RPP on SR2

[Aaron Neal Trout]

I'll be shooting a film on super 16 in the coming weeks using my school's SR2. I have access to a friends set of RPPs and was curious how their use on Super 16 would differ from them being used on ff35? What type of crop factor would I be looking at? Thanks!

[Mitch Gross]

Well first off, they don't even work for FF35, so get that one out of your head. I'm going to guess that your school has some S-16 lenses available for the camera. If you stick a 25mm lens from your school on the camera you will see the same image coverage as you would from the 25mm RPP. Crop factor from S-35 to S-16 is about 1/2, meaning the image is half the width and half the height.

But far more important is that I doubt you'll be able to physically mount the lenses. The RPPs are very fat lenses, and the SR2 have notoriously low viewfinders. Just because the camera has a PL mount does not mean it can take all PL mount lenses. I have not tried but there is a serious possibility that the viewfinder will not clear the lenses so that they will not be able to be mounted to the camera.

[Steve Sherrick]

Good points Mitch.

http://i296.photobucket.com/albums/mm179/smsjr/SRII-CON-UN-MAG-DX.jpg
Image from http://www.avprod.it/SR2_2.htm

[Joe Walker]

That's an Arri Bayonet Mount in the picture, wow, those were the days!

[Steve Sherrick]

That's an Arri Bayonet Mount in the picture, wow, those were the days!

:smile:

As Mitch points out, the viewfinder could come into play with the RPPs. Big lenses.

[Robert Craig]

who needs a viewfinder when you have awesome glass :biggrin:

[Robert Guthrie]

If you stick a 25mm lens from your school on the camera you will see the same image coverage as you would from the 25mm RPP. Crop factor from S-35 to S-16 is about 1/2, meaning the image is half the width and half the height.

Do you mean 50mm RPP?

[Charles Angus]

Do you mean 50mm RPP?

No, he doesn't, although he does mean "both on a S16 cam".

25mm is 25mm, regardless of what frame size it is designed to cover.

[Cail Young]

No, he doesn't, although he does mean "both on a S16 cam".

25mm is 25mm, regardless of what frame size it is designed to cover.

One of these days I have to do a big diagram about this and the related DOF discussion. So many people don't quite get it...

[Brook Willard]

One of these days I have to do a big diagram about this and the related DOF discussion. So many people don't quite get it...

I did one about two years ago for the FAQ... for both depth of field and field of view. I think the picture got eaten in the great forum burp. I'll see if I can find it.

[Aaron Neal Trout]

I'm going to guess that your school has some S-16 lenses available for the camera. If you stick a 25mm lens from your school on the camera you will see the same image coverage as you would from the 25mm RPP.

So if I take the Optar-Illumina Super16 25mm Prime out of the school's kit and mount it on any 35mm camera motion picture camera it's going to give me the same field of view as a 25mm RPP? (My apologies for confusing S35 and FF35, I didn't proofread my post)


Just because the camera has a PL mount does not mean it can take all PL mount lenses. I have not tried...

This is exactly why I ask, to leverage someone else's trial & error, but it appears no one else has so I'll be the first. I agree it most likely won't fit, especially since there's a video tap making the viewfinder stick out even further, but I've got to try.

[Steve Smith]

you don't want to try this. Some 16mm lenses will hit the mirror on a 35mm camera and can do damage. 16 lenses probably won't cover the 35 frame, but yes a 25mm lens will see the same as a 25mm lens.

Putting on 35mm lens on a 16mm camera is ok though. Very much like going from 4k to 2k on the red :-D

Steve
LA

[Paul Leeming]

So if I take the Optar-Illumina Super16 25mm Prime out of the school's kit and mount it on any 35mm camera motion picture camera it's going to give me the same field of view as a 25mm RPP? (My apologies for confusing S35 and FF35, I didn't proofread my post)
Aaron, first of all don't put a Super16 lens on a 35mm FILM camera as the rear element may strike the shutter. On Red though it's quite possible to do as there's no shutter to get in the way.

That said, a 25mm lens is always a 25mm lens, but the FIELD OF VIEW will change depending on the sensor format size. Here's an image rescued from an old thread that shows how this works:

http://www.visceralpsyche.com/misc/web_images/FoV.jpg

As you can see, the FIELD OF VIEW changes, but the real DEPTH OF FIELD won't as it is fixed for the lens and aperture you are shooting at.

HTH

Paul

[nigelsmith]

Great illustration!
Thanks Paul, that will come in handy when explaining these issues to students.

[Peter Hodgins]

who needs a viewfinder when you have awesome glass :biggrin:Exactly, I don't need no stinkin' viewfinder!