Originally posted by derAngler Hello Dave,
thank you for your lens reviews. You wrote that the sweet spot of your lenses is around f11/13. I cannot share this opinion. All lenses I tested so far (35mm, 55mm, 75mm, 120mm, 150mm, 80-160mm) had their best performance between f8 and f9.5. I always compare the different f-stop settings on a 27 inch iMac through the Lightroom compare view in 100% magnification. And in all cases the f8/9.5 pictures are sharper than the f11/13.
I would say that f8 is the best setting for all lenses with a starting aperture of 4.0 or lower and f9.5 is the best setting for lenses with an aperture higher than 4.0.
dA
They might be sharper at a single point, but when you want the whole scene to be in focus you have to compromise and use a smaller aperture. For landscapes I shoot between f/11 and f/22 depending on the lens. The 45 - 85 is a fantastic lens which does not in my opinion suffer too much from diffraction at f/22. Besides, in all honesty pixel peeping at 100% is pretty much a rhetorical exercise. if you have a shot printed at 64in x 24 in as I have you aren't going to be looking at it at 100%. Print at 18 x 12 and he differences will be harder to see due to smaller size.
In the end you have to choose the lenses that work for you at the aperture you would like to use them at. So I judge on what looks great around f/11 - 16. I'd rather have a shot that was focussed how I would like it to be focussed and not be optimally sharp at 100% than have a shot that is optimally sharp at 100% but out of focus for half the scene. It's no use having perfect leading lines to a perfectly sharp subject when those leading lines are soft due to it being out of focus, even just by a little bit.