RPP 300mm Thread Size? (barrel)

[Stivan Widick]

Does anyone know what size the threading on the barrel of the RPP 300mm is?

Thanks.

[Lewis-M Soucy]

The outside is 117mm.

The 300mm has a filter slot near the PL mount and requires 43mm filters. The lens actually comes with a neutral clear filter.

I got a nice set of 43mm ND's from B&H and they fit perfectly.

I couldn't find the right picture, but this one will give you an idea of the system:

[Jeff Kilgroe]

The front threads on the 300mm are a non-standard size and a byproduct of manufacturing. You really, really, don't want to use them. On long focal lengths like this, you need to use the drop-in tray!

43mm is the size as Lewis points out, they do need to be low-profile filters as the clearance is rather tight. My set of ND's for the RED Pro 300 are Hoya and work well.

[Nate Clapp]

FYI RED primes are 110mm front not 114.

[Brian F Kobylarz]

Except for the 300mm which is 117.4mm

[Ron Reddick]

and to protect the front, Optical clear dropped into your matte box filter folder. I use that on outdoor shoots when not using ND's.

Ron

[Mark Pedersen]

The front threads on the 300mm are a non-standard size and a byproduct of manufacturing. You really, really, don't want to use them. On long focal lengths like this, you need to use the drop-in tray!

43mm is the size as Lewis points out, they do need to be low-profile filters as the clearance is rather tight. My set of ND's for the RED Pro 300 are Hoya and work well.

Hey Jeff,

Just bought a Leica APO-Telyt-R 280 f2.8 which has a Leica 112mm filter to protect the front element. It also has a series 5.5 drop in filter ring like the Red Pro, Nikon, Canon etc., but it seems the 5.5 filter size is a bit of an orphan in the drop in filter world. Know of any good sources?

Also, is there any issue using standard filters in a MB in front of the lens at this focal? Do it all the time with an Angie 24-290... I've heard that before, but don't really get why.

M

[Lewis-M Soucy]

Also, is there any issue using standard filters in a MB in front of the lens at this focal? Do it all the time with an Angie 24-290... I've heard that before, but don't really get why.

Absolutely no issues. I do it all the time.

[Brian F Kobylarz]

Mark,

The Series 5.5 can be a bit hard to find, but there are a few out there.
B&H can special order those made by B+W.
Schneider cuts all of their filters at their facility on Long Island - They may have an inventory of rings for 5.5 that they can cut some stock glass to fit.
Bob Zupka used to cut all of my special orders at Schneider - was a master at his craft - extremely knowledgeable and always willing to share - his recent passing is such a terrible loss.

If I am not mistaken, the Leica APO also has an additional internal thread for screw-in type filters (Size is E77) - might improve the search results.

Another resource you may want to add to your files is S.K. Grimes in Woonsocket, RI. - They specialize in custom ($$$) manufacturing for cameras - unsure if they cut glass, but they can certainly make new rings.
http://www.skgrimes.com/

Hey Jeff,

Just bought a Leica APO-Telyt-R 280 f2.8 which has a Leica 112mm filter to protect the front element. It also has a series 5.5 drop in filter ring like the Red Pro, Nikon, Canon etc., but it seems the 5.5 filter size is a bit of an orphan in the drop in filter world. Know of any good sources?

Also, is there any issue using standard filters in a MB in front of the lens at this focal? Do it all the time with an Angie 24-290... I've heard that before, but don't really get why.

M

As far as filters in front, Lewis is right - no issues at all for standard filters. If you use any grads, use a HE to retain the effect.

[Jeff Kilgroe]

Looks like Brian has suggestions for the 5.5's covered. Better than I would've done without looking into it.

Filters on the front are not a big deal for IR cut, ND, polarizer, etc... Some effects filters like grads, glimmer glass, etc.. can produce differing results with longer focal lengths. Many longer lens designs can suffer from focus shifting or dilation as you stack more glass in front of the lens. The Optimo 12X and RED 300 are no exception. A single filter, even using an ND and pola is usually fine. You will get better results on the RED 300 by keeping your ND inside the drop-in tray. If you don't have a filter in the tray, keep the clear glass included one in there as the lens is collimated to account for that layer in the optical path. Running it free of a filter there, can cause a minor difference, most people will probably not notice, but the difference is there.

As always, test, test and test again!