C100: C100 MKII: Auto-iris

George Loch said:
Does the auto-iris feature work with any L glass or the cine glass?

-gl
Click to expand...

I don't know about the Cine glass, but it works with all my L glass. I was dragged through the mud for championing this very convenient button, and was told I didn't know how to set correct exposure. Truth is it gets you pretty much in the ball park when you are shooting outside, inside it's pretty worthless, because the Auto iris button always wants to go below fully opened up.
 
There seems to be a lot of misinformation here.

The auto-iris feature should work with any EF or EF-S lens that the camera can control the iris function electronically. Is that correct, Michael?
 
drummondb said:
There seems to be a lot of misinformation here.

The auto-iris feature should work with any EF or EF-S lens that the camera can control the iris function electronically. Is that correct, Michael?
Click to expand...

Yes, I have a 50mm 1.4. 70-200 f4, and a 24-105 and it works on all of those. Considering you can't change the shutter speed, all you are left with is the aperture, and the ISO, and the ND filters, and you have no control over the sun...... it's a very convent button.
 
Again - I own a c100 Mk2 for 4 weeks now: The "Push Auto Iris mode" (Pressing the dedicated Button) works with L Lenses.

The "Auto iris Mode" (Automatic Aperture without pressing a button) only works with the 4 STM Kit Zooms.
 
franzschuier said:
Again - I own a c100 Mk2 for 4 weeks now: The "Push Auto Iris mode" (Pressing the dedicated Button) works with L Lenses.

The "Auto iris Mode" (Automatic Aperture without pressing a button) only works with the 4 STM Kit Zooms.
Click to expand...

Im confused, I know about the "push auto Iris" button, but never heard of "automatic aperture" the only other way to adjust the aperture is with the dial on the handle...... I have a MK 1 perhaps it's different on the MKII?
 
There are two "automatic" functions for Iris.

  • One: Push Auto Iris. When this physical button is held, the camera will automatically control your iris to bring your image into proper exposure. (What the camera considers "proper exposure" is heavily influenced by the "Light Meter" mode you are in, Menu>Camera>Light Meter). This function works with all EF lenses that have electronically controller apertures, so pretty much all but the Cine-Class.

  • Two: Fully Automatic Iris. This is automatic Iris, all of the time, as if you were holding down that Push Auto Iris button permanently. This can be turned on in the Menu System (Camera>Iris>Mode) but is only supported by certain STM lenses.


Method one is really designed for just quickly getting you to the proper exposure, where method two is designed to continuously keep you exposed. My assumption is method two only works with STM lenses because the aperture steps can be controlled smoother in those lenses, and it results in a smoother more subtle exposure change.

Personally, I only ever use Push Auto Iris when outside shooting live events.
 
Macaholic said:
There are two "automatic" functions for Iris.
  • One: Push Auto Iris. When this physical button is held, the camera will automatically control your iris to bring your image into proper exposure. (What the camera considers "proper exposure" is heavily influenced by the "Light Meter" mode you are in, Menu>Camera>Light Meter). This function works with all EF lenses that have electronically controller apertures, so pretty much all but the Cine-Class.
  • Two: Fully Automatic Iris. This is automatic Iris, all of the time, as if you were holding down that Push Auto Iris button permanently. This can be turned on in the Menu System (Camera>Iris>Mode) but is only supported by certain STM lenses.

Method one is really designed for just quickly getting you to the proper exposure, where method two is designed to continuously keep you exposed. My assumption is method two only works with STM lenses because the aperture steps can be controlled smoother in those lenses, and it results in a smoother more subtle exposure change.

Personally, I only ever use Push Auto Iris when outside shooting live events.
Click to expand...

thanks for the clarification . I didn't know about that, probably because I don't have any STM lens...... Maybe a good reason to get one!
 
Macaholic said:
There are two "automatic" functions for Iris.
  • One: Push Auto Iris. When this physical button is held, the camera will automatically control your iris to bring your image into proper exposure. (What the camera considers "proper exposure" is heavily influenced by the "Light Meter" mode you are in, Menu>Camera>Light Meter). This function works with all EF lenses that have electronically controller apertures, so pretty much all but the Cine-Class.
  • Two: Fully Automatic Iris. This is automatic Iris, all of the time, as if you were holding down that Push Auto Iris button permanently. This can be turned on in the Menu System (Camera>Iris>Mode) but is only supported by certain STM lenses.
Method one is really designed for just quickly getting you to the proper exposure, where method two is designed to continuously keep you exposed. My assumption is method two only works with STM lenses because the aperture steps can be controlled smoother in those lenses, and it results in a smoother more subtle exposure change.

Personally, I only ever use Push Auto Iris when outside shooting live events.
Click to expand...

This information is correct. I don't understand why, because the IRIS change is quite smooth on L Lenses when you set the IRIS Increment to "FINE".

I bought the 10-18 STM to test this when using the camera on a gimbal and moving from in- to outdoors f.e. - IRIS change is very smooth and could be really handy in some situations on a gimbal, BUT the lens does not stand up to L lenses of course... practically unusable indoors (Sharpness is bad at wide open).
 
franzschuier said:
This information is correct. I don't understand why, because the IRIS change is quite smooth on L Lenses when you set the IRIS Increment to "FINE"
Click to expand...

I imagine the smoothness isn't as consistent among all the tens of L-Series lenses as it is on the newer and fewer STM. And it's more of a subjective decision.

I don't consider my 24-105mm lens' iris smooth enough to do subtle changes when rolling if my image is going to anything bigger than a phone.

The last thing I would want is to think that the adjustments aren't noticeable when shooting, only to find clear stepping on my screen in post.

Just another example of Canon playing it safe vs. letting us test and decide for ourselves.
 
You must log in or register to reply here.
Back
Top