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The way I understand your question, my answer is:
On the SD14, in Manual Mode:
Select the desired shutter speed by rotating the “C†dial. Then hold the +-AV button at the back of the camera to select the desired aperture by rotating the “C†dial.
In A mode (priority to Aperture):
Rotating the “C†dial will select the Aperture. The camera selects automatically the shutter speed.
In S mode (priority to shutter speed):
Rotating the “C†dial will select the shutter speed. The camera selects automatically the aperture.
This is all explained in the SD14 user's manual, from page 37 to 41.
the aperture 1.0 setting works good in most cases.What I experienced are
other problems even with optically really good fullframe manual lenses:
+ heavy CA (chromatic abberations)
+ often difficult to judge the right focus point with the SD14 matte screen
(esp. in low light situations)
+ lenses are more prone to backlight reflections
(than newer Sigma DG lenses) which decreases
overall image contrast and makes it appear less sharp and soft
+ AF viewfinder indicator often wrong w.manual lenses due to
back or frontfocus shift from manual lens adapter (e.g. M42 ring)
My Conclusions:
stick to newer Sigma DG AF lenses - best quality and usable AF !
no real advantage using expensive Zeiss or comparably excellent manual lenses on a SD14
You have to keep in mind that M42 lenses are designed for a register of 45.46mm, and the register of sigma SA mount is 44mm. So make sure your adapter is 1mm thick (I do add some washer between my M42/PK adapter and the M42 lense).
Hi Jeff:
This works for Sigma AF lenses in manual focusing mode, but not for legacy lenses that doesn't have electronics and cannot communicate with the camera. In that case you have to force the aperture in the camera to 1.0, use Av mode and change the aperture manually on the legacy lens.
This is for the Sigma SD14, for the SD9 and SD10 and legacy lenses you have to set the aperture fixed to 5.6.
Regards.
Jes.