ZX-30 v. Sigma lenses

c a sugg · 09-24-2010, 06:39 AM

I have a ZX-30 where the autofocus fails on the two Sigma film capable lenses I have:
28-80 Aspherical Macro (came with camera and works on an SF1)
28mm 1.8 EX DG
With both it sounds like a clutch is slipping.

However, the AF works just fine with:
DA 1:3.5-5.6 18-55mm AL II
New Tamron AF 17-50mm 2.8 IF
Too bad neither will cover the format.

Is the camera wearing out or do Sigma lenses require more torque than this model delivers? This camera was a gift and had been overhauled about 3 years ago, but for transport issues.
BTW, the Sigma zoom is fully usable on my K200d. Not a bad lens at all.

Last edited by c a sugg; 09-24-2010 at 06:40 AM. Reason: punctuation

Adam · 09-25-2010, 08:43 AM

If the lenses work on other cameras, it sounds like you might need to put fresh batteries into your ZX-30!

c a sugg · 09-27-2010, 05:02 AM

New, in date, Energizer e2 Lithiums. Are there counterfeits floating around? Shutter and transport sound fine.

09-24-2010, 06:39 AM	#1
c a sugg Forum Member Join Date: Apr 2009 Location: Richmond, VA USA Photos: Gallery Posts: 88	ZX-30 v. Sigma lenses I have a ZX-30 where the autofocus fails on the two Sigma film capable lenses I have: 28-80 Aspherical Macro (came with camera and works on an SF1) 28mm 1.8 EX DG With both it sounds like a clutch is slipping. However, the AF works just fine with: DA 1:3.5-5.6 18-55mm AL II New Tamron AF 17-50mm 2.8 IF Too bad neither will cover the format. Is the camera wearing out or do Sigma lenses require more torque than this model delivers? This camera was a gift and had been overhauled about 3 years ago, but for transport issues. BTW, the Sigma zoom is fully usable on my K200d. Not a bad lens at all. Last edited by c a sugg; 09-24-2010 at 06:40 AM. Reason: punctuation

09-25-2010, 08:43 AM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,595	If the lenses work on other cameras, it sounds like you might need to put fresh batteries into your ZX-30! Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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09-27-2010, 05:02 AM	#3
c a sugg Forum Member Join Date: Apr 2009 Location: Richmond, VA USA Photos: Gallery Posts: 88 Original Poster	New, in date, Energizer e2 Lithiums. Are there counterfeits floating around? Shutter and transport sound fine.