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Forum: Pentax SLR Lens Discussion
01-16-2019, 08:47 PM
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The 16-50 came back all shiny and new-like, with the tech's comment "seal ring replaced; a complete repair and return all functions to factory specs; complete cleaning (internal - external) and optical system". So I can't tell what was actually wrong with it but luckily it looks like the lens is now usable. I've been able to correct the AF to where I can no longer complain, I guess it's a keeper after all. The repair was a flat fee of $212.50, shipping included.
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Forum: Pentax SLR Lens Discussion
12-29-2018, 08:28 PM
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Paulo, you are seriously bumming me out. I appreciate the comment though :)
I emailed the repair tech to let me know if he wants to me send the camera as well.
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Forum: Pentax SLR Lens Discussion
12-29-2018, 03:03 PM
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I didn't include the camera following most of the advice out there.. which generally says that if other lenses are easily calibrated with the camera, it's probably not the camera but the one bad lens that's at fault.
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Forum: Pentax SLR Lens Discussion
12-28-2018, 06:30 PM
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Shipped off the 16-50 to Precision-Camera today, fingers crossed.
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Forum: Pentax SLR Lens Discussion
12-26-2018, 10:21 PM
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PJV, not at all, I am kind of glad to have suffered through it, I think I can now fine tune any healthy zoom quickly, with my eyes (almost) closed ;)
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Forum: Pentax SLR Lens Discussion
12-26-2018, 10:05 PM
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After about two hours of fine tuning the AF on the 16-50, I have concluded that this specimen is the spawn of the devil himself and as such needs an exorcism by CRIS.
I tried everything, assuring myself of the angles and distances, used a variety of rulers and other objects and still, just as it looked that I have finally converged on the right fine-tune setting, if I then focused on something a little closer or farther, the lens would again be severely off-focus. I am physically exhausted by this process and have used up my entire curse word vocabulary several times over. This lens is going in for a major surgery. Or the trash can. I do own a large hammer...
Thanks everyone for your advice, I greatly appreciate each and every post.
Edit: Apparently CRIS is not the place for Pentax repairs, I will be sending the lens to Precision Camera
Andy
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Forum: Pentax SLR Lens Discussion
12-25-2018, 07:25 PM
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Thank you PJV, I found a decent ruler and plan to take my time adjusting AF at 50mm on the DA tomorrow. Will report on the results. Also thank you everyone who contributed. Btw, I will probably end up also getting the Tamron just to "taste the sharpness".
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Forum: Pentax SLR Lens Discussion
12-24-2018, 01:16 PM
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Hi, I just need to confirm what I've gathered through reading older posts and my own experience with the Pentax lens. These two points appear to be true - please kindly comment.
1. Pentax 16-50 is a varifocal lens. As such, it may be impossible to perfectly fine-tune the AF on both the wide and the long ends at the same time. If one end is well-tuned, the other will most likely back/front-focus.
2. Tamron 17-50 is a par-focal lens and can achieve perfect AF at all focal lengths with a single in-camera AF correction.
I have the Pentax 16-50 and have been fighting with the AF tuning for a while now. Tried averaging the error but can never achieve AF quality on both ends to my satisfaction. I am hoping the Tamron lens will free me from this stress.
Looking forward to your advice.
Andy
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