New DSLR - Pentax K5
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27-03-11, 09:45 PM
Join Date: Nov 2010
Location: South East England
Originally Posted by
Question: I have bought a Sigma 17-70mm to fit to the K5, yet frequently expereience problems opening the aperture (2.8) below 4.5; possibly due to a software issue, or has this been expereinced before? I also have the ist DL body, no problems there.
Which version of the 17-70 do you have mkauff? - the f2.8-4.5 DC Macro or the f2.8-4.0 DC Macro OS HSM?
Presumably you mean no f2.8 at 17mm focal length, which is the only focal length that gives full aperture. If that is the case, what shooting mode are you using and what happens if you try to reduce the aperture to f2.8 with the e-dial when the lens is set to 17mm focal length? Does the problem occur regardless of which shooting mode you set on the mode dial?
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