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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 :)

Firecrest

Lee Kelly

Lee Kelly

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I know this is reduser, but many of you also work with a certain German camera. Does anyone know if IRND is required for that other camera sensor?
I am about to upgrade my ND setup but thinking of keeping my Platinums for use when the new mini hits the streets, incase it still requires IR protection. From what I understand, my Dragon will not need IR protection?

Do the Firecrest NDs look as good on that German sensor?
 
Dragon does not need IR filtration.
Here is an old video that shows how Alexa and Epic MX need IR filtration:
https://vimeo.com/55452414

I used to use a Hoya UV & IR Cut filter on my BMCC. I'm not familiar with the top IR filters nowadays though. I'm sure these other guys know what's being used now.
 
You really do need to trust the findings of colleagues on resources like this, or do a hell of a lot of testing with the various cameras we are asked to shoot these days and then either invest in several variations of ND or hope your local rental house has what you need, and that their own in-house guys are researching the results that legends like Phil Holland put forward.
In a few ways, shooting film was almost easier to repeat results to a small degree...

I was hoping to see if anyone knew if the Amira or Mini has any improvements on IR contamination from the original Alexa sensor.

I have just found a set of screw in Firecrests that will get me through for the time being and I wont throw out my Platinums just yet, but where does this gear accumulation end!!!
I have to hide camera gear from my wife, like she hides her new shoes!!!
 
The Amira and Mini have built-in full spectrum NDs with IR protection so you should only need to carry glass ND 0.3-0.9 to get the exact stop you want. So no need for IRNDs there either.
 
Satsuki Murashige said:
The Amira and Mini have built-in full spectrum NDs with IR protection so you should only need to carry glass ND 0.3-0.9 to get the exact stop you want. So no need for IRNDs there either.
Click to expand...

Correct, but there will also be shooters who don't want to be using the behind the lens filtration at times. Especially if shooting fast and wide.
 
Phil, do you think you would see a loss of sharpness with Arri's behind-the-lens filters in those situations? They are part of a motorized assembly, so the 'clear' position will also have a clear filter that can't be easily removed in the field.
 
Hi Satsuki
Hope all is well.
You do need IRND or Firecrest filters in 0.6 and 0.9 on the Amira if you use the internal ND2.1. The IR contamination is there.
Haven't tested the Mini yet.

John Chater
San Francisco
 
Hiya John,

Well, good to know - thanks for the heads up! Guess I'm going to have to come by the shop to do some testing then. Will see you soon.
 
Satsuki Murashige said:
Phil, do you think you would see a loss of sharpness with Arri's behind-the-lens filters in those situations? They are part of a motorized assembly, so the 'clear' position will also have a clear filter that can't be easily removed in the field.
Click to expand...

It's not so much a sharpness issue, though that can occur, it's more about the enhancement of certain artifacts like Chromatic Aberrations or even smearing of light exiting the lens pupil. All lenses aren't created equally and each lens design's light path can be more ideal or less ideal for rear filtration use. In my experience the lenses that reveal the most weirdness with behind the lens filtration are wides and ultra wides. It's all got to be tested though in case there's other magical optical things going on in those filters for instance.

Everything plays a role in the optical path. Photosites, microlenses, OLPFs, etc..... What's important to you? What's acceptable? When is it important? Is it an issue? Does it work well with lens X, Y, or Z? Yep. Still reasons to do camera tests when receiving a camera or before a production.
 
Phil Holland said:
It's not so much a sharpness issue, though that can occur, it's more about the enhancement of certain artifacts like Chromatic Aberrations or even smearing of light exiting the lens pupil. All lenses aren't created equally and each lens design's light path can be more ideal or less ideal for rear filtration use. In my experience the lenses that reveal the most weirdness with behind the lens filtration are wides and ultra wides. It's all got to be tested though in case there's other magical optical things going on in those filters for instance.

Everything plays a role in the optical path. Photosites, microlenses, OLPFs, etc..... What's important to you? What's acceptable? When is it important? Is it an issue? Does it work well with lens X, Y, or Z? Yep. Still reasons to do camera tests when receiving a camera or before a production.
Click to expand...

Awesome info. Thanks for sharing, Phil. As always. Good to know about wides and rear filtration - I would never have known that!!
 
Nick Morrison said:
Awesome info. Thanks for sharing, Phil. As always. Good to know about wides and rear filtration - I would never have known that!!
Click to expand...

Doesn't happen with every lens, but the second it does you'll be scratching your head trying to figure it out.
 
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