Modifying lens mount.

aliengrove
Posted 08/01/2010 - 14:19 Link
Probably a daft question, but is there any way of changing the mount on a lens, rather than buying an adaptor? I have a four thirds mount Sigma 10-20mm lens, and would like the same lens for my K7. I am presuming that Sigma put the lens mount on last, after they have manufactured the lens, as this would make more sense than having a seperate production line. If so, can the lens mount be changed? Just seen a damaged Sigma 10-20 on Ebay with a Pentax mount, so was wondering if I bought it whether I could swap the mount over? Failing that, not been able to find any four thirds to PK adapters anywhere. Any ideas anyone?
thoughton
Posted 08/01/2010 - 14:32 Link
Sounds complicated to me! Wouldn't you have to rewire all the electrical connections on the mount? I don't know much about four-thirds, does it have the same number of electrical contacts and do they do the same thing?
Tim
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
FlickrFluidrPPGStreetPortfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!
aliengrove
Posted 08/01/2010 - 14:37 Link
I would think a bit of rewiring would be needed, but I am guessing someone who repairs lenses could do that. Not sure how much it would cost though. Just wondering if changing the mount on a modern lens is feasible and how much soldering etc would be neccessary. Failing that I may just have to sell the lens and buy another.
Hyram
Posted 08/01/2010 - 14:44 Link
aliengrove wrote:
......Failing that I may just have to sell the lens and buy another.
Seems the best option to me.
Hyram

Bodies: K20D (2), K10D, Super A, ME Super, Auto 110 SLR, X70, Optio P70
Pentax Glass: DA* 300, DA* 60-250, DA* 50-135, DA* 16-50, DA 70 Ltd, FA 31 Ltd, DA 35 Ltd, DA 18-55 (2), DA 12-24, DA 10-17, M 200, A 35-70, M 40, M 28, Converter-A 2X-S, 1.4X-S, AF 1.7, Pentax-110 50, Pentax-110 24
Other Glass: Sigma 105 macro, Sigma-A APO 75-300
Flash: Metz 58 AF-1 P, Pentax AF160FC ringflash, Pentax AF280T
thoughton
Posted 08/01/2010 - 14:49 Link
The repairmain will probably run up a £100 bill I would think?! I think you'd be better off just selling the four thirds one, you must be able to get £300 for it? and buying a K mount one for £385 or so.
Tim
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
FlickrFluidrPPGStreetPortfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!
aliengrove
Posted 08/01/2010 - 14:51 Link
Yes I think thats probably the best option. Will stick it on ebay. Thanks for the replies, thought it worth an ask in case it had been done before.

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