My Plead to the RED Team for Alternative Lens Mounts

I read it in another thread that somebody had suggested a Universal RED Mount, a quick release type of interchangeable/intermediate mount so that we can use different brands of lenses, when we absolutely have to, on the same set in the same day QUICKLY.

I think that is an excellent idea and hope the RED team will take a serious look into it.
 
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HKSC said:
a Universal RED Mount, a quick release type of interchangeable/intermediate mount
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Then you would just need a small adapter that sits on each lens right?
 
agwah said:
Then you would just need a small adapter that sits on each lens right?
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Hi,

The lens has to be designed that way so you take off one mount and can fix another. On the Cooke Zoom the intermediate adapter is at least 1 inch from the back element giving lots of space to play with.

Arri PL lenses were not designed this way.

Stephen
 
HKSC said:
somebody had suggested a Universal RED Mount, a quick release type of interchangeable/intermediate mount so that we can use different brands of lenses
Click to expand...

Hi,

Remember if it's too 'quick release' your lens could fall on the floor!

Stephen
 
agwah said:
Then you would just need a small adapter that sits on each lens right?
Click to expand...
http://www.dvxuser.com/V6/showpost.p...9&postcount=49

I think that's the idea. A brand-specific adapter attached to the lens on a semi-permanent basis converts a lens to a Universal RED Mount (or a BNC or what not that has the largest diameter and shortest flange focal distance). The Universal mount will then be attached to any RED camera in an instant.

By the way, on a typical shoot, we change lenses more than 15 times a day, if we shoot with primes, without carefully cleaning or recalibrating the lens mount each time. We don't usually have major problems. Why are we so nervous about the lens mount seating being absolutely perfect now? Can someone compare the on set environment and machine shop requirement?
 
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Stephen Williams said:
Hi,

Remember if it's too 'quick release' your lens could fall on the floor!

Stephen
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I think the PL, BNC, Nikon or other positive locking mounts are all based on a "quick release" concept as opposed to having to bolt down or screw in an attachment.
 
HKSC said:
http://www.dvxuser.com/V6/showpost.p...9&postcount=49
By the way, on a typical shoot, we change lenses more than 15 times a day, if we shoot with primes, without carefully cleaning or recalibrating the lens mount each time. We don't usually have major problems. Why are we so nervous about the lens mount seating being absolutely perfect now? Can someone compare the on set environment and machine shop requirement?
Click to expand...

Hi,

When you change PL lenses on set you should check the lens is free from dirt, if not the lens will not seat correctly and the mount may become slightly scuffed causing future problems.

I recently rented some Cooke S4's from a rental house, on check out I noticed one lens did not focus at infinity. The tech said the lens was OK and he had checked it. Turns out a slight metal burr on the lens mount that needed to be removed with a grinding stone.

I read yesterday here that back focus issues can be a problem on film. In 25 years of shooting film I have never had such a problem, but I do take great care when handling lenses.

4 surfaces to get dirty is going to be less reliable than just 2 IMHO.

Stephen
 
Alex ..
who did the conversion on your 10-100 ?
optex? zeiss? century ? cinemaTechnic ?
and did it end up a 11-110 T2.2 or 12-120 T2.4 after conversion

you mentioned 10-100T2 at $6500 - was that with or without conversion?
 
Stephen Williams said:
Hi,

When you change PL lenses on set you should check the lens is free from dirt, if not the lens will not seat correctly and the mount may become slightly scuffed causing future problems.

I recently rented some Cooke S4's from a rental house, on check out I noticed one lens did not focus at infinity. The tech said the lens was OK and he had checked it. Turns out a slight metal burr on the lens mount that needed to be removed with a grinding stone.

I read yesterday here that back focus issues can be a problem on film. In 25 years of shooting film I have never had such a problem, but I do take great care when handling lenses.

4 surfaces to get dirty is going to be less reliable than just 2 IMHO.

Stephen
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Thanks for the insight.

Back focus is actually a much bigger problem in my experience. About twenty years ago, I used a Kinoptic 9.8mm super wide lens with bad back focus that you couldn't tell in the view finder (not even with video assist today). The shots all got screwed up in the soup. Concerns for back focus accuracy with wide angle lenses are very legitimate.
 
HKSC said:
Thanks for the insight.

Back focus is actually a much bigger problem in my experience. About twenty years ago, I used a Kinoptic 9.8mm super wide lens with bad back focus that you couldn't tell in the view finder (not even with video assist today). The shots all got screwed up in the soup. Concerns for back focus accuracy with wide angle lenses are very legitimate.
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Hi,

What was the lens mount, Arri Standard?

Stephen
 
HKSC said:
I read it in another thread that somebody had suggested a Universal RED Mount, a quick release type of interchangeable/intermediate mount so that we can use different brands of lenses, when we absolutely have to, on the same set in the same day QUICKLY.

I think that is an excellent idea and hope the RED team will take a serious look into it.
Click to expand...
This would be a great idea!
 
So how wide/thick/solid must the RED INTERMEDIATE QUICK MOUNT be to be able to accomodate all the lenses that people want to use? If it can swallow any other quick mount, and is itself a quick mount it is all good right? The idea is the same as RED has originally prepared for, the only difference is really that it is not bolted on but large or in some other way solid and sturdy enough to make it a quick release.

Maybe it should have some connections to prepare for power and all kinds of flow of information back and forth to the lens as well, why not?
 
agwah said:
So how wide/thick/solid must the RED INTERMEDIATE QUICK MOUNT be to be able to accomodate all the lenses that people want to use? If it can swallow any other quick mount, and is itself a quick mount it is all good right? The idea is the same as RED has originally prepared for, the only difference is really that it is not bolted on but large or in some other way solid and sturdy enough to make it a quick release.

Maybe it should have some connections to prepare for power and all kinds of flow of information back and forth to the lens as well, why not?
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Hi,

It depends on the final size and shape of the camera.

If the lens mount is designed to screw to the camera BEHIND the image plane of the sensor then I think any mount could be made to work.

Stephen
 
Stephen Williams said:
Hi,

What was the lens mount, Arri Standard?

Stephen
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I believe it was Arri bayonet (the one you have to turn and lock...?), if my memory serves me correctly.
 
HKSC said:
I believe it was Arri bayonet (the one you have to turn and lock...?), if my memory serves me correctly.
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Hi,

The only advantage of older mounts was for macro work as the lens could be loose in the mount and moved forward! I think BNCR & PL mounts fixed most problems as long as the mount was clean.

Stephen
 
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