Making a Zone Plate

[DPVisions]

I am interested in making my own zone plates, zone sieves, and photon sieves at varying focal lengths and ring counts. I am using the zone plate generator found on Mr. Pinhole.

I am having trouble finding a 35mm film that has a clear PET film base that I can use to photograph the zone plate target And develop to get a dmax of log 3.0 while keeping dmin equal to film base.

Anyone out there try this before with success and have some good film recommendations?

 

[Nicholas Lindan]

Lithographic film: https://www.ultrafineonline.com/ulhicoorlifi.html

 

[DPVisions]

Lithographic film: https://www.ultrafineonline.com/ulhicoorlifi.html

Thank you Nicholas!
I have tried Rollie Ortho and Ferrania Orto both of them have tinted film base I was not able to clear.

Will give Ultrafine a try when 35mm is back in stock.

 

[Nicholas Lindan]

I have tried Rollie Ortho and Ferrania Orto both of them have tinted film base I was not able to clear.

35mm lithographic films aren't really a thing, and it may be that all of them are coated on a a standard tinted anti-halation film base; and they may all be made by the same manufacturer, I can't imagine enough demand to support multiple makers.

I would try the sheet film variants. I can't vouch for the UltraFine, but lithographic film in general has a clear base and only comes as sheets.

If you are stuck using 35mm then you might try using one of the films made for reversal processing into projection slides. These do have a clear base.