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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 09 Apr 2018 (Monday) 15:17
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Canon EF-S Focusing Screen on 40D

 
happyduck
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Apr 09, 2018 15:17 |  #1

My 40D is fitted with the Canon EF-S Focusing Screen I dont really like, is it easy to take out or should i get it done with a PRO thank you...Ray


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Wilt
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Post edited 14 days ago by Wilt.
     
Apr 09, 2018 17:06 |  #2

40D focusing screens are very easy to remove...read p. 162 of the owner manual for instructions.
Be sure to use the menu selection for the focus screen to change back to your standard screen, or you might encounter metering error.


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happyduck
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Apr 10, 2018 02:39 |  #3

Wilt wrote in post #18603350 (external link)
40D focusing screens are very easy to remove...read p. 162 of the owner manual for instructions.
Be sure to use the menu selection for the focus screen to change back to your standard screen, or you might encounter metering error.

Thank you my friend, but the last bit about encounter metering error has changed my mind, ive decided to leave well alone your advice is appreciated...Ray


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BigAl007
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Apr 14, 2018 11:12 |  #4

happyduck wrote in post #18603678 (external link)
Thank you my friend, but the last bit about encounter metering error has changed my mind, ive decided to leave well alone your advice is appreciated...Ray


There is no problem at all with metering with any of the bodies with interchangeable screens, as long as you use one of the genuine Canon made ones. As they can affect the metering though when you do change the screen for a different type you do need to change the screen type in the IIRC custom menu settings. There is an entry for each of the screen types that Canon make. It's really easy to do, just like changing any other camera setting.

What is a little disappointing to many who would like to use predominantly manual focus lenses is the fact that Canon don't make any screens with MF focus aids such as a split prism or fresnel rings. Some third party screen manufacturers do make screens like this for the cameras, but these don't have available settings in the menu. Because the focus aids can have a significant effect on the amount of light passing through them, it affects the lightmeter sensor which is located in the pentaprism above the screen. Unfortunately the amount of light that can be lost through one of these screens is also variable with the maximum aperture of the lens. Something that would be difficult with even a relatively fast telephoto zoom with variable maximum aperture. Split image prisms and fresnel rings really only work well when used with lenses faster than ƒ/2.8.

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Wilt
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Post edited 9 days ago by Wilt.
     
Apr 14, 2018 11:17 |  #5

happyduck wrote in post #18603678 (external link)
Thank you my friend, but the last bit about encounter metering error has changed my mind, ive decided to leave well alone your advice is appreciated...Ray

hey, waitasec...changing the menu setting from Ef-S back to (standard screen) Ef-A, when you swap out the Ef-S screen back to the standard Ef-A...should NOT at all be a deterent to you!

If you use Ef-S screen with Ef-A menu setting, you introduce metering error. If you use Ef-A screen with Ef-S menu setting, you introduce metering error
If you use Ef-A screen with Ef-A menu setting, you introduce no metering error. If you use Ef-S screen with Ef-S menu setting, you introduce no metering error
I was merely alerting you to the need to match the screen type with the menu setting.


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Canon EF-S Focusing Screen on 40D
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