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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Zeiss and Cooke Side By Side Grab

Probably a T2.2 ... My lenses are the Cookes... the Zeiss set is a friends, so that was from memory.
 
ok, so the manual setting was what I noticed.... thanks for the details!

I still can't get over how blue the standard speed looks! I take it the Cooke is quite warm making an over cast day look sunnier and the Standard Speed made it even bluer? That has to be the case, right? But wow... that is scary blue in DVCpro HD land, I wouldn't want to have to adjust so much off the bat, I guess not an issue at all in RAW land, but still, more work in post.

The Cooke looks noticeably sharper too, but the Zeiss looks very nice too of course and less than half the rental cost.

Still, the Cooke looks so gorgeous... man, why did I have to see this. :ph34r:
Maybe if I just pretend and turn around, will that work?
 
Hi,

How did you focus the Zeiss lens?

Stephen
 
Oh... thanks for the heads up XiaoSu

I am going to get some specific info on the lenses that may be available to me from Cinequipt and start a thread discussing those instead of highjacking so many threads, I am sure Kip and company would appreciate it :)
 
Would have been nice with an image with more contrast and perhaps some really hot highlights such as a bare lightbulb.
 
USlatin said:
Do you mean that perhaps the Zeiss' focus was set a bit deeper than the Cooke?
Click to expand...

Hi,

Was it set by eye or distance? Has the collimation of the lens been checked with the adapter? Remember the EVF is only 720p, was focused checked at 1:1?

Stephen
 
USlatin - yes cloudy overcast day.

Stephen, the lenses were both set to infinity... the idea was to check and see if the quick change adapter I purchased from Les Bosher still maintained proper culmination when adapted to the Arri Std mount. We were using a Panasonic HD monitor not the small LED attached to the RED. I was really happy with the adapter... culmination was maintained and it takes seconds to attach.

As I said - the whole idea was to check the lens mount adapter and as I had my Cookes and a friend (Ryan's) Zeiss lenses there at the same time I figured I throw up a couple of grabs just to show the color temp/color rendition differences in each lens.
 
Kip Kubin said:
USlatin - yes cloudy overcast day.

Stephen, the lenses were both set to infinity... the idea was to check and see if the quick change adapter I purchased from Les Bosher still maintained proper culmination when adapted to the Arri Std mount. .
Click to expand...

Hi,

I don't think your lenses are correctly collimated, you were not filming infinity so the lenses should be set in front of infinity. It may be the zeiss is correct & the cooke is wrong, or they are both wrong. Take the lenses to a lens tech to set the lenses, it's very important with wide lenses.

Stephen
 
jimhare said:
Still reading fine in Killara! You guys just need to get Macs! :tongue:
Click to expand...

But then I wouln't be able to see pictures created on 99% of 'puters :devil:

OK, I can see the grabs now on a PC in St. Ives. :) Looks like the images on the right are either out of focus or extremely soft.
 
Steven,
Would you mind clarifying exactly what infinity focusing is on a lens

I thought infinity was everything in focus past the last ft. mark and at/near the infinity symbol.

If you have some time Id like to understand this better.


In any case it's more accurate to say the focus was on the clearance sign.
 
Kip Kubin said:
Steven,
Would you mind clarifying exactly what infinity focusing is on a lens

I thought infinity was everything in focus past the last ft. mark and at/near the infinity symbol.

If you have some time Id like to understand this better.


In any case it's more accurate to say the focus was on the clearance sign.
Click to expand...

Hi,

Infinity would be a star in the sky, a very long war away. I find normal DOF charts don't work with RED, something is either in focus or it's not, making focusing with old cine lenses very hard indeed.

Stephen
 
Please do elaborate more on the subject... hard how? Possibly a new thread might be necessary to discus Red focusing intricacies? On not..? I wouldn't know... but please go on.
 
So if all of your marks are correct then your lenses should in theory be properly calibrated?

That is my understanding at least...

(r)yan
 
(r)yan said:
So if all of your marks are correct then your lenses should in theory be properly calibrated?

That is my understanding at least...

(r)yan
Click to expand...

Hi,

Lenses are collimated at infinity, the lens marks may or may not be accurate, Cooke marks each lens individually, other manufactures have a set of scales, they use the one that fits best.

First the lens needs to be collimated, then the camera, setting the camera to an incorrect lens is not a soloution.

Stephen

Stephen
 
USlatin said:
Please do elaborate more on the subject... hard how? Possibly a new thread might be necessary to discus Red focusing intricacies? On not..? I wouldn't know... but please go on.
Click to expand...

Hi,

Using modern lenses with expanded focus scales (Cooke S4, Ultra Primes, Master Primes, PV Primos) the thickness of the whitnes mark makes a difference when the lens is wide open. How people can possibly accurately focus with older cine glass or still lenses is beyond me. Probably why most of the low budget RED shoots I have seen, many of the shots out of focus.

The very best focus pullers using the best lenses find it very hard, but succeed the majority of the time.

Best,

Stephen
 
Stephen Williams said:
Hi,

I find normal DOF charts don't work with RED, something is either in focus or it's not, making focusing with old cine lenses very hard indeed.

Stephen
Click to expand...

I've found you need to throw away about 2-3 stops to get the charts 'kind' of working.. Final display was a 1080p display (no sharpening) from 3-3.5m.

It is brutal!

Michael
 
Hi,

Lenses are collimated at infinity, the lens marks may or may not be accurate, Cooke marks each lens individually, other manufactures have a set of scales, they use the one that fits best.

First the lens needs to be collimated, then the camera, setting the camera to an incorrect lens is not a soloution.

Stephen
Click to expand...

I was just wondering if my lenses are properly working if they hit all their marks. My lenses have standard to pl adapters on them, and I was being thrifty and bought the adapters from india and I have had to machine them to get them to hit their marks. I am just wondering if I have everything working properly.

(r)yan
 
Stephen Williams said:
How people can possibly accurately focus with older cine glass or still lenses is beyond me.
Click to expand...

Set marks with 1:1 image magnification plus edge focus and you're there. It's the most accurate way to set a mark on RED because you're literally seeing focus. I never miss getting focus right using that method with any lens. (If the camera or talent starts moving and missing marks then that's a different problem)
 
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