SMC Pentax-m 35-70mm 2.8-3.5 Focus/ aperture mark not line up.

D1N0 · 05-06-2019, 04:45 AM

I've discovered that the focus mark (red line) and the aperture mark (diamond shape) are not line up on my copy of this lens. The lens doesn't look tampered with and operates very smoothly. The selected aperture is at the first leg of the first m in mm in stead of at the red diamond shape. Pictures i see online do have this properly lined up. Could this be a manufacturing error?

It should look like this:

Last edited by D1N0; 05-07-2019 at 08:58 AM. Reason: added pf sample pic

pschlute · 05-06-2019, 05:45 AM

I suggest someone has had that lens apart and has put the aperture ring back on misaligned.

D1N0 · 05-06-2019, 06:45 AM

Originally posted by pschlute

I suggest someone has had that lens apart and has put the aperture ring back on misaligned.

The aperture ring isn't the part that is misaligned. It is the lens barrel itself, the fixed non zooming part.

pschlute · 05-06-2019, 08:24 AM

Originally posted by D1N0

The aperture ring isn't the part that is misaligned. It is the lens barrel itself, the fixed non zooming part

When you mount the lens on the camera and look directly down on it, are the focal length indicators not in the 12 o'clock position ?

D1N0 · 05-06-2019, 08:30 AM

Originally posted by pschlute

When you mount the lens on the camera and look directly down on it, are the focal length indicators not in the 12 o'clock position ?

Only the one on the zoom ring, not the diamond shape on the barrel above the aperture ring.

**gofour3** · 05-06-2019, 08:38 AM

Yeah the barrel is off about 1/2 inch compared to my copy.

Phil.

**tonyzoc** · 05-06-2019, 06:03 PM

Does infinity focus correctly or is it short or go past infinity. I don't know that lens particularly but on some lenses barrel parts are positioned with set screws. If infinity is off, the the entire front and focus were reassembled incorrectly. If infinity is good maybe just that barrel part with the red line is mispositioned. Either way it's hard to fix unless you know how to disassemble...zoom lenses are complicated to work on.

D1N0 · 05-07-2019, 02:33 AM

Infinity is fine. I will leave the lens alone

glasbak · 05-08-2019, 11:39 AM

Originally posted by D1N0

Only the one on the zoom ring, not the diamond shape on the barrel above the aperture ring.

loosen the 3 screws in the knurled part, and then you can re position the barrel, or shift it up to see some internals.

D1N0 · 05-08-2019, 02:16 PM

Originally posted by glasbak

loosen the 3 screws in the knurled part, and then you can re position the barrel, or shift it up to see some internals.

Thanks, I will try that once I work up the courage to.

05-06-2019, 04:45 AM	#1
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802	SMC Pentax-m 35-70mm 2.8-3.5 Focus/ aperture mark do not line up. I've discovered that the focus mark (red line) and the aperture mark (diamond shape) are not line up on my copy of this lens. The lens doesn't look tampered with and operates very smoothly. The selected aperture is at the first leg of the first m in mm in stead of at the red diamond shape. Pictures i see online do have this properly lined up. Could this be a manufacturing error? It should look like this: Last edited by D1N0; 05-07-2019 at 08:58 AM. Reason: added pf sample pic

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05-06-2019, 05:45 AM	#2
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,198	I suggest someone has had that lens apart and has put the aperture ring back on misaligned.

05-06-2019, 06:45 AM	#3
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802 Original Poster	Originally posted by pschlute I suggest someone has had that lens apart and has put the aperture ring back on misaligned. The aperture ring isn't the part that is misaligned. It is the lens barrel itself, the fixed non zooming part.

05-06-2019, 08:24 AM	#4
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,198	Originally posted by D1N0 The aperture ring isn't the part that is misaligned. It is the lens barrel itself, the fixed non zooming part When you mount the lens on the camera and look directly down on it, are the focal length indicators not in the 12 o'clock position ?

05-06-2019, 08:30 AM	#5
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802 Original Poster	Originally posted by pschlute When you mount the lens on the camera and look directly down on it, are the focal length indicators not in the 12 o'clock position ? Only the one on the zoom ring, not the diamond shape on the barrel above the aperture ring.

05-06-2019, 08:38 AM	#6
gofour3 Site Supporter Join Date: Oct 2008 Location: Vancouver, Canada Posts: 8,090	Yeah the barrel is off about 1/2 inch compared to my copy. Phil.

05-06-2019, 06:03 PM	#7
tonyzoc Loyal Site Supporter Join Date: Jul 2018 Posts: 992	Does infinity focus correctly or is it short or go past infinity. I don't know that lens particularly but on some lenses barrel parts are positioned with set screws. If infinity is off, the the entire front and focus were reassembled incorrectly. If infinity is good maybe just that barrel part with the red line is mispositioned. Either way it's hard to fix unless you know how to disassemble...zoom lenses are complicated to work on.

05-07-2019, 02:33 AM	#8
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802 Original Poster	Infinity is fine. I will leave the lens alone

05-08-2019, 11:39 AM	#9
glasbak Veteran Member Join Date: Apr 2009 Location: Netherlands Posts: 369	Originally posted by D1N0 Only the one on the zoom ring, not the diamond shape on the barrel above the aperture ring. loosen the 3 screws in the knurled part, and then you can re position the barrel, or shift it up to see some internals.

05-08-2019, 02:16 PM	#10
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802 Original Poster	Originally posted by glasbak loosen the 3 screws in the knurled part, and then you can re position the barrel, or shift it up to see some internals. Thanks, I will try that once I work up the courage to.