09-15-2010, 01:25 AM
[quote name='Vieux loup' timestamp='1284484133' post='2749']
Technical question; My Sigma 50mm 2,8 macro has a diaphragm control ring which I must lock in P and S mode and need do nothing else. Wen using the A and M mode, you have to "unlock the button and set the diaphragm value by turning the ring". <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/huh.gif' class='bbc_emoticon' alt='
' /> I have never seen this! What does it actually mean? Do I have to adjust this for every different shot? I apologize in advance if my question is stupid, but would appreciate your help <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' /> Kindly Ignorant Wolf
[/quote]
That feature is only if you want to use the aperture ring on the lens. You don't have to use that ring. Just lock it at the smallest aperture (largest number) and have the camera set to automatically control aperture using the scroll wheel in front of the shutter button (default) and you are set. No need to adjust for every different shot.
Technical question; My Sigma 50mm 2,8 macro has a diaphragm control ring which I must lock in P and S mode and need do nothing else. Wen using the A and M mode, you have to "unlock the button and set the diaphragm value by turning the ring". <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/huh.gif' class='bbc_emoticon' alt='
' /> I have never seen this! What does it actually mean? Do I have to adjust this for every different shot? I apologize in advance if my question is stupid, but would appreciate your help <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='' /> Kindly Ignorant Wolf[/quote]
That feature is only if you want to use the aperture ring on the lens. You don't have to use that ring. Just lock it at the smallest aperture (largest number) and have the camera set to automatically control aperture using the scroll wheel in front of the shutter button (default) and you are set. No need to adjust for every different shot.