Originally posted by Lowell Goudge OK
I just checked ny 8 element Tak 50.
First of all, I have verified this is the 8 element based not only on protruding rear element, but also the focus mark, serial number and weight of the lens. Let's all just assume here this is a true 8 element version.
I went out, to push the lens to the extremes. I have the origonal Takumar 50F1.4 lens hood for this lens, not just any hood.
If I shoot into the sun, lens stopped down, with the sun just beyond the corner of the lens, I get a good amount of flare stopped down, with a clear purple patch in the middle of the image
with the sun at almost angles, and stopped down all the way, It may be possible that there is some small purple in the middle of the image also, but no other flare.
With the sun behind you , or in the shade, there is no issue. It is probable this is internal reflection in the lens. and I will need to do more tests.
Just for the record, my lens has a SMC skylight filter on it.
edit note
the lens performe a whole lot better with the much longer hood of the 135F3.5 attached, and no apparent vignetting.
Still, however, I can see when shooting into the light even when no noticible flare, a little purple tinge or shading to shots, shen stopped right down.
Second edit note, First tests on my *istD, still there but less obvious on my K10D
Thanks everyone for your help.
Lowell - I appreciate your effort there very much!
My lens has the curved rear surface, has the red index to the right of the f4 (when viewed from behind the camera) and has S/N 1314318 so I am sure that it is the 8 element.
Looks like you pretty well reproduced my results!
(I believe that any attempt to use a filter of any description will only make matters worst?)
I also have the genuine 135/3.5 hood and I will try that tomorrow.
Lowell have you ever done any sharpness testing between the 8 element and the 'Super Multi Coated' version? I believe that the only difference is "character"?