@MikeSowsun wrote:There are 2 types of STM AF motors. One type is slightly noisy and the other type is virtually silent.
The EF 50mm f/1.8 STM has the noisier motor and what you are hearing is normal.
If if you were to use an external Microphone you can reduce or even elimate the AF noise.
Lead-Screw STM
- +PRO = FAST and Completely Silent
- - NEG = BIG SIZE motor = Bigger lens size, weight, and COST
- used in canon 18-55 STM, 18-135 STM and 55-250mm STM
Lead Screw Type STM
Gear Type STM
- +PRO = tiny compact, lightweight, cost effective
- - NEG = small motor = slower performance. Not completely silent due to gears
- used in canon 24 STM 40 STM 50 STM
Gear Type STM
STM lenses are generally recommended for use with Dual Pixel AF when shooting video. But, not all STM lenses are listed as being compatible with DPAF. The two types of STM motors seems to explain it perfectly. All of the prime lenses you mentioned, with gear type STM motors, are not listed as being compatible with DPAF.
Some lenses are just too noisy for shooting video because the onboard microphone will pick up the focusing noises within the lens body too easily.
@Waddizzle wrote:STM lenses are generally recommended for use with Dual Pixel AF when shooting video. But, not all STM lenses are listed as being compatible with DPAF. The two types of STM motors seems to explain it perfectly. All of the prime lenses you mentioned, with gear type STM motors, are not listed as being compatible with DPAF.
Some lenses are just too noisy for shooting video because the onboard microphone will pick up the focusing noises within the lens body too easily.
This Dual Pixel AF Compatibility Chart says the gear type 40mm f/2.8 is compatible with Dual Pixel AF. The EF 40mm f/2.8 STM is the first gear type STM lens and I am guessing the chart is not up to date.
This is the first time I have heard that gear type STM lenses are not compatible, and a quick Google search didn't show any for me either.
Where did you hear that gear type STM lenses are not compatible?
@MikeSowsun wrote:
@Waddizzle wrote:STM lenses are generally recommended for use with Dual Pixel AF when shooting video. But, not all STM lenses are listed as being compatible with DPAF. The two types of STM motors seems to explain it perfectly. All of the prime lenses you mentioned, with gear type STM motors, are not listed as being compatible with DPAF.
Some lenses are just too noisy for shooting video because the onboard microphone will pick up the focusing noises within the lens body too easily.
This Dual Pixel AF Compatibility Chart says the gear type 40mm f/2.8 is compatible with Dual Pixel AF. The EF 40mm f/2.8 STM is the first gear type STM lens and I am guessing the chart is not up to date.
This is the first time I have heard that gear type STM lenses are not compatible, and a quick Google search didn't show any for me either.
Where did you hear that gear type STM lenses are not compatible?
Mike, I think you may have missed part of my point. But, first, I did not say I heard that gear type STM lenses are not compatible with DPAF, per se. Your chart lists a number of lenses that are compatible with DPAF, but that does not mean that they work well in Movie Servo AF mode.
I was allluding to my experiences with video mode and Movie Servo AF. You definitely want to use only select STM lenses. Your chart is identifying those lenses that will work with DPAF in LIve View mode shooting stills, which does not necessarily translate to working well in Movie Servo AF mode.
At the end of this article, Rudy Winston alludes to the fact that STM lenses perform better when shooting video.
https://www.usa.canon.com/internet/portal/us/home/learn/education/topics/article/2018/July/Intro-to-...
But, he does not go into any detail. “Oh, by the way, you want to use STM or nano-USM lenses when shooting video.” One major difference is how much noise some lenses make. Many lenses have surprising noisy apertures, which is easily picked up by the in-camera microphone. When shooting stills, the shutter typically drowns it out. So, while the lens might seem quiet when it focuses, many of them are quite audible when the aperture moves.
There are only a few STM lenses that can do it all. DPAF began in the Cinema EOS line.
https://community.usa.canon.com/t5/Cinema-EOS-Discussions/C100-MKII-Auto-Iris/m-p/166028#M501
Look at Tim’s comment in this article. He lists the 4 STM lenses that are compatible with all of the video focusing and tracking features, including auto aperture control and facial tracking. Remember, this is for shooting video, not tracking to shoot stills. When you are shooting video, you must maintain focus.
