Cooke 20-100 and Arri MB20

[Chris Burket]

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.

[Finner]

From my tests anything smaller then a 6x6 MB vinettes with a 20-100. The MB20 is a 4x5.6 I believe?

[Jeff Kilgroe]

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.

[Alexis Hanawalt]

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.

[Michael Thornton]

What's the rate? Cooke 20-100 t3.1

[Jeff Kilgroe]

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.

[Alexis Hanawalt]

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!

[Michael Thornton]

What's the rental rate? Cooke 20-100 t3.1

[Chris Burket]

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.

[Chris Burket]

I have used an MB14 with 4x5 stepdown trays on an 18-100 with no problems.