305mm portrait lens

[chris_4622]

Hi,
Does anyone know the size of the filter thread for the Kodak 305mm portrait lens ? Is it in millimeters? My rough way of measuring came up with 3 3/8".

chris

[Ash]

Chris, I'd recommend stopping by your local tool shop and picking up a set of calipers. They're really cheap and you'll be able to check diameters/thread sizes for all your future lenses/needs

[andy bessette]

Chris, I'd recommend stopping by your local tool shop and picking up a set of calipers. They're really cheap and you'll be able to check diameters/thread sizes for all your future lenses/needs

Yo,

I second that. There is a plastic dial caliper with enough precision to be useful (General brand is one) available in most hardware stores. It's east to read, and won't scrath your lenses.

best, andy

[Jim Rice]

Very often older lenses (especially American made ones) do not have standard filter threads. Through , say, the 1950's series sized filters ruled and slip on adapters were required. Sadly these filters and adapters have largely fallen into dustbins of history. I know y'all get tired of me suggesting it, but here it goes again:

Get a filter step-up ring whose absolute minimum inside diameter is just a little larger than the outside diameter of the front of your lens barrel. Go to your local drug store or stationers and get an assortment of rubber bands. Find a rubber band that when stretched around the nose of your lens makes an appropriate gasket to provide an interference fit with the step-up ring. For my 16.5" apo-artar and a 67>72 ring the rubber band was about 3/8" diameter un-stretched and about 3/16" wide. Try to get the ring as parallel to the front of your lens as possible.

Voila, a standard filter thread on a classic lens. S.K. Grimes has a different system which also includes rubber bands, but runs about $50~60 more.

[chris_4622]

I have a filter holder that screws into the front of this lens. I was hoping to get some step down rings to use this holder and filters on my other lenses but I don't know what size the threads are and whether they're a U.S. standard or metric thread. I'll try the plastic caliper method.

[Ted Harris]

chris, you can also call Jim at Midwest. he will have the appropriate rings and he recently acquired one of these lenses so he can tell you.

[John Berry]

It's a series 9. I gots me one.