Kodak Portrait 405mm filter ring size?

[angusparker]

Does anyone know what size filters these lenses take?

[Louis Pacilla]

Nothing standard or a standard that I'm aware of as the front opening ID is almost 5" across and the rear cell is 4 1/2" so most likely will need gel filters . It's much easier using filters on the 305 K Portrait which takes Series IX filters.

[Tracy Storer]

I'll get out the thread pitch gauges and calipers tomorrow......but, BIG. I might tape 4" gels on the inside of the lens in a pinch.
What filters do you want to use ?

[angusparker]

I'll get out the thread pitch gauges and calipers tomorrow......but, BIG. I might tape 4" gels on the inside of the lens in a pinch.
What filters do you want to use ?

Thanks for that. If there are threads on the back side that would be good to know as well. Standard black and white filters - orange mostly - is what I would likely use most. B+W has filters up to 122mm which is 4.8 inches so it's possible that a screw in might work. Probably on the back side.

[Tracy Storer]

OK, my 405 does not have a filter thread on the back. The front filter thread seems to be 4 13/16-36tpi.
The rear glass is about 3.75" diameter, so a 4" gel filter holder on the back is probably the best bet.

I suspect the BW filters will have a metric thread. A 122mm x 0.75mm thread MIGHT fit !

36 tpi equates to a metric pitch of 0.706mm.....don't know what thread the BW 122mm uses.

EDIT, I searched and found that the B+W 122mm filter is a 1mm pitch, so it WILL NOT fit.

[Louis Pacilla]

Does anyone know what size filters these lenses take?

I'll get out the thread pitch gauges and calipers tomorrow......but, BIG. I might tape 4" gels on the inside of the lens in a pinch.
What filters do you want to use ?

Thanks for that. If there are threads on the back side that would be good to know as well. Standard black and white filters - orange mostly - is what I would likely use most. B+W has filters up to 122mm which is 4.8 inches so it's possible that a screw in might work. Probably on the back side.

OK, my 405 does not have a filter thread on the back. The front filter thread seems to be 4 13/16-36tpi.
The rear glass is about 3.75" diameter, so a 4" gel filter holder on the back is probably the best bet.

I suspect the BW filters will have a metric thread. A 122mm x 0.75mm thread MIGHT fit !

36 tpi equates to a metric pitch of 0.706mm.....don't know what thread the BW 122mm uses.

Nothing standard or a standard that I'm aware of as the front opening ID is almost 5" across and the rear cell is 4 1/2" so most likely will need gel filters . It's much easier using filters on the 305 K Portrait which takes Series IX filters.

[Tracy Storer]

I'm interested in the fact that they bothered to put threads there. Kodak may well have offered filters, or adapter rings to fit.

Where there's a thread, there's a way, even if it's one-off custom machining, most of us will reach for a roll of tape and a gel, before paying for a custom ring. (or investing the time.....I've got a lathe and could make one.)

EDIT: The B+W 122mm filters use a thread pitch of 1mm, so they will not fit the Kodak 405 lens. (a 122mm 0.75mm pitch would PROBABLY fit.)

[charleymeyer]

I have a 1951 Kodak 405mm lens that came with a #10 8X10 Century Studio Camera that was used for many years at a San Jose CA portrait studio. there also was a Cooke portrait lens which was more contemporary to the Century. The 405mm Kodak came with a 122mm Nikon L37C filter screwed into the front, presumably to keep dust out. It screws in only one fill turn. Is there such a filter size as Series X?

[Tracy Storer]

Charley, can you measure the filter thread pitch ? Just out of curiosity?

PS, my lens is from 1953

[angusparker]

Thank you everyone. You have been amazing. Got a much better idea of what I need to do. Best Angus