass and also fine tune the exact distance needed from the cannon 50mm and the focal plane of the ground glass I am starting to
learn after my fifth device. that all of this must be able to maintain tolerences of less than 1mm. after all we are trying to build a camera lens
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Old October 17th, 2004, 11:44 AM   #18
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statis adapter

this is link to optmo sigma ground glass

http://www.optosigma.com/miva/merchant.mv?Screen=PROD&Store_Code=OS&Product_Code=pg211&Category_Code=Filters+%26+Apertures




I am sure if you build a static adapter with this glass you will have a device at least equal to the one used in james webb movie. I will let everyone know next week how the thorlabs 1500 ground glass looks
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Old October 17th, 2004, 12:06 PM   #19
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Has anyone tried any of these GG???

http://www.satinsnowglass.com/

http://www.intenscreen.com/products.htm

They have very fine grain and can perhaps save an f-stop.
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Old October 17th, 2004, 12:22 PM   #20
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static adapter

the satin glass company sounds great . this is a link to the glass I ordered. it also says something about not sandblasting.


http://www.thorlabs.com/ProductDetail.cfm?&DID=6&ObjectGroup_ID=1132&Product_ID=36121
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Old October 17th, 2004, 01:12 PM   #21
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finally , if you browse all the products offered by thorlabs, you can build a 35mm adapter just by ordering parts and screwing them together.
the only drawback being the price, because it is hitech equipment.
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Old October 20th, 2004, 11:35 AM   #22
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static adapter

this is a still with the static adapter made from filter rings .
with 1500 ground glass and a 60mm fl 50 mm plcx. the plcx was about 3mm away from the ground glass. could not get sharp focus.
liked the shallow dof . will build next one in thorlabs tube system
the camera is a 8 year old one chipper.

http://www.dvinfo.net/media/mellor/PDVD_540.BMP
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