First of all I need to make it right to the SMC Tak 50/1.4 (M42 version) - just
checked again, it is a bit softish at f/1.4, but already at f/1.8 it gets very
good and at f/2 is immaculate
)
Quite recently I obtained a new FS for the 40D, and this is the very first
time the 50/1.4 was checked again - focusing accuracy is of paramount
importance when using shallow DOF, and this was the primary factor
to obtain all these f/1.2 - f/2 lenses after all
.
As to the confirm chip you ordered - do not worry, they are all working
fine, number the pins visible on photos notwithstanding, I've six different
types, all OK (but only one of them was depicted = Aug. 2006, and as
Fate had it it was the one used today with 50/1.4
).
Much more important is machining accuracy of these adapters themselves:
- thickness of the adapter itself (different bodies might have different needs
in this respect, most notably 5D and 1D series);
- and the accuracy of M42 screw position (aperture setting mark should be
at vertical position);
- diameter of the so called aperture flange opening (as you note looking
at the rear of your Taks they all have a little, mechanical lever which moves
when aperture is changed - some adapters are obstructing this movement;
and some are even so tight, that care needs to be taken when screwing
one's lens on the very first time in order not to bend this lever forcefully
as it would necessitate to take the lens apart and to set it right - not a
big deal if one is brave and with nible fingers though) - this is a flat
surface at the back of these adapters which pushes the M/A aperture
pin (not crucial if one's lens is equipped with the mechanical M/A switch);
Unfortunately it is not possible to glean much assurance from these e-bay
descriptions, and only upon arrival you'll be sure 100%. It is also a good idea
if you have many lenses, just to buy these confirmation chips "wholesale"
and then to glue them yourself. As soon as you'd be sure which type works
for you - they can be had for about $20 a piece, or less if ordered in bulk.
And then there are many sources of M42 --> EOS chipless adapters to
play with (Fotodiox makes good ones if you're in US).
Bottom line - recently there is also a new line of confirm chips, which can be
"programmed" to pass to EXIF much more complete and precise information
about shot's data - they are usually with 11-pins though, and not so easy
to get.
FWIW, jpr2
