anders_br_the Posted November 17, 2005 Share Posted November 17, 2005 I have just bought a second hand Mamiya-Sekor C 180/4,5 lens for my RB67 pro-s. To my consternation I saw right away there was something funny with this lens; the aperture scale read a maximum of 3,8, and minimum aperture was 32! And the flash mode selector between X and M has a small screw locking it in the X mode. It was rated excellent, but the other excellent rated lenses I have bought from this vendor has been in better shape. It is supposed to be 4,5 wide open and 45 minimum as far as I am informed. Has anyone ever seen this before? Or are some 180's only f32 minimum? What would you do about this? Link to comment Share on other sites More sharing options...
paul ron Posted November 17, 2005 Share Posted November 17, 2005 ummm.... sounds like someone did a switch of glass to another lens body, perhaps the shutter of the original was shot and not knowing how to install a shutter, he just swapped out the glass to another body. SEND IT BACK! The more you say, the less people listen. Link to comment Share on other sites More sharing options...
marck mcgill Posted November 18, 2005 Share Posted November 18, 2005 I don't think the lenses would fit another barrel... Can't it be, instead, a 127mm with just the front ring (the one bearing the writings, around the front lens) "borrowed" from a 180mm? Agree: send it back to where it came from. Link to comment Share on other sites More sharing options...
neil_grant Posted November 18, 2005 Share Posted November 18, 2005 Sounds like you have the wrong lens. Uniquely, i believe, the RB 180mm has a shutter behind the entire optical train - have quick look. Link to comment Share on other sites More sharing options...
jmf Posted November 18, 2005 Share Posted November 18, 2005 I bought a lens where that small screw trick had been done. It's to keep you from accidently setting the flash sync to M. The max apeture is printed on the front of the lens. There should also be a green "C". What does yours say? Assuming it says 4.5, it looks like somebody swapped shutters with another lens. That alone would be a reason for it to go back. Care to share the name of the vendor? Link to comment Share on other sites More sharing options...
anders_br_the Posted November 18, 2005 Author Share Posted November 18, 2005 Thanks you all for replying. The lens front is marked Mamiya-sekor C (with green C) f=180mm 1:4,5. It has the aperture and shutter behind the optics which fits well with Neil's description. I don't have a 127 to compare to, but i guess as has benn pointed out that this is a 180 with a shutter/aperture from a different lens. I think I will return it. There is really no way for me to know what the true aperture is. And with such a "repair" it makes me wonder what else may be hidden. I wrote the vendor a mail last night complaining. I think I will await their response before i decide wether to publish their name. I must say i have had only good experince with them before. So i'm a bit surprised and annoyed by this latest aquisition from them. Thanks all for your input. I appreciate it. Link to comment Share on other sites More sharing options...
paul ron Posted November 18, 2005 Share Posted November 18, 2005 The threaded mount will take any of the glass from the other lenses but the actual mount is different setting up a different front to film plane distance. The 180 doesn't have a rear cell, there is a rectangular mask, so screwing in the glass is simple enough. It probably works just fine enough if all you paid is $50. Gee, I can reall use that shutter if the vendor is willing to sell it to me cheap? The more you say, the less people listen. Link to comment Share on other sites More sharing options...
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