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  1. #1
    Join Date
    Nov 2008
    Location
    Monmouthshire, UK
    Posts
    2,152

    Minolta 50mm f1.7 probs

    The other day the aperture on my Minolta 50mm f1.7 prime stuck wide open. I suppose that after 25years service (I've had it from new), a problem might be anticipated but I was still horrified (like losing a good friend).
    The cost of a professional repair is likely to be pretty high so I got a service manual from Pete Ganzel and got to work. Three hours later, after washing the iris blades in detergent I had the whole thing back together. I think lubricant from the Helicoid got on the blades! Why now?
    Going to go out now and take some shots to see if it works.

    Peter
    Attached Images Attached Images  

  2. #2
    Join Date
    Nov 2008
    Location
    Monmouthshire, UK
    Posts
    2,152
    Geez, sorry about that ginourmous pic. Should have been like this!
    Attached Images Attached Images  

  3. #3
    Join Date
    Dec 2007
    Posts
    2,562
    I like a man who isn't afraid of diving on things. I am the same way it can't get anymore broken. When the AF on my Quantary lens started grinding I took it apart and removed the AF drive gear so I could use it in MF only. That looks a little more complicated. I hope everything works out for you. After that operation you can open a lens repair shop.
    Good Luck
    Frank

    PS I can't wait to see what Don has to say.
    Sony A77
    Sony A580
    Sony A 100
    Maxxum 400si.
    Sony 18-70 Kit Lens
    Minolta AF 35-70
    Minolta AF 50 f/1.7
    Tamron 70-300 f/4-5.6 Di LD
    Tamron 60mm Macro
    Tamron 17-50 f/2.8
    Tamron 2x Converter
    Sony HVL-F42AM
    Quantaray 70-300 4.5-5.6 Macro
    Slingshot 200 Bag



    http://www.flickr.com/photos/22083244@N06/

    http://s305.photobucket.com/albums/nn219/sparkie1263/

  4. #4
    Join Date
    Nov 2008
    Location
    Monmouthshire, UK
    Posts
    2,152
    Thanks, Frank.
    I've taken a few test shots and the lens is as good as new; best of all it didn't cost anything (well $25 for the service manual).

    I've attached a couple of 100% crops; straight out of the camera no post processing, just downsized, text added and compressed. Nothing memorable about them except look at the sharpness at 1/15th sec hand held. The anti shake system never ceases to amaze me and all thanks to Sony for continuing the Minolta tradition and making my collection of lenses usable. The only annoying thing is how Sony are overpricing the new lenses considering the anti shake system is in-camera.

    Peter
    Attached Images Attached Images   
    Last edited by Peekayoh; 11-29-2008 at 08:11 AM. Reason: Spelling

  5. #5
    Join Date
    Dec 2007
    Posts
    2,562
    Looks great. I wll keep you in mind next time I need my lens repaired.
    Frank
    Sony A77
    Sony A580
    Sony A 100
    Maxxum 400si.
    Sony 18-70 Kit Lens
    Minolta AF 35-70
    Minolta AF 50 f/1.7
    Tamron 70-300 f/4-5.6 Di LD
    Tamron 60mm Macro
    Tamron 17-50 f/2.8
    Tamron 2x Converter
    Sony HVL-F42AM
    Quantaray 70-300 4.5-5.6 Macro
    Slingshot 200 Bag



    http://www.flickr.com/photos/22083244@N06/

    http://s305.photobucket.com/albums/nn219/sparkie1263/

  6. #6
    Join Date
    Nov 2008
    Location
    Monmouthshire, UK
    Posts
    2,152
    It'll get it's feet wet! I'm in the UK.

  7. #7
    Join Date
    Jun 2008
    Posts
    2,204
    Finally turned that Sig 10-20 back in eh? Hope everything comes back in tip top shape!
    flickr

    Canon 7D - 5D | 550EX - 430EX II - (2) PW FlexTT5 | 24-105 f4L | 70-200 f2.8L IS | 100 f2.8L IS | 50 f1.8 II

  8. #8
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
    Posts
    9,560
    Yeah ... I hate buying new lenses only to have to return them. It is a little maddening. I have waited and waited ... and SIGMA burns me every time. Well ... 'tis the season to be jolly, right? Fine ... I'll keep their lenses repair staff in business.

