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Post by craigh on Sept 19, 2007 19:46:16 GMT -5
I thought the Fuji screwmounts had an extra pin & only worked on Fuji's. If this is so, would that be the same with the Tamron adaptor?
Craig
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Post by John Farrell on Sept 19, 2007 20:08:17 GMT -5
Full aperture metering on Fujica M42 cameras started with the ST705, according to the table here: www.pentax-manuals.com/fujica/cameras/m42_bodies.htmThe ST705 and later bodies have a locking pin in the lens mount. The lenses have a corresponding dimple. This is needed to ensure the aperture simulator lug lines up correctly.
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Post by Rachel on Sept 20, 2007 2:54:23 GMT -5
I thought the Fuji screwmounts had an extra pin & only worked on Fuji's. If this is so, would that be the same with the Tamron adaptor?Craig Yes Craig, they do have an extra pin as does the equivalent Tamron adaptor. It's on the aperture setting ring. However I've found that they will mount OK on most M42 cameras.
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Post by camerastoomany on Sept 20, 2007 9:13:51 GMT -5
Hi Rachel,
I just tried a Mamiya/Sekor 50mm f2 SX on my Fujica St901 comparing it to the Fujinon 50mm 2.2 I normally have on the 901. The meter comes up with a two stop difference. eg on the 901, the Fujinon comes up with 1/30 @ 5.6 while the SX is 1/30 @ 2.8.It's 10pm here and I am indoors. Pointing the camera at areas of varying light intensity seems to consistently give the same two stop difference. Using the above example, the SX lens, back on its Mamiya is very close to 1/30 @ 5.6. My Sekonic lightmeter agrees with 1/30 @5.6.
So, my brief and admittedly primitive test, suggests that interchanging those lenses and cameras gives unreliable results.
I can add that the cameras in question, when fitted with own brand lenses provide quite accurate meter readings.
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Post by Rachel on Sept 21, 2007 14:36:34 GMT -5
Thanks Geoff for doing that test. I tried it the other way with a Fuji lens(Tamron) on my Mamiya DSX1000 and thought the readings were the same. I can see that I will have to try it again It would be surprising if they were compatible I suppose
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Post by Rachel on Sept 25, 2007 6:37:36 GMT -5
I have now acquired a Tamron Mamiya MSX/DSX mount and it is very similar to the Fuji ST mount but the aperture follower cam is about one to two stops different which supports Geoff's measurements. Thanks for all the input on this.
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Post by pentaxgraflex on Oct 7, 2007 21:01:07 GMT -5
The Olympus FTL's also used the locking pin with aperture ring lug to communicate aperture info. Only Pentax and Praktica were different. I like Fuji's approach better than Pentax's. Praktica's electronic system was OK I guess, but over here wide and long lenses were impossible to find for them.
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Post by Rachel on Oct 8, 2007 7:12:48 GMT -5
I have a Tamron Pentax ES mount and the aperture follower is a cam inside the lens mount.
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Post by gazolba on Dec 18, 2007 15:59:26 GMT -5
All Fujica camera models commencing ST are screwmount as is the AZ1. The bayonet mount cameras are prefixed STX or AX. Open aperture metering started with the ST705 which was a development of the ST701. I'd be surprised if the open aperture cam is compatible with any other make but you can check it by running some tests. I doubt whether anyone knows the answer so research will be fruitless. Tamron made an Adaptall 2 mount specially for the Fujica ST. Make sure yiou gert the ST mount and not just the regular M42 mount. You can then use the top-notch Tamron Adaptall lenses.
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Post by Rachel on Dec 19, 2007 7:37:37 GMT -5
Hi gazolba. Thanks for the input. We've established that the Fujica ST and Mamiya SX systems are very similar and are almost interchangeable but are a few stops out from each other. I'm using a Tamron lens, with the correct adaptor, on my Mamiya DSX 1000 at the moment.
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Post by Stuart Walker on Dec 20, 2007 8:16:36 GMT -5
I have a Fujica AZ-1 which came with a Sigma zoom lens to suit the open aperture metering. It has the notch to engage with a stop pin in the camera mount and a lug on the aperture ring which engages a pin on the ouside of the mount which is sprung to a stop in the anticlockwise direction. The aperture ring moves this pin in a clockwise direction as you stop down. I ssume this is connected to a potentiometer inside the camera, similar to the Praktica, except that theirs is in the lens. I have another Sigma zoom which has the aperture lug on the inside of the mount and a locating lug instead of a notch, sounds a bit like the Pentax ES mount mentioned above. I was considering modifying this to mate with the Fujica mount, but it's probably not worth the effort. Anyway one would need to check that the aperture ring moves the same amount from stop to stop first. It sounds like the Mamiya and Fujica must be similar but the start points are different, thereby giving you the couple of stops offset. One would need both types of lens and check if the lug is in different places for the same aperture setting.
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Post by Rachel on Dec 20, 2007 14:49:15 GMT -5
Hi Stuart. There seems to be a plethora of different "open aperture" systems for M42 mount cameras.Your other Sigma lens does sound like a Pentax ES fitting although I only have that Tamron mount and not the camera. Likewise I don't have any Fujica M42 cameras either.
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Post by Stuart Walker on Dec 20, 2007 15:35:54 GMT -5
It seems so. If anyone is interested there is a Fujica ST705 repair manual here: www.pentax-manuals.com/fujica/fujica.htmand you can indeed see that there is an aperture variable resistor inside the camera, p22, which is adjusted by the lens aperture ring. Presumably other manufacturers, (except Praktica who put the resistor in the lens, but same principle), had something similar, but there was no standard. Hm, could this be an excuse to collect all the different types?
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Post by Rachel on Dec 20, 2007 15:49:32 GMT -5
.............................. Hm, could this be an excuse to collect all the different types? Get thee behind me Sa....
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PeterW
Lifetime Member
Member has Passed
Posts: 3,804
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Post by PeterW on Dec 20, 2007 17:51:08 GMT -5
In my case, Rachel, he did. And he pushed me towards collecting cameras. PeterW
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