OK, just shot the series again, this time using tripod, live-view, and cable release.
To my eye these results make it rather undecided, as I reckon none are quite as sharp as the two handheld without TC, but I reckon it may be my old eyes.
I would add that I don't think my tripod is without a bit of vibration either. I really need a decent way of taking that out of the equation too. I have tried a suspended bag of bricks in the past, but if can't stop that from moving it juts adds to the problem.
Anyway, here are the tripod shots, as before first two with TC, last two without.
Cheers,
Terry
---------- Post added 01-02-16 at 09:46 PM ----------
Originally posted by colonel00 I don't know either but they look quite different. even the framing of the envelope is different like you were closer or cropped it differently? Just pointing out observations which could lead to puzzling results. As darylk mentions, test with different focusing methods as well.
All the first set shot from approx the same place (within 500mm) but there wasn't a standard crop used for all, just cropped by eye. I was only looking for sharpness differences, so minor crop differences are not (in my view) important.
Cheers,
Terry