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john murphy
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, February 12, 2006 - 05:32 pm: | 
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I have a spiraltone 135 mm lens with nikon mount that was loose between the mount ring and lens body,tighned up the three set type screws but noticed the pointed end of one was broken,any ideas where to get a replacement?i am new to this hobby.also i have a question on the operation of this lens.the aperture ring is at the lens opening end and is aluminum and works but there is a second ring marked with aperture settings that does not control the aperture and moves independently of the other ring,does not appear to do any thing i am guessing that this was used with some kind of adapter lens that screwed onto the front of the lense.any help in the proper operation of this vintage lens would be of help.am planning on using it on a nikon fm since it is a manual set camera anyway.thanks |
Glenn middleton
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, February 12, 2006 - 06:38 pm: |
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This a preset manual lens. The second ring allows you to preset the aperture to the exposure meter value. You then focus with the lens fully open and then just turn the aperture ring proper to close down the lens to preset value. You do not need to take camera from the eye to set the correct value.
So for an aperture of say 5.6, you would set the preset ring (your second ring) so that 5.6 was aligned with the datum line. If you now turn the aperture ring from the fully open position, you will find that it will not turn to a smaller value than 5.6.
As for your screw, the loss of the point does not prevent the screw from locking the mount on the barrel. It is when the driver slot gets broken that you start to worry. Scrap lenses are the best source of these screws. |
John Shriver
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, February 12, 2006 - 07:40 pm: |
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That's probably a T-2 interchangeable mount on the back of the lens, the three set-screws hold onto a ring that threads onto the rear of the lens. The setscrews allow you to properly index the lens, without the manufacturer having to get the threads to end at exactly the right place.
The setcrews are almost certainly metric.
http://john.shriver.home.comcast.net |
john murphy
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, February 13, 2006 - 08:59 am: |
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thank you for the answer and the operating instructions. |
M Currie
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, February 15, 2006 - 01:35 pm: |
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By the way, I have one of those old Spiratone preset T-mount 135's, and if yours is like mine, you'll find that it makes a rather nice portrait lens, and renders out-of-focus areas very nicely, a quality popularly called "good bokeh." |
