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New Contributor
Posts: 2
Registered: ‎07-17-2019
Accepted Solution

50mm f/1.8 won’t open wider than f/4.

I have the mark iv body. I just purchased the ef 50mm f1.8 lens. I can’t get the aperture wider than f4! What am I doing wrong? thank you!
Esteemed Contributor
Posts: 3,414
Registered: ‎02-17-2016

Re: 50mm f/1.8 won’t open wider than f/4.

Are you in manual mode?

 

Does it open wider for focus?

New Contributor
Posts: 2
Registered: ‎07-17-2019

Re: 50mm f/1.8 won’t open wider than f/4.

yes, I am in manual.
Esteemed Contributor
Posts: 3,414
Registered: ‎02-17-2016

Re: 50mm f/1.8 won’t open wider than f/4.

Someone else had this issue, and I believe it was related to the Auto-ISO limits.

VIP
Posts: 11,351
Registered: ‎12-07-2012

Re: 50mm f/1.8 won’t open wider than f/4.

Reset your camera. Always, always when something doesn't do as it is supposed to do, do a full camera reset. Clear all settings and all custom settings. The camera is probably doing exactly what you told it to do but you don't remember what or you changed something accidentally.

EOS 1DX and 1D Mk IV and several lenses!
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Frequent Contributor
Posts: 37
Registered: ‎04-01-2019

Re: 50mm f/1.8 won’t open wider than f/4.

In the custom functions menu #2 there is a Set Aperture Range where you can limit the min and max aperture setting. See page 488 in the manual.

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