Will Cooke 18-100 zoom cover the sensor?

[Leo Ticheli]

Can the Cooke 18-100 zoom be used on the Red camera without vignetting?

The Red sensor is 24.4 x 13.7mm and the specs on the Cooke 18x100 say that the maximum format covered is 22.05 x 16.03mm.

I think the Cooke would make an excellent choice, but I don't want to deal with vignetting problems.

Sorry if this information has already been posted; I was unable to find it with a search.

Best regards to all,

Leo

[Stephen Williams]

Can the Cooke 18-100 zoom be used on the Red camera without vignetting?

The Red sensor is 24.4 x 13.7mm and the specs on the Cooke 18x100 say that the maximum format covered is 22.05 x 16.03mm.

I think the Cooke would make an excellent choice, but I don't want to deal with vignetting problems.

Sorry if this information has already been posted; I was unable to find it with a search.

Best regards to all,

Leo

Hi,

They actually cover S35 so I would not worry. The Zoom used by PJ does not cover either if you believe their makers!

Stephen

[Alex Wengert]

Stephen,
The Zoom used was a 24-290 Optimo. It covers a full aperture 35. The 17-80 Optimo doesn't.

[Stephen Williams]

Stephen,
The Zoom used was a 24-290 Optimo. It covers a full aperture 35. The 17-80 Optimo doesn't.

Hi,

Check out the Arg website!

Stephen

[steevo435]

What?!?! Are you sure the 17-80 doesn't cover? What about the 15-40? I'm renting a 15-40 to shoot S35 Super TV Saturday...it better cover!!
I don't see why they would make the 24-290 (which is beautiful) cover every format but not the others?
As far as the 18-100 Cooke, it covers but we noticed something weird with a rental a few years ago....on S35 1.85 it didn't vignette, but there was some portholing (loss of light around the corners) going on. I talked to Les Z (ZGC) and he said that's why they recommend that image size. Of course, we were shooting a white wall...you may not notice the portholing in a different situation.

[Stephen Williams]

Hi,

Only lenses designed in the last 10 years were designed with S35 in mind. Most popular zooms do cover. I think you will find the portholing will go if you stop down slightly, many primes have this problem too.

Stephen

[Chris Kenny]

Remember, when shooting 4K (rather than 4.5K), Red's sensor is basically the width of Academy format, not S35.

[steevo435]

Chris-
According to Red.com spec, 4K = 22.2 x 12.6
Arriflex S35 1.78 (16x9) = 22.5 x 12.65

Am I missing something?

[Chris Kenny]

As far as I know, S35 is 24.9 wide. Red's format chart (http://www.red.com/formatoptions.shtml) shows their 4.5K S35 as 24.4 wide.

[Leo Ticheli]

Thanks for the information!

The question remains; is a Cooke 18-100 which covers 22.05mm, acceptable for shooting 4K with 22.2mm?

Has anyone at Red thrown up a Cooke 18-100, a very common lens that is still in production at Cooke, to give it a try?

And... for you lens savvy guys, can the coverage be increased?

Good shooting and best regards to all,

Leo

[steevo435]

Sorry Leo!:turned:
Got sidetracked there. I don't think it would be worthwhile to try to increase the coverage. Coverage=magnification. Magnification=longer focal lengths. The 18mm wide might be (guessing) 21mm. Magnification also increases the likelyhood you will see flaws in the lens that were not noticeable before. If you've ever thrown a 1.4 or 2x extender on a lens (say Ang HR25-250) to get extra reach, you will generally see the image quality degrade significantly, even through the eyepiece.
On another note:
24.9 is full aperture. There is usually some protection around the frame, just as there is a difference in full vs. active pixels on the Red sensor.
Red format chart says 4K = 22.2 x 12.6
Arriflex S35 1.78 (16x9) = 22.5 x 12.65
Panavision S35 1.78 = 24 x 13.5
I don't know why on the format chart that reg.35 is compared to 4k, the largest width N35 frame I can find is 21mm.
It definitely seems like thier format sizes are closer to Arri than Panny. On Arri's website, they have all thier ground glass formats and they are very close (.1mm) in size to the Red sensor specs, ie S16 1.78 is 11.2 x 6.3, Red's window is 11.1 x 6.3

[Leo Ticheli]

Thank you for the help!

I received an email from Red saying that the Cooke 18-100 should be fine, so that will be my default lens. I've also ordered the Red 18-50 for use when the weight of the Cooke will be a liability.

Now I'll have to come up with a good 25-250 for longer stuff and a full set of primes, starting with a 14mm and a 10mm.

By the way, for the way I like to shoot, the very wide angle lenses are vitally important; I wish Red was offering a 10 & 14. The prices on those puppies are stratospheric, even in the used market.

Good shooting and best regards to all,

Leo

[Stephen Williams]

Thank you for the help!

I received an email from Red saying that the Cooke 18-100 should be fine, so that will be my default lens.

Leo

Hi Leo,

If you don't yet own the Cooke I would wait untill you can test it on a Red camera. In theory is should work very well, but until you test you won't know for sure.

I am waiting to test my 20-60 & 20-100 Cookes on a Red before making any buying decisions.

Stephen

[Volker Ehlers]

Hi steevo,

ARRI S35 1:178 exposed negative area : 24mm x 13,5mm

Usefull reference: ARRI Groundglass guide. Download on their webpage.
Cheers

[Stephen Williams]

Hi steevo,

ARRI S35 1:178 exposed negative area : 24mm x 13,5mm

Usefull reference: ARRI Groundglass guide. Download on their webpage.
Cheers

Hi,

The Diaganol is approx 0.1mm more than Acanemy full frame, hardly a big suprise when I say it covers!

Stephen

[Stephen Webb]

Stephen,

What area does your 20-100 cover?

[Stephen Williams]

Stephen,

What area does your 20-100 cover?

Hi Stephen,

Just about a S35 Full frame, just visible extreme corners in some focus possitions. On a 3 perf S35 camera everything all the time. The front Matte has to be removed however.

Stephen