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07-25-2020, 10:37 AM   #1
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Reassemble aperture ring on my 50mm 1.4?

I am an astrophotographer and noticed some dust shadows when taking flat fields the other night before shooting the comet. I took off the bayonet back and lifted the aperture ring. I should not have done that. The detent pin and its TINY spring and two other small, thin pieces of silver metal came out without me seeing where they came from and how they were situated. I am heading to Wyoming to shoot in 48 days. I am looking for help. Does any have a diagram of how these parts fit back together. Does anyone know someone reliable who to whom I could send the lens for cleaning and reassembly that could get it back to me in less than 48 days? Does anyone know of a video somewhere that would tell me what I need to know? At this point, I would live with the dust if I can just get the ring reassembled properly. Thank you all for your help.

07-25-2020, 10:42 AM   #2
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While I don't know about the technicalities this might help:
Pentax Lens Disassembly Database - PentaxForums.com

Edit: As for the shadows I doubt they are caused by dust in your lens.
07-25-2020, 10:44 AM   #3
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QuoteOriginally posted by Spica66 Quote
Reassemble aperture ring on my 50mm 1.4?
Hi,

Welcome to Pentax Forums.

First, to offer a consolation -- the aperture-ring spring and its associated parts (e.g., 1-mm ball) are known to fly off despite care taken by the repair person. It's a learning experience, sadly.

Could you please let us know which lens, specifically? (SMC Pentax (K), Pentax-M, Pentax-A, etc)

(Edit: I've posted at your other thread)

Were you able to recover the small parts?

- Craig

Last edited by c.a.m; 07-25-2020 at 11:11 AM.
07-25-2020, 11:09 AM   #4
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QuoteOriginally posted by c.a.m Quote
Hi,

Welcome to Pentax Forums.

First, to offer a consolation -- the aperture-ring spring and its associated parts (e.g., 1-mm ball) are known to fly off despite care taken by the repair person. It's a learning experience, sadly.

Could you please let us know which lens, specifically? (SMC Pentax (K), Pentax-M, Pentax-A, etc)

Were you able to recover the small parts?

- Craig
All parts were recovered . This is a manual focus SMC PENTAX-A 1:1.4 50mm

---------- Post added 07-25-20 at 11:11 AM ----------

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07-25-2020, 11:11 AM   #5
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QuoteOriginally posted by Spica66 Quote
All parts were recovered . This is a manual focus SMC PENTAX-A 1:1.4 50mm
Great!

I've posted at your other thread in "SLR Lens Discussion"

- Craig
07-25-2020, 11:12 AM   #6
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This is a K-mount lens.
07-25-2020, 11:29 AM   #7
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BTW welcome to the forum, seems you have found help
07-25-2020, 12:33 PM   #8
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I do appreciate the help. Now: A Pop Quiz. What is the worst sound you can hear when "repairing" a lens? Answer: The sound of the 1mm x 2mm detent when it flies out of the bag and into your incredibly messy office somewhere. After vacuuming for an hour, and shoving a magnet up against the wall to get under the baseboard cracks, I still did not find it. At least it is only for the "A" aperture setting which I never use. I reassembled without it and the aperture works properly.for the manual stops. Does anyone know anyone who still works on these old lenses? I would still like to get it cleaned. And, if possible, get the circled part replaced. Thanks in advance, Dave.

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07-25-2020, 02:53 PM   #9
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QuoteOriginally posted by Spica66 Quote
. . . Does anyone know anyone who still works on these old lenses? I would still like to get it cleaned. And, if possible, get the circled part replaced. Thanks in advance, Dave.
Welcome to the forums

you will find friendly members and knowledge here

follow the link to find active links to possible repair people

QuoteQuote:
US
KEH.com (GA, Most current and vintage gear)
Eric Hendrickson (Vintage cameras, Current and vintage lenses)
Precision Camera (Authorized to perform warranty service, NC)
Advance Camera (Most current and vintage gear, Portland, OR)
General Camera Repair (LA, CA)
Garry's Camera Repair (IL, select film SLRs)
International Camera Repair (LA, CA)
Halcyon Cameras | Vintage Camera Restoration (Vintage film cameras, San Diego, CA)
Camera Repair Japan (Services Sigma lenses and more, Atlanta, GA)
Allied Camera (MN, manual film cameras)
Bill Rogers Camera (LV, NV, film-era cameras and lenses)
Phototronic (Topeka, KS, film and digital camera repair)
Lezot's Camera Center (VT, film SLRs / medium format)
Read more at: Pentax Repair Facilities (Wordwide listing) - Page 9 - PentaxForums.com

I have used Phototronic to repair a broken 150-450mm zoom and was quite pleased.

http://www.phototronictopeka.com/

here is the owners reviews for that lens:

https://www.pentaxforums.com/lensreviews/SMC-Pentax-A-50mm-F1.4-Lens.html

Last edited by aslyfox; 07-25-2020 at 03:25 PM.
07-26-2020, 01:45 AM   #10
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Welcome aboard, I'm sure someone here on the forum will be able to help with your self repair, good luck.
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