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50-135 conversion to screwdrive

Posted 27/10/2023 - 12:12 Link
I seem to recall that a member on here used to offer a service to convert SDM lenses to screwdrive, but I can't remember who, and a couple of searches have failed to produce anything useful.

My much loved 50-135 has suffered SDM failure again (3rd time) and I'm loathe to pay for yet another replacement motor. I've tried to wake it up without success. My research tells me that neither of my bodies - K70 and K-S2 - are able to carry out this process, otherwise I would do it myself.

If you either remember the name of the member concerned or you are that member, can you reply to this thread or pm me please?
Posted 27/10/2023 - 13:58 Link
HarisF1 wrote:
Hi all,

I've seen a quite a bit written about converting the DA* lenses to screwdrive lately and I wanted to offer the service to PU members. I've got a K100d and have converted a bunch of my own lenses to screwdrive in the past so would be willing to help out other members. I'm based in West Yorkshire so drop offs possible. I've seen a guy on the US forum help out loads of their users for a nominal fee + postage so it might work here too.

I've also seen other members discuss their own conversions so maybe we can build a little network of peeps that can do it. I'm wary that members may not want to send their expensive kit off just like that so it'd be nice if you could meet someone local-ish to get it done in an hour or less.

Best Regards

EDIT: Just wanted to add that the conversion would be for 16-50 and 50-135 lenses mainly, although the 200 and 300 can also be converted. I believe the 60-250 is currently not convertable to screwdrive unless a physical modification is made.

Posted 29/10/2023 - 12:01 Link
Thanks Barrie.

You must have a better memory or be better with the forum search than me!

I'll contact Haris directly to see if he's still doing this.
Posted 30/10/2023 - 11:21 Link
I have found that Google works better than the forum search to find things on this forum, just specify pentaxuser in the search terms.
Pentax hybrid user - Digital K3, film 645 and 35mm SLR and Pentax (&other) lenses adapted to Fuji X and Panasonic L digital
Fan of DA limited and old manual lenses
Posted 30/10/2023 - 11:22 Link
I successfully converted my 16-50, 50-135 and 300 lenses nearly 3 years ago. I have the printout of the instructions that I used. Unfortunately there is a reference in the instructions to 'drop box files' and I cannot remember what they contained or indeed even if they are necessary . The original instructions were downloaded from the Pentax Forums site and my attempts a few days ago to open the drop box link was repeatably blocked by ( I think) the Drop Box site.

You are welcome to what I have !

Posted 30/10/2023 - 12:32 Link
Don't you have to have an older body to do it? Can't remember which
Posted 30/10/2023 - 12:35 Link
Was it a K10?
Posted 30/10/2023 - 12:47 Link
You need a K5 (any version) or earlier - K20, K10, K100 etc.

Posted 30/10/2023 - 15:26 Link
Here is the full process on YouTube;

Posted 30/10/2023 - 22:19 Link
Thanks to all for your contributions.

I am now in contact with HarisF1, who is going to do the conversion for me.


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