On Sat, Jul 25, 2009 at 06:11:00PM -0400, J.C. O'Connell scripsit:
> I stand by what I said, the *****FURTHER****** you get away from
> normal, the less often you need it. Sure, ultrawides and ultrateles
> have their uses on occasion, but not nearly as often as moderate wides
> and teles. I didn't mean to imply the normal lens is the best or most
> useful, its just the further and further you get away from normal, the
> less often its going be what you need.
I seem to be peculiar with respect to this principle.
If I change to the 2009 directory, which has everything by month and
then day directories in it, I can use:
for x in */*/*dng; do echo `exiftool -FocalLength $x` >> lengths; done
to get a list of all the focal lengths used so far this year. (This
takes awhile.)
sort -u lengths > unique_lengths
gets me the individual focal lengths; there are 25, ranging from 0
(really a telescope) to 800mm. Stuffing that through a quick bit of
perl [1] gives me, after a bit of hand-sorting (500 sorts right after
50, etc.), and some column tweaking:
Total 7645 shots so far in 2009
Focal Length # of shots
14.0 mm 9
31.0 mm 295
35.0 mm 399
50.0 mm 282
55.0 mm 274
62.5 mm 18
70.0 mm 110
77.0 mm 546
77.5 mm 42
87.5 mm 60
97.5 mm 65
100.0 mm 1287
107.5 mm 101
120.0 mm 47
135.0 mm 38
150.0 mm 37
170.0 mm 97
190.0 mm 100
210.0 mm 171
230.0 mm 92
260.0 mm 86
300.0 mm 1259
"0.0 mm" 134 [2]
500.0 mm 596
800.0 mm 1500
[2] Celestron 80mm ED spotting scope; listed focal length 480mm
Whatever I am doing, I'm not following the "further from normal the less
use" rule.
> My post was made in the context of a 600mm lens on digital, while
> maybe useful for birds, its just going to be too long for nearly
> everything else. That's a very specialty focal length.
Oh, I agree, but I am coming to think that pretty much everybody is a
speciality photographer.
[1] Just in case anyone might want it:
#!/usr/bin/perl -w
#
# deliver us from evil
use warnings;
use strict;
use Tie::File;
my $shots = "/home/graydon/photo/K20D/2009/lengths";
my $focal = "/home/graydon/photo/K20D/2009/unique_lengths";
my $leader = "Focal Length : ";
tie my @AllShots, 'Tie::File', $shots or die "Could not open file
$shots\n$!\$?\n";
tie my @lengths, 'Tie::File', $focal or die "Could not open file
$focal\n$!\$?\n";
for my $length (@lengths) {
my $uses = grep { /$length/ } @AllShots;
$length =~ s/$leader//;
print $length,":",$uses,"\n";
};
untie @AllShots;
untie @lengths;
-- Graydon
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