View Full Version : Cooke 20-100 and Arri MB20
01-24-2008, 10:41 PM
No RED yet, but I have an Arri MB20 and a Cooke 20-100 t3.1 that are available for rental. Located in Los Angeles.
01-24-2008, 10:45 PM
From my tests anything smaller then a 6x6 MB vinettes with a 20-100. The MB20 is a 4x5.6 I believe?
01-24-2008, 10:57 PM
The MB-20 [II] should accept 5.65x5.65. But yes, anything less than a 6" filter will get in the way on the Cooke 20-100 or 18-100 lenses. The front element is 153mm (or was it 156mm?). Either way 153mm = roughly 6".
I don't know about the older 20-100, but I think it's the same as the 18-100 and it takes drop-in filters. Drop in NDs and a 6" flat front are all you need with this lens. Oh and the sun shade.
Edit> I just checked, the front is 150mm on the 18-100. If you're serious about putting a mattebox in front of one of these zooms, I'd look at the MB-14.
01-24-2008, 11:51 PM
What's the rate? Cooke 20-100 t3.1
01-25-2008, 12:32 AM
The MB-20 [II] should accept 5.65x5.65. But yes, anything less than a 6" filter will get in the way on the Cooke 20-100 or 18-100 lenses.
This doesn't make sense. The 5.65's were made for this sort of application and the clip-on for the Vocas with its 5.65 is apparently designed specifically to accommodate the 20-100.
Finner, what exactly did your tests entail?
Jeff, the 20-100 has a 144mm front. 144mm = 5.66929134 inches. I think there's enough clearance there.
01-25-2008, 12:41 AM
it clearly states NOT to post in this section of the forums until you have a RED in your possession.
01-25-2008, 08:53 AM
Thread has been moved to the appropriate forum...
Cinewalt, Good to know about the front on the 20-100, so it is smaller than the 18-100. At 144mm, I could see where 5.65 might still vignette when full wide or depending on the mattebox itself.
01-25-2008, 10:26 AM
I'll ask my lens guy if he knows how much of the lens front is within effective shooting range. I mean, it doesn't make sense for the 4 corners of the image to actually touch that 144mm perimeter - my guess would be 10 - 20% of the diameter of the lens goes unused.
I have a 20-100 and have been looking into 5.65 matteboxes, so this is suddenly a concern for me!
01-25-2008, 12:07 PM
What's the rental rate? Cooke 20-100 t3.1
01-25-2008, 06:40 PM
The Cooke 20-100 rents for $120/day or $320/week. The Arri matte box rents for $50/day or $150/week. I'll throw the lense/matte box on a couple 35mm cameras and let you know if they vignette. It'll be next week before I can get to that though.
01-25-2008, 07:56 PM
I have used an MB14 with 4x5 stepdown trays on an 18-100 with no problems.
01-20-2009, 06:41 PM
Updating a thread here that's almost a year old.
I'm about to buy a Cooke 20 - 100, and the microMattebox to go with it. I was wondering if anyone has had any issues (specifically vignetting due to size of mattebox) with this combination.