The 5 Lens Autofocus Drive Types Explained - Articles and Tips ...
WEBAug 19, 2018 · 3. Micro Ultrasonic / Piezo Motor ("SDM") The "old style" micro SDM is being used in the DA ★ 50-135 mm F2.8 ED [IF] SDM. SDM uses an ultrasonic piezo technology driven motor which is the size of a small DC motor. It still uses gears to focus.
New SDM Motor - Digital Photography Review
WEBNew SDM Motor. Sep 20, 2021. 13. I procrastinated re repairing my 60-250 but am glad I did, it is very snappy on my K3III. Cost including delivery from CRK was $280A. Here's the little critter. View: original size. CRK always return the faulty part which is good customer relations IMO, I can't speak too highly of them. -- hide signature --
DIY SDM repair! - PentaxForums.com
WEBJan 29, 2011 · I recently got at tip about a blog post from [a certain banned user from this forum] that referred to another Chinese Pentax user on a forum thread who had successfully repaired his 16-50 with SDM failure. The repair is quite simple and consists of turning the back part of the SDM motor itself apparently …
SDM Motor Lens - Pentax K20D First Impressions - AnandTech
WEBMar 11, 2008 · The 16-50 f2.8 fast wide angle to short telephoto (24-75mm equivalent) features a lens motor and sealing against dust and moisture, just like the K10D and K20D camera bodies.
Pentax (lens) - Wikipedia
WEBSupersonic Drive Motor (SDM) The Pentax-developed SDM autofocus systems, with SDM standing for "Supersonic Drive Motor", departs from the previous Pentax system which utilizes a screw-drive autofocus motor inside the camera body. Instead, SDM lenses incorporate an autofocus micro-motor as part of the lens itself.
equipment damage - What would cause a Pentax SDM lens to …
WEBI've read many reports that the SDM autofocus motor in some Pentax lenses may stop working after several months or years of use. Why does this happen, and is there anything I can do to prevent failure or restore a lens with a failed SDM (aside from sending it …
SDM failure - PentaxForums.com
WEBJan 19, 2021 · Here is the status of the four SDM lenses I own: 16-50mm f2.8 – converted to screw drive; 55mm f1.4 – SDM motor failed and replaced in 2020; 50-135mm f2.8 – intermittent fault where it freezes up; 300mm f4 – works fine
Pentax SDM motor - Digital Photography Review
WEBFeb 16, 2010 · Pentax shouldn't be very proud of the fact that the SDM in their expensive DA* lenses are being compared to the cheapest micro-USM used in lenses costing about 1/4th the price. Try removing your rose tinted spectacles for a minute. http://www.fredmiranda.com/forum/topic/698047/0.
Got a bad SDM lens? Most of them can be converted to screw drive!
WEBMar 13, 2019 · My DA* 16-50's SDM motor has been a piece of shit almost since day one, which is a common tale amongst Pentax users. The motor has been replaced numerous times, both in and out of warranty, and I'm just tired of dealing with it.
PLM vs DC vs SDM? - Digital Photography Review
WEBApr 10, 2021 · The PLM design can quickly activate and allow for faster focusing, but the lens element must be low weight due to limited power (torque). The DC motor can generate high power (torque) with deceleration mechanisms, which is better for lenses with larger focusing elements.
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