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| Re: FD 85/1.2 SSC Asph. to EOS Guide |
The spring is not needed if you follow Cogitech's method completely.
Note that in the example (55 f1.2 SSC) in your link, the author installed a spring, so that he could use the original lever on the aperture ring (that means no need to make/install a new lever!) Another example is the 55 f1.2 Asp SSC (I have one and did similarly.) I simply drilled one single hole for the spring attachment and no other work for the aperture linkage.
This is another conversion example for the 55 f1.2 SSC. In this example, the author didn't use a spring, so he made a new lever (by combining the original lever with the new part.) Now judge for yourselves which way is easier .
I think it would be fair to say, for some cases, one may find it easier to attach a spring and use existing lever (or make a simple one) than to make and install a new lever with more precision requirement. Now, of course, it is not always possible to install a spring! Anchoring points for the spring do not always pre-exist. And there may be simply no room for the spring, or the spring will get in the way when the lens tries to focus to infinity.
So most of the time you just have to make a precise lever and be done with it. And it is likely to be the case with the 85 f1.2 (SSC or L). I haven't received the 24Asp yet .