Film-Tech Forum ARCHIVE: unsolved lens automation issues on Barco seriesII

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Topic: unsolved lens automation issues on Barco seriesII - anyone?

Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12814
From: Annapolis, MD
Registered: Dec 1999

posted 06-28-2014 08:06 AM

Mark, on a Barco "B" series, with the exception of the 4K specific InVision lenses (just three sizes), the projector lens mount handles focus...which has been the source of the "B" series image shakes.

Brad, there are SOME lens sizes where Minolta and Fujinon lenses are available in the same size...case in point...the 1.4-2.05 and I think the next size larger. I have a complex that has one of each. The problem is that one doesn't have a choice to use just Minolta and I agree (and have stated in other threads).

If you ask the typical installation tech and put 10 lenses of the same size from each manufacturer to install (thirty lenses total)...10 from minolta, 10 from Fuji, 10 from InVision...all the same size. In those piles represents their good/bad quality level. You had to bet your reputation on the end results and you can only select ONE lens for this one critical installation...you can't go back if there is a problem...which pile of lenses would you grab from?

I don't know any tech that wouldn't go to the Minolta pile. While they have a bad one every once in a while...but your odds are so much better with them. I've had excellent from all three too but you can almost bank on the Minolta. I wish Minolta would make some 4K specific lenses too.

I'm wondering if the new Barco "B" lens mount does a better job holding focus. I think you'll find that the focus drift on the Barco "B" is dependent on down angle and how the mount flexes due to its need to move for focus. It has to see-saw a bit and dance that fine line of movability and precision.

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