Welcome to our community

Be a part of something great, join today!

Log in
  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Filters for RED 300mm?

J

Jorge Díaz-Amador

Well-known member
Joined
Apr 26, 2007
Messages
346
Reaction score
0
Points
0
Location
Portland, ME
Website
www.cinematechnic.com
Just wondering if the RED 300mm takes 40.5mm screw-in filters in the back like most other 300mm cine lenses. There is no mention of this (or any other specification) on the RED website, so I thought an owner might know.
 
OK... I have *never* heard of 43mm filters. 40.5 mm and 48 mm are the two standard sizes in small screw-in filters.

Paul: Thanks for your answer. Could you measure with a caliper across the diameter of the threaded part (major diameter of the thread) of the filter? I would greatly appreciate it. 40.5 mm filters have a thread with a major diameter of 40.4 mm (-0.1 mm tolerance for thread fit).

I've got some 40.5 mm filters for sale, and I'd like to say that they will work with the RED 300 mm (as they do with every other 300 mm cine prime lens). But I have to be sure before I can state that.
 
Rear filter is definitely 43mm, too big for 40.5 and too small for 48mm. Your 40.5mm filters will not fit. Neither will ours, which is how I found out that RED used a non-standard size.
 
The filter is a 43mm screw-in filter. It is a common size, the problem I have found is the filter must be thin...So far I have tried two sets of Pola filters and they were both too thick to fit in the tray.

This is the last one I tried:
B+W 43mm NEUTRAL DENSITY #103 ND0.9 FILTER - BW10343

If anyone has successfully fit a pola, please list the brand/part #.
 
43mm is the magic number.
Also don't leave that tray empty. If you aren't using a filter in it's place put the clear back in.
 
My Tamron 300mm prime uses a 43mm in a rear filter tray. Not sure how similiar the RED 300mm is to that, but I have Tiffen filters in it - if that is of any help. 43POL
 
Anyone else notice how curious it is that the RED 300mm doesn't actually have the focal length marked on it anywhere? I don't believe there's a serial number either. Didn't notice until a tech in our office picked it up and asked what it was, and then I realized there was absolutely no way he could know from looking at it.
 
Does anyone know if the drop-in filter can affect the focusing? If I drop in a filter of different thickness or refractive index, would it set witness marks off?

BTW, I used 117mm Arri adapter ring with clip-on LMB-5 on Red 300mm. It is a tight fit, but it works.
 
Yes, Pawel.
It's very common that a lens that accepts a rear filter be calibrated and marked either with or without the glass filter installed.
My Zeiss 300mm always wears a clear filter because that's the way the lens techs set it up. I would assume it's the same for the Red lens.
Cheers,
Harry
 
Just to clarify here. A filter that is dropped into the lens at the rear will always affect your focus marks. You're essentially extending the light path by the thickness of the filter. Your collimation should reflect this. If your lens is collimated with a filter, that filter should stay put, or in most cases, a clear filter should occupy its place. Filters that are used at the front of the lens will not affect back focus, as the light traveling into the lens is un-modified, relative to the optical design, and does not require adjustment.
 
Matthew Duclos said:
Just to clarify here. A filter that is dropped into the lens at the rear will always affect your focus marks. You're essentially extending the light path by the thickness of the filter. Your collimation should reflect this. If your lens is collimated with a filter, that filter should stay put, or in most cases, a clear filter should occupy its place. Filters that are used at the front of the lens will not affect back focus, as the light traveling into the lens is un-modified, relative to the optical design, and does not require adjustment.
Click to expand...

This is true. More so if the filter is located after the final lens element. The flange focale depth will optically be increased about one third the thickness of the filter.
 
B and W filters will fit but not if screwed in fully as then the tread emerges on the other side of the holder and will not slot in. If you dont screw in fully though they can screw themselves in a bit due to vibration and thus can be tricky to extract. I need to look at it more closely and most likely enlarge the hole where the filters slot in or grind the filter housings down a bit to fit. 43mm is the size - possible to find but not the most common

james
 
I received my RED 300 last August along with my first RED camera, #0008. Clear back then I bought Hoya 43mm multi-coated filters for the drop in tray. I bought them online from B&H. They fit with no problem whatsoever, and optically there have been no problems.

I've used the RED 300 extensively for sports and nature production with excellent results. It also performed and tested out quite well at our LART testing last December. It is a crisp lens, solid and well made.
 
You must log in or register to reply here.
Back
Top