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  • 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 :)

Doubts on swapping mounts... [related to Birger's mount]

Spinflight said:
With all this talk about collimating a lens, has anyone thought about the sensor? What if the sensor itself is 5 microns off in one direction? I would think this would be a problem that adjusting a lens couldn't even begin to fix.
Click to expand...

Morning Spinflight,

Why do you think that?

Chuck
 
Every manufacturer has a window of tolerance for any part that's manufactured. Who's to say a sensor that is 5 microns off won't pass inspection.

We know how to correct a lens. But are we correcting the lens or actually misaligning it to hit a sensor that is slightly off.

My question is, is there a way to adjust the sensor plane so that it is exactly parrallel to the front of the camera. This has to be accurate first before we even start messing with the lens. Otherwise, you'll be doing it all backwards.

I wouldn't want to alter my set of perfectly good Red prime lenses work on my senser that may be the culprit.
 
Spinflight said:
Every manufacturer has a window of tolerance for any part that's manufactured. Who's to say a sensor that is 5 microns off won't pass inspection.

We know how to correct a lens. But are we correcting the lens or actually misaligning it to hit a sensor that is slightly off.

My question is, is there a way to adjust the sensor plane so that it is exactly parrallel to the front of the camera. This has to be accurate first before we even start messing with the lens. Otherwise, you'll be doing it all backwards.

I wouldn't want to alter my set of perfectly good Red prime lenses work on my senser that may be the culprit.
Click to expand...

Hi,

You collimate the mount to the sensor, in the same way people always have with film cameras so that the mount of a camera is parallel to the film.

Don't mess with the lenses, if you do they will only be correct on your camera.

Stephen
 
Lens seat to film plane parallelism is one of the easiest parameters to check on a camera. You don't even need a taking lens to perform the test. I'm sure the assemblers at RED know how to do this.
 
My bad, Thought I read on here someone was actually modifying a lens. I need some sleep. Disregard my post :-(
 
After reading the several collimation threads I talked with Ted down at Red HQ about collimation and he confirmed my worst thoughts: you will have to re-collimate the Red *every single time you change mounts*. So, if you never touch the mount and stick with the factory-collimated PL then you are fine. But if you go to the Birger EF you have to collimate. Then if you want to go back to the factory PL you have to re-collimate and so on. The idea of potentially needing to attempt to grind my mounts scares me (I would certainly screw that one up). So I'm now afraid to use anything but PL. One of the Red employees (I forget his name, he was the guy in the first screen capture that Red released using a Nikon lens) said he spent 2 days helping Soderbergh's crew collimate their Reds using all their lenses.

Ouch, I haven't the skills for that sort of thing.
 
So, on the flip side. Let's say you start with Nikon lenses.
Will RED call you up and say "Hey you ordered the Nikon mount,
do you want that installed".
So you would be good, shooting with any Nikon mounted lens?
Until you got the dough to buy the RED PL lenses?
 
Shawn Nelson said:
you will have to re-collimate the Red *every single time you change mounts*.
Click to expand...

Bummer....

Shawn Nelson said:
One of the Red employees said he spent 2 days helping Soderbergh's crew collimate their Reds using all their lenses.
Click to expand...

Well, I guess we'll know more soon...

But it's not looking to good for guy's like me that wanted to switch back and forth.
 
collimation is not that big of a deal if you measure and it's in spec.
If you measure and it's suddenly off, then you will spend time figuring out what went wrong. If the camera flange and the mounts are in spec, and you change them in a clean environment, I can't see why you'd have a problem.
 
Shawn Nelson said:
After reading the several collimation threads I talked with Ted down at Red HQ about collimation and he confirmed my worst thoughts: you will have to re-collimate the Red *every single time you change mounts*. So, if you never touch the mount and stick with the factory-collimated PL then you are fine. But if you go to the Birger EF you have to collimate. Then if you want to go back to the factory PL you have to re-collimate and so on. The idea of potentially needing to attempt to grind my mounts scares me (I would certainly screw that one up). So I'm now afraid to use anything but PL. One of the Red employees (I forget his name, he was the guy in the first screen capture that Red released using a Nikon lens) said he spent 2 days helping Soderbergh's crew collimate their Reds using all their lenses.

Ouch, I haven't the skills for that sort of thing.
Click to expand...
I seem to remember a recent post stating that the Birger mount might have changed to one which uses the original Red mount in place, more like a mount adapter. I'd be just as worried as you if I needed to collimate every time I changed mounts, though right now I'm on the fence with the Birger anyway since I've decided to get both zoom lenses from Red for each of my cameras, covering 99% of likely shooting conditions. HTH
 
This is all standard affair for any professional cine camera system. Don't be afraid of it, just get used to it. Or even better make VERY good friends with a local rental house and have them do it. Then give them a deal when they need to subrent a body from you. Hell Mine will probably live at one of my local rental houses.

_mike
 
you should think the world is the same.. according your own standards wherever you are.. ah, americans or english speakers.. strange people.. always self-centered on your own world..

the planet is a bigger place.. bigger than your own mind.. :-)
 
btw, this reminds me that feature.. the others.. actually, a non native english feature though in english language :) but, it reminds me that feature anyway.. :detective2:
 
Mike Prevette said:
This is all standard affair for any professional cine camera system. Don't be afraid of it, just get used to it. Or even better make VERY good friends with a local rental house and have them do it. Then give them a deal when they need to subrent a body from you. Hell Mine will probably live at one of my local rental houses.

_mike
Click to expand...

Since I want to rent out my Red, that immediately makes me a "competitor" to my local rental house. I already approached one of them to co-host a "Red Open House" with my Red and their accessories, they turned me down. I was sure bummed, it seems they didn't want to work together. I would prefer a strong working relationship.
 
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