Re: help with manual focus on Rebel XT
- From: All Things Mopar <nunofyour@xxxxxxxx>
- Date: Sun, 19 Feb 2006 21:19:11 -0600
Today Jeremy Nixon commented courteously on the subject at
hand
I sure wish EXIF showed the as-focused distance! My Nikon
5700 didn't, either.
It won't. The mechanics will vary from one brand to
another, but for example, the Nikon "D" lenses, which
report focus distance information to the camera, work in
"zones". They don't report the exact distance, just one of
about a dozen ranges of distances, which is good enough for
the purposes the camera uses the information for.
Interesting. This is the first time I've seen this info.
Thanks. I just wondered for the last several years why EXIF
for everybody's camera was blank for distance focused.
My Canon 17-40 and 24-70 L-glass lenses both have distance
scales like my old Nikon FTN Nikkor lenