DA*50-135 - another


Gamka

Link Posted 30/12/2013 - 15:32
Prompted by GTIS's thread I did a quick check on my lenses - the 50-135 has not been used for a while.

Guess what - it will not focus.

So, went through the various options, full battery, switching on/off, contacts, running it from one end to the other manually and with a fine screwdriver. NOTHING!

So, I tried my other lenses, DA*16-50, DA*300, FA24-90, FA20-30, DFA100 Macro. All work fine.

So, went to my old *istD and the batteries are dead, so back one step to my MZ-S. The DA*50-135 worked perfectly on that.

So, what is the focussing mechanism on the MZ-S? Is it using the drive screw or is it the SDM?

CIBarker

Link Posted 30/12/2013 - 15:37
Yes MZ-S is using screw drive, you'll notice it's no longer silent. I've had this lens with a lazy AF in SDM after prolonged non use, put it back on the DSLR you might find you've woken up the SDM
Best regards

Gamka

Link Posted 30/12/2013 - 15:48
CIBarker wrote:
Yes MZ-S is using screw drive, you'll notice it's no longer silent. I've had this lens with a lazy AF in SDM after prolonged non use, put it back on the DSLR you might find you've woken up the SDM
Best regards

Tried that ... I'll give it another try later or tomorrow though.

SteveEveritt

Link Posted 30/12/2013 - 17:40
Mine wouldn't work on my K-7 but performed perfectly on my K-5iis maybe Pentax have upped the power on the later bodies?
My Flickr link

"Life is what happens to you while you're busy making other plans" (John Lennon)

gtis

Link Posted 30/12/2013 - 19:18
Hi all
I have no other camera to try it on,pity it doesn't revert to screw drive when the SDM fails
I could live with that
cheers Neil
pentax k3 k5 super A
DA* 300 f4 DA* 50-135 f 2.8 smc DA* 16-50 f2.8 50mm f1.7 af 360 fgz pentax1.4xhd converter





Panasonic Dmc Fz200

digikid-tv

Link Posted 31/12/2013 - 16:41
It is possible to edit and rewrite the eprom in the lens to deactivate the SDM so that it is a screw drive only lens on any camera.

See: link

I recently did this to my DA* 16-50 (using a K10D).
John
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