SDM in 16-50mm
Posted 21/03/2020 - 15:34 - Helpful Comment
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There is no real test I don't think.
Some say the SDM is dying when the lens takes it's time starting up but both my 50-135mm and 16-50mm have been like that for years ... when you first mount them nothing happens but after a bit of a wait they spring (not sure that's the right word for the old SDM focus speed tbh) into life and work fine until the next time.
Apparently you can stop the SDM dying by using the lens a few times a month but mine have gone 6 months plus and still (eventually) work.
Some say the SDM is dying when the lens takes it's time starting up but both my 50-135mm and 16-50mm have been like that for years ... when you first mount them nothing happens but after a bit of a wait they spring (not sure that's the right word for the old SDM focus speed tbh) into life and work fine until the next time.
Apparently you can stop the SDM dying by using the lens a few times a month but mine have gone 6 months plus and still (eventually) work.
Posted 21/03/2020 - 21:20
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SDM AF is very slow anyway but especially on the 16-50mm, 50-135mm and 55mm. My 50-135mm has been squeaky since I purchased it years ago.
To be honest unless you got the lens for a very good price (SDM repair is around £150-£200) I would probably send it back as you sound unhappy with it and if so it will always be on your mind. If you decide to keep it and the SDM does fail then it would probably be more cost effective to convert it to screw drive.
To be honest unless you got the lens for a very good price (SDM repair is around £150-£200) I would probably send it back as you sound unhappy with it and if so it will always be on your mind. If you decide to keep it and the SDM does fail then it would probably be more cost effective to convert it to screw drive.
Posted 22/03/2020 - 05:03 - Helpful Comment
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Contact Pramath
02082328111 - 02085606856
Asahi Photo Technical
AKA:
BRENTFORD RADIO CONTROLLED MODELS
6 Albany Parade, High Street, Brentford
TW8 0JW
Did 5 DA* SDMs for me with latest motors
Prompt turnaround and very economical compared to others.
Lenses were transformed; much faster and totally reliable. Standing the test if time and heavy use.
02082328111 - 02085606856
Asahi Photo Technical
AKA:
BRENTFORD RADIO CONTROLLED MODELS
6 Albany Parade, High Street, Brentford
TW8 0JW
Did 5 DA* SDMs for me with latest motors
Prompt turnaround and very economical compared to others.
Lenses were transformed; much faster and totally reliable. Standing the test if time and heavy use.
Daronl
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71 posts
14 years
Edinburgh