Need help with filter sizing.

[Xia_Ke]

I recently acquired a Tessar 300mm f/4.5 in a Prestor 5 shutter and I want to pick up some filters for it, but I'm having trouble figuring out what size filters to use. An 82mm is a hair too small and an 86mm is a hair too big. I'm not aware of any standard filter size inbetween the two, but the lens is fully threaded on the front and the original factory cap is a push on, so I have to assume that it was meant to allow for filter use. Is there some filter size between 82mm and 86mm I'm not aware of? Thanks in advance for any help.

[Jim Noel]

get a push on filter adapter of appropriate size and filters to fit.

[Eric Woodbury]

Or use 100mm gels (polyester).

[Xia_Ke]

Thank you for the quick replies

get a push on filter adapter of appropriate size and filters to fit.

I've never had to use one before. Any in particular you'd recommend? The outside diameter looks to be about 88mm or 89mm (hard to tell exactly using a ruler). Only one I'm seeing from a quick Google search is the Lee FK100 which is for a 100mm outside diameter. Not sure if it would close down 10mm+?

Or use 100mm gels (polyester).

Do you mean just holding the gel in front of the lens? Any issues with reflections off the back of the filter? I primarily want to be able to use filters because the fastest shutter speed with it is 1/30, so filters would add more aperture options in brighter conditions.

[Dan Fromm]

Who made the lens? What is its name?

[Xia_Ke]

Who made the lens? What is its name?

Oops, sorry for not including that to begin with. It is a Zeiss Tessar 300mm f/4.5.

It is the one listed here on page 8 and shown on page 10.

http://www.arnecroell.com/czj.pdf

[Bob Salomon]

Oops, sorry for not including that to begin with. It is a Zeiss Tessar 300mm f/4.5.

It is the one listed here on page 8 and shown on page 10.

http://www.arnecroell.com/czj.pdf

Send an email to Heliopan and ask them if they have any 84mm filters or adapters left. Ideally you would want an 84 to 86mm adapter. But you would need to know the thread pitch of your lens as well as the thread size.

[Greg]

I used a gel filter holder that had 2 bent wires on opposite sides under tension that mounted it onto the lens barrel. Used it in back of the lens inside the bellows. No filter threads to match.

[Bob Salomon]

I used a gel filter holder that had 2 bent wires on opposite sides under tension that mounted it onto the lens barrel. Used it in back of the lens inside the bellows. No filter threads to match.

Besides being the wrong place to put a filter or gel optically, how do you use polarizes or graduated ND filters that way?

[Greg]

Besides being the wrong place to put a filter or gel optically, how do you use polarizes or graduated ND filters that way?

Interesting post Bob... As I recall Sinar recommended placing filters behind the lens. They even included a filter holder on the back of their Sinar Copal shutter (which I frequently use). Obviously Polarizers and gradated ND filters have to be used in front of the lens.