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checkoutmygrass.JPG
26-Oct-2013

checkoutmygrass.JPG

Canon EOS 60D
1/1000s f/8.0 at 85.0mm iso400 full exif

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Lensrentals03-Nov-2013 00:34
Nerdy commentary: I've always thought that the term "focal plane" is a
misnomer, and that many of the problems people have with focus in the
corners is a product of the crazy shape of the focal surface, which
probably doesn't remotely resemble a plane in many cases, especially for
near focus. I trail run with a 30 year old $14 ZU 50mm f/1.8 from KEH,
which focuses down to about 16", and I make use of this all the time. I
simply prefocus to the min setting on the lens, and then move back and
forth until I'm happy with the shot. I've been pretty happy with that
procedure, and even that lens, until a friend loaned me an EF 85mm f/1.8.
This was a part of a series of shots playing with the idea of Treholm's
The Ins and Outs of Focus, where for landscapes with a small enough
aperture setting focusing on infinity "may" be more effective than using
the hyperfocal setting. I put "may" in quotes because it doesn't always
work out that way for me here in CO, despite the theory I often find
something in-between works best simply because the foothills with visible
trees are more than 5 mi away and the snow-capped peaks are 15 to 20 mi
away, so diffraction is horrible. Anyway, on a lark I took one shot for
reference, focusing on the bottom of the scene, and demonstrated to myself
that the sharpest lens in my house is this borrowed lens. So thanks for
getting me to understand the difference in low frequency sharpness (which
the ZU actually has even to the corners if the corners are indeed what
I've focused on) and higher frequency MTF performance, which is why the EF
85 does so well with the grass.
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