    4-6 weeks, they tell me.
    Don Schap - BFA, Digital Photography
    A Photographer Is Forever
    Look, I did not create the optical laws of the Universe ... I simply learned to deal with them.
    Remember: It is usually the GLASS, not the camera (except for moving to Full Frame), that gives you the most improvement in your photography.

    flickr & Sdi

  9. #9
    Join Date
    Oct 2008
    Location
    Raleigh, NC, USA
    Posts
    788
    Wow, I totally missed this thread when Peekayoh posted it, because I was heads down with exams. Thanks for posting the pics, it's very cool to see the inside. Impressive job of cracking it open and fixing the problem.

    Nice to see the fixes on your lenses Don. About how much did it cost for the repairs, if you don't mind me asking?
    Jason Hamilton
    Selective Frame

    EOS 5D - Canon EF 24-85mm f/3.5-4.5 USM, EF 35 f/2, EF 50mm f/1.8 Mk II, EF 70-210 f/3.5-4.5 USM, EF 85mm f/1.8 USM, EF 100mm f/2.8 Macro, Helios 44-2 58mm f/2 (with EOS adapter), 430EX, Canon S90
    Nikon FE - Nikkor 35mm f/2 AI'd, Nikkor 50mm f/1.8 AI, Nikkor 105mm f/2.5 AI, F to EF adapter, 2xVivitar 285, other lighting stuff
    Mamiya C220 - 80mm f/2.8

    Gear List flickr

  10. #10
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
    Posts
    9,560

    Cool Addressing repair costs ... it is the same for everyone

    Quote Originally Posted by laydros View Post
    Nice to see the fixes on your lenses Don. About how much did it cost for the repairs, if you don't mind me asking?
    Came down to a standard charge of $88.60 per lens, if all they have to do is clean, lube and focal adjustment.

    Now, I just (as a matter of fact) took a call from United Camera concerning my KM 24-105mm f/3.5-4.5 and they are quoting a repair cost of $156 and a two/three-week turnaround. So ... you guys might buy your lenses second-hand ... but, the "hidden costs" for these focal adjustments is where they get you.

    Remember, this second-hand 24-105 came from B&H Video, basically "as is." I believe I paid around $329 or so for it. So, you tack the repair costs on top of that, and we're back up around the $469 a new one costs! Plus the inconvenience of running the lens back and forth to the repair center and the time you are without it.

    "As is" wound up being an unusable lens, in my estimation (worse than the kit, in the condition it arrived in) ... so even dealing with an "established" retailer is chancy. Best advice , buy "new" (with the precious warranty) or from some one you can trust (who takes care of their stuff) and who won't screw you for a buck! "As is" is not the same as "As was!"

    But, I have to say ... when they come back from "repair" ... they ARE working optimally. I am assured their focus is "dead-nuts" and that's cool, because of late ... as many of you know, I have had some poor results with OOTB performance, having to return several sealed lenses back to the manufacturer for warranty repair/adjustment. I figure if we drive those costs to them high enough, they may just start investing some time in factory-level Quality Assurance/Quality Control to improve the original product in the box. As always, it is a question of costs ... and having them stop the hemorrhaging is the best business move I can think of.

    I have worked in manufacturing for the past twenty years ... and I know that this is an area that can always use improvement. If they can get away with chopping this QA/QC effort out ... THEY WILL! It is "overhead" ... and I will not let them put that cost on me or my family. They get it back, at their cost and they can fix it. I will not allow the store to SWAP it out for a "new" one only to return home and take the chance that it is out of alignment, too. E-gads! Obviously, if it is truly broken, that's one thing ... but, out of adjustment ... it goes to repair.

    Sorry, after 50 years of dancin' on the planet ... we do it right.
    Last edited by DonSchap; 12-17-2008 at 09:37 AM.
    Don Schap - BFA, Digital Photography
    A Photographer Is Forever
    Look, I did not create the optical laws of the Universe ... I simply learned to deal with them.
    Remember: It is usually the GLASS, not the camera (except for moving to Full Frame), that gives you the most improvement in your photography.

    flickr & Sdi

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