Anyone selling 35mm adapter?

Aaron Shaw · October 16th, 2004, 03:20 PM

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)?

Richard Mellor · October 17th, 2004, 10:35 AM

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

Richard Mellor · October 17th, 2004, 10:44 AM

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

Anders Floe · October 17th, 2004, 11:06 AM

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.

Richard Mellor · October 17th, 2004, 11:22 AM

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

Giroud Francois · October 17th, 2004, 12:12 PM

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.

Richard Mellor · October 20th, 2004, 10:35 AM

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

October 17th, 2004, 10:35 AM	#17
Richard Mellor Major Player Join Date: Nov 2003 Location: cambridge ma Posts: 247	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

October 17th, 2004, 10:44 AM	#18
Richard Mellor Major Player Join Date: Nov 2003 Location: cambridge ma Posts: 247	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

October 17th, 2004, 11:22 AM	#20
Richard Mellor Major Player Join Date: Nov 2003 Location: cambridge ma Posts: 247	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

October 20th, 2004, 10:35 AM	#22
Richard Mellor Major Player Join Date: Nov 2003 Location: cambridge ma Posts: 247	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

October 16th, 2004, 03:20 PM	#16
Aaron Shaw Major Player Join Date: Jul 2004 Posts: 587	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)?

October 17th, 2004, 11:06 AM	#19
Anders Floe Regular Crew Join Date: Oct 2003 Location: Copenhagen Posts: 91	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.

October 17th, 2004, 12:12 PM	#21
Giroud Francois Inner Circle Join Date: Feb 2004 Location: switzerland Posts: 2,133	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.