Showing results for 
Show  only  | Search instead for 
Did you mean: 

using a laowa fisheye 4mm 2.8 lens on a canon r7 lens


I recently bought a Laowa 4mm 2.8 fisheye lens with RF mount to use on my Canon R7. Every time I try to take a photo, the shutter will not depress. I have tried every camera setting I can think of, have removed the lens and reattached it several times , tried to take photos from different distances, and the shutter will not engage when I try to take the photo. The only feedback I get on the camera display is a waving hand. Anyone have any suggestions?                                                 



While your lens has an RF mount, it does not have any of the electrical contacts that a digital camera needs to connect with.  So the camera doesn't know there is a lens and doesn't want the shutter to fire. To use this all-manual lens on the R7, you have to look for the Custom Function setting Release shutter w/o lens” and select it.

Do you have the user manual for the camera? You will find this information in it.



You need to set the camera to "M" manual shutter and "Release shutter w/o lens" .

EOS 1DX and 1D Mk IV and several lenses!
08/18/2023: Canon EOS R5 C training series is released.

07/31/2023: New firmware updates are available.

CR-N700 - Version 1.2.0

CR-N500 - Version 1.3.0

CR-N300 - Version 1.3.0

CR-X300 - Version 1.1.0

06/30/2023: New firmware version is available for EOS-R5 C

05/31/2023: New firmware updates are available.

EOS R6 Mark II - Version 1.1.2

EOS R6 - Version 1.8.2

EOS R7 - Version 1.3.1

05/18/2023: New firmware updates are available.

EOS Rebel T100 - Version 1.1.0

EOS Rebel T7 - Version 1.2.0

EOS 5D Mark IV - Version 1.4.0

EOS 6D Mark II - Version 1.2.0

PowerShot Elph 360HS - Version

PowerShot SX420 IS - Version

PowerShot 620 HS - Version

PowerShot SX720 HS - Version

PowerShot G1X Mark III - Version

PowerShot G7X Mark II - Version

PowerShot G9X Mark II - Version


04/20/2023: New firmware version 1.4.1 is available for EOS R3

03/30/2023: New firmware updates are available.

EOS R5 - Version 1.8.1

EOS 1DX Mark III- Version 1.7.1

Speedlite EL-1 - Version 1.0.2

03/30/2023: Product Advisory for EF50 F1.2 L USM

03/30/2023: Product Advisory for EOS R10

02/24/2023: We've updated Share Your Photos

2/07/2023: New product announcements!

EOS R8 EOS R50RF-S55-210mm F5-7.1 IS STMRF24-50mm F4.5-6.3 IS STMRF15-30mm F4.5-6.3 IS STM
01/09/2023: Help ensure your autofocus is properly aligned with a Canon Precision Alignment
01/03/2023: Welcome to CES 2023!
12/08/2022: New firmware version is available for EOS C70
12/07/2022: New firmware version 1.7.0 is available for EOS R5