Birger Collimation? [Archive]

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Mark B.

10-25-2008, 03:34 AM

What are the steps necessary to properly collimate a Birger mount?

Martin Weiss

10-25-2008, 03:56 AM

Patience, while waiting for your mount ;)

Sorry, I'd tell you more if I had mine :)

Brian Timmons

10-25-2008, 04:22 AM

Jason Ing

10-25-2008, 06:33 AM

Step 1: Receive Birger mount.
Step 2: Stare at it in awe and disbelief.
Step 3: Cry.
Step 4: Collimate.

Jorge Díaz-Amador

10-25-2008, 07:56 AM

To do this you need a properly calibrated test lens, and a sensitive collimator, with a focal length at least 5x the test lens and preferably close to 10x.

I keep being told it's a do-it-yourself job, and I'm not inclined to believe that. It took me months of using a collimator every day to get used to it and get consistent results.

I don't know how someone with no experience and with no collimator is going to accurately calibrate the FFD of a lens mount. I think a lot of people are going to get very frustrated.

I've been in the movie camera business 15 years, and changing and calibrating lens mounts has never been considered to be a DIY job.

I'm putting on my asbestos undies now...

Mark B.

10-25-2008, 02:09 PM

http://www.reduser.net/forum/showpost.php?p=187514&postcount=888

http://www.reduser.net/forum/showpost.php?p=187562&postcount=896

http://www.reduser.net/forum/showpost.php?p=192426&postcount=973

http://www.reduser.net/forum/showpost.php?p=194770&postcount=1033

http://www.reduser.net/forum/showpost.php?p=293308&postcount=3550

I'm charging for this next time. :greedy:

Hope this helps.

Brian

The mechanical Birger side of things seems pretty straight forward. It's the other stuff I'm wondering about. Like, which resolution chart (preferably free off the Internet) is the best to use to do the collimation test? And Birger's been mentioning software to aid in the collimation, but I haven't actually seen any link for that software mentioned. Is that software not ready yet or did I just miss the post that talks about where to go to download it?

LEON

10-25-2008, 03:53 PM

I keep being told it's a do-it-yourself job, and I'm not inclined to believe that. It took me months of using a collimator every day to get used to it and get consistent results.
I've been in the movie camera business 15 years, and changing and calibrating lens mounts has never been considered to be a DIY job.

The thing is, with RED, we can SEE at once the result of collimation on a huge screen without waiting for the lab, it's not a film camera...SMILE
After 15 years maybe there are new lights to illuminate you !

Stephen Williams

10-25-2008, 05:09 PM

The thing is, with RED, we can SEE at once the result of collimation on a huge screen without waiting for the lab, it's not a film camera...SMILE
After 15 years maybe there are new lights to illuminate you !

Hi,

AFAIK Red only outputs a 720p image, as long as you dont want to view your images above 720p you will be fine, other people however will want to.

Stephen

LEON

10-25-2008, 05:36 PM

Hi,

AFAIK Red only outputs a 720p image, as long as you dont want to view your images above 720p you will be fine, other people however will want to.

Stephen

playback a take doesnt that long !

Benjamin Rowland

10-25-2008, 07:51 PM

... And Birger's been mentioning software to aid in the collimation, but I haven't actually seen any link for that software mentioned. Is that software not ready yet or did I just miss the post that talks about where to go to download it?

I've been wondering about that software myself. How does it help? How does it work?

Joel Kaye

10-25-2008, 10:48 PM

Hi,

AFAIK Red only outputs a 720p image, as long as you dont want to view your images above 720p you will be fine, other people however will want to.

Stephen

RED is capable of 1080P playback.