First of all, bcause it is a f5.6 lens, it technically becomes a f8 fi you combine it with a TC14 and as a consequence you loose the majority of the AF sensors and AF speed. The exact number depends on the camera model, but the problem is the same including the top pro bodies. So I would say forget about the TC with the 500PF unless you make long distance shoots of dead animals
...., well slow moving objects should be o.k. Apart from that the effect of TC's on IQ varies depending on the lens/TC combination, but there is somebody who wrote some interesting stuff about it that is probably worthwhile to take a look at.
One is a
general article around TC's including giving a kind of guideline for
estimating IQ drop by TCs (exemplary test done with a 70-200 FL VR), the other one looking at the
differences between TC-14E II and III. Would be interesting to compare this with experiences made by the people here.
Well, before anybody starts to shout "forget lab tests, go out and try": I know that there is always a difference between lab and real world but I think that as always the truth is somewhere in the middle. This is why I like the things
@Steve is doing in his reviewsso much, where he does a decent real world fied test combined with tests that are more "lab-like" just to make it easier to see the effects he is talking about. One good example related to TC is his
500PF review. There he compares the 500PF and the 300PF + TC14 showing that beside a TC being able to decrease resolution it also can add CA with lenses that normally has a problem with that (in this case the 300PF).
In this context I would love to know if somebody out there has experience with comparing the 70-200 FL VR + TC14 with the 300PF.
