Chris, Thanks for that explanation of your experience with 28-135 and 18-110. I've had an 18-110 for years with my FS7 but now with the FX9 there isn't really much need for an APS-C lens. So far though, although I understand the functional differences in the zoom and focus mechanisms, I've remained skeptical mainly because I've only seen 3 but none of them have been parfocal. Now I've had a lot of experience with the 18-110's and Sony has a terrible track record of adjusting these lenses correctly so they hold focus from tele to wide when in manual. Of course it should hold focus when its in AF but the test for parfocal is whether it does it in MF.. They will work perfectly when adjusted properly but its a crapshoot when you buy one and even Sony repair has a bad record of setting them up correctly without it taking a few trips back and forth. Unfortunately most people don't seem to understand what parfocall means anymore so there are hundreds of misadjusted sony zooms out there.
I recently borrowed a 28-135 from a friend who always complained that it was soft. I need to test it compared to my 18-110 but immediately saw that it is way out of the correct parfocal adjustment. its possible the lens isn't soft but he's just been screwed by zooming in , focusing and then pulling back to a no longer in focus wide picture. Its hard to tell even on a monitor sometimes .
I'm wondering what people's experience has been as to whether these tend to be softer than 18-110s and thanks for your input that they are equal optically. i'll test this one next week . But what has been your experience as to whether they are often set correctly or even capable of being parfocal? I figure if they had so much trouble with the 18-110's it might be even worse with the earlier 28-135's.
Actually I'm wondering whether Sony would honor the fact that my friends was never correct and agree to do the adjustment for free. They did that for a friend of mine but her lens was only a few months out of warranty, not years. Otherwise I think its a $600 or more fee for the lens to recalibrated. I';m reluctant to buy a used one for that reason.
Would love to hear from others about 28-135 - parfocal or not? Sharp as the 18-110?
Lenny
I recently borrowed a 28-135 from a friend who always complained that it was soft. I need to test it compared to my 18-110 but immediately saw that it is way out of the correct parfocal adjustment. its possible the lens isn't soft but he's just been screwed by zooming in , focusing and then pulling back to a no longer in focus wide picture. Its hard to tell even on a monitor sometimes .
I'm wondering what people's experience has been as to whether these tend to be softer than 18-110s and thanks for your input that they are equal optically. i'll test this one next week . But what has been your experience as to whether they are often set correctly or even capable of being parfocal? I figure if they had so much trouble with the 18-110's it might be even worse with the earlier 28-135's.
Actually I'm wondering whether Sony would honor the fact that my friends was never correct and agree to do the adjustment for free. They did that for a friend of mine but her lens was only a few months out of warranty, not years. Otherwise I think its a $600 or more fee for the lens to recalibrated. I';m reluctant to buy a used one for that reason.
Would love to hear from others about 28-135 - parfocal or not? Sharp as the 18-110?
Lenny
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