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Help! Trouble with Zeiss Super Speeds!

Zeiss Lens super speeds prime lens problem tech support

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#1 Hannah

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Posted 14 July 2013 - 12:27 AM

I'm using some rented Zeiss Super Speeds (T1.3) on a film I'm shooting on a Red Scarlet. When I tested them at the rental house everything seemed perfect, however now that I am using them outdoors I've found that when I stop down in bright sunlight (or any sunlight really) I can see the iris closing, leaving a kind of pale spot in the middle of the frame. Any advice would be greatly appreciated! 


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#2 Dom Jaeger

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Posted 14 July 2013 - 08:47 PM

Most likely a reflection somewhere that lets you see back into the lens. Are you using filters? Are you shielding the lens with a mattebox or some kind of shade? Oily or otherwise shiny iris blades can also cause an iris to reflect internally under strong light.


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#3 Hannah

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Posted 14 July 2013 - 08:58 PM

I am using ND 4 x 5.65 filters and a matte box. Is there anything more I can do? It's putting a real damper on my aperture choices. 


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#4 Gregg MacPherson

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Posted 14 July 2013 - 09:56 PM

You could check for light leaks into the MB.  Throw a black cloth over the MB and lens and they will dissapear


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#5 Dom Jaeger

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Posted 15 July 2013 - 12:20 AM

I would play with the setup and try to isolate the cause -  use a black cloth like Gregg suggests, remove or tilt filters, place the camera in shade, shade the mattebox further with flaps or french flags etc. Is it only happening when you're facing the sun, is it every lens?

 

 


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#6 Hannah

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Posted 16 July 2013 - 11:14 AM

The anomaly occurs with all but two lenses in bright sunlight. I did some tests yesterday and it seems that the only thing that really gets rid of the reflection is placing a flag over half of the lens, no other flagging or cloth does the trick. I think it must be oily blades, I'm going to contact the rental house.


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#7 Brian Drysdale

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Posted 16 July 2013 - 11:21 AM

You need to use your full real name, it's one of the forum rules.


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#8 Hannah

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Posted 16 July 2013 - 11:22 AM

Whoops sorry about that! 

 

 

errrrm, as of this moment I can't figure out how to change that setting on my profile. Once I resolve this issue I'll delete my account and re-register I promise! My name is Hannah Getz.


Edited by Hannah, 16 July 2013 - 11:26 AM.

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#9 Stuart Brereton

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Posted 16 July 2013 - 11:42 AM

I've had the same problem in the past with Super Speeds. Never found the problem, just assumed it was down to old coatings. The only solution was to use hard mattes and flag the lens like crazy.


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#10 Kieran Scannell

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Posted 16 July 2013 - 03:26 PM

Is it with the wider lenses your seeing this? Might be a flange focus problem. 


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#11 Reuel Gomez

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Posted 17 July 2013 - 11:50 PM

You need to use your full real name, it's one of the forum rules.

Wow, that came out of nowhere.
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#12 Adrian Sierkowski

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Posted 18 July 2013 - 10:53 AM

Real names is a big deal on this forum. It's only appropriate to follow the rules thereof.


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