Undering standing mm = field of view?

[Matthew Rogers]

So, like me, I am sure that many of you are diving into the "cine" world (as far as gear goes) for the first time thanks to the red. Now as I shop for lenses I am confused about what field of view 18-50 really shows me. I looked at my JVC 110u's stock lens tonight and it says that it is 5.5 to 85mm. Well, I know that it's NOT 5.5mm in 35mm terms (considering they make a wider lens for the JVC ProHD line) but I haven't been able to find info on the net that tells me how to convert it to 35mm terms that I can understand.

If someone could find understandable info on how to convert mm's between different size lenses, I think it would make a great sticky.

Thanks,

Matthew

[Poi Boy]

I think it is a .4 or .5 factor so the 18-50 will be about 27 / 75 in 35mm equivalence.
Aloha
-A

[Evin Grant]

My conversion (by the diagonal FOV) from 35mm FF still format to Red 4K is 1.7x
I.E. a 50mm lens on the Red is the same as a 85mm lens on a 35mm still film camera.

Check out this link...
http://www.reduser.net/forum/showthread.php?t=2732
and this one...
http://www.reduser.net/forum/showthread.php?t=1487

[Poi Boy]

Thanks Evin; so as you can see you will definately need something wider to go with your red zooms.
Aloha
-A

[David Mullen ASC]

Since the conversion between 2/3" and 35mm cine is 2.5X, then a 1/3" CCD camera, which is half of 2/3", should be a 5X conversion -- so the equivalent of your 5.5-85mm JVC zoom in 35mm cine terms should be a 27.5-425mm if you want to get a 35mm zoom that matches field of view (in 4K mode on the RED camera). At least in theory.

5.5-85mm -- that's a long zoom...

[Poi Boy]

wouldn't it be nice to get a red zoom tha was the equiv of 27 to 425 !
-A

[David Mullen ASC]

I don't know -- I've always been wary of anything bigger than 10:1 zooms, due to the amount of glass that must be in those 15:1 or 20:1 zooms. In 35mm cine work, I tend to stick to the 5:1 zooms. Partially also because of the size, but I also notice that 5:1 zooms tend to have less breathing problems than 10:1 zooms. For example, the 4:1 Panavision Primo zoom barely breathes but the 11:1 Primo zoom breathes quite a bit.

In B4-mount HD, though, I tend to use the 10:1 zooms a lot.

[Poi Boy]

yes, I understand the pifalls, I was just exclaming in a wishfull thinking sort of way.
Aloha
-A

[Matthew Rogers]

Since the conversion between 2/3" and 35mm cine is 2.5X, then a 1/3" CCD camera, which is half of 2/3", should be a 5X conversion -- so the equivalent of your 5.5-85mm JVC zoom in 35mm cine terms should be a 27.5-425mm if you want to get a 35mm zoom that matches field of view (in 4K mode on the RED camera). At least in theory.

5.5-85mm -- that's a long zoom...

Wow, I didn't realize that that the long end of the 5.5-85 was going to end up being quite that big mm wise. I guess my biggest concern is when I need the extra zoom power while capturing b-roll (oh, excuse me, second unit footage;)) for docs or corporate . Of course, most of the time that I live in the 50mm+ range is for interviews, trying to get the shallow depth of field--which should be about the same in 50-70mm on a 35MM lens.

Thanks,

Matthew

[PaulClements]

David have you ever used the Cooke 28-290mm (10:1) T2.8 (Hannibal). I've only seen it listed for rental at Joe Dunton company. Type "cooke 28-290mm" into Google and it only shows one listing which basically is a thread talking about Red.