12-02-2010, 09:26 PM
[quote name='Klaus' timestamp='1291305836' post='4709']
The AF is slow.
[/quote]
Interesting. At Pentaxforums, Adam wrote that it shines in AF speed and that it is quicker than the Sigma 18-250 HSM. Another forum member wrote it is comparable to screw-drive.
I had a feeling that ravings about the AF speed are probably exaggeration. After all, the DC motor is the budget version for in-lens-motor focusing.
Would you say Sigma HSM is also slow or does it depend on the lens?
Looking forward to reading your findings about the 18-135 AF speed and whether it might have been better to make it screw-drive.
I'm not a fan of motors in lenses unless they are so simple (ring motors) that there is hardly any chance that they can break. Otherwise there is just more stuff that can break (motor, gears, attachment points).
The AF is slow.
[/quote]
Interesting. At Pentaxforums, Adam wrote that it shines in AF speed and that it is quicker than the Sigma 18-250 HSM. Another forum member wrote it is comparable to screw-drive.
I had a feeling that ravings about the AF speed are probably exaggeration. After all, the DC motor is the budget version for in-lens-motor focusing.
Would you say Sigma HSM is also slow or does it depend on the lens?
Looking forward to reading your findings about the 18-135 AF speed and whether it might have been better to make it screw-drive.
I'm not a fan of motors in lenses unless they are so simple (ring motors) that there is hardly any chance that they can break. Otherwise there is just more stuff that can break (motor, gears, attachment points).