LENS 16-50/2.8 ED AL SDM DA* Repair

**UncleVanya** · 10-13-2022, 07:15 PM

Originally posted by brianmquinn

I have a K100D that I converted to IR and loved the results I got from it. I later bought some "Broken" lenses (16-50, 50-135, etc) on ebay and convert them using my old K100D to convert these lenses to screw drive. So my old "obsolete" camera got me a bunch of top quality lenes to use with my K-3 and I just took some nice photos with them an hour ago.

The 6mp ccd sensor isn’t bad for some things either.

tmclark · 11-16-2022, 01:26 PM

Originally posted by UncleVanya

You rewrite data on the lens to lie to the camera. Those lenses are designed to use sdm on sdm capable bodies and screw drive on screw drive only bodies. The decision as to which to use is made by the camera after asking the lens about capabilities. By writing data into the lens file it makes the cameras think the lens doesn’t do sdm. This makes the camera use screwdrive. It works very well and so far it’s been future proof and has worked with every body that supports both sdm and screwdrive. Very old autofocus bodies with ONLY screwdrive already work prior to conversion. I check lenses using a k100d which doesn’t work with sdm lenses but can reprogram the lens files. It lets me test screwdrive before converting.

Ok my lens was finally returned today. But now I can't find the instructions, I think I am willing to try. I own a few pentax bodies K5 K10 and an ist. Thank you!!

**UncleVanya** · 11-16-2022, 01:53 PM

Originally posted by tmclark

Ok my lens was finally returned today. But now I can't find the instructions, I think I am willing to try. I own a few pentax bodies K5 K10 and an ist. Thank you!!

Send me a private message and I’ll give you some pointers.

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10-13-2022, 07:15 PM	#16
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,400	Originally posted by brianmquinn I have a K100D that I converted to IR and loved the results I got from it. I later bought some "Broken" lenses (16-50, 50-135, etc) on ebay and convert them using my old K100D to convert these lenses to screw drive. So my old "obsolete" camera got me a bunch of top quality lenes to use with my K-3 and I just took some nice photos with them an hour ago. The 6mp ccd sensor isn’t bad for some things either.

11-16-2022, 01:26 PM	#17
tmclark New Member Join Date: Dec 2011 Location: KBNA Posts: 6 Original Poster	Originally posted by UncleVanya You rewrite data on the lens to lie to the camera. Those lenses are designed to use sdm on sdm capable bodies and screw drive on screw drive only bodies. The decision as to which to use is made by the camera after asking the lens about capabilities. By writing data into the lens file it makes the cameras think the lens doesn’t do sdm. This makes the camera use screwdrive. It works very well and so far it’s been future proof and has worked with every body that supports both sdm and screwdrive. Very old autofocus bodies with ONLY screwdrive already work prior to conversion. I check lenses using a k100d which doesn’t work with sdm lenses but can reprogram the lens files. It lets me test screwdrive before converting. Ok my lens was finally returned today. But now I can't find the instructions, I think I am willing to try. I own a few pentax bodies K5 K10 and an ist. Thank you!!

11-16-2022, 01:53 PM	#18
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,400	Originally posted by tmclark Ok my lens was finally returned today. But now I can't find the instructions, I think I am willing to try. I own a few pentax bodies K5 K10 and an ist. Thank you!! Send me a private message and I’ll give you some pointers.

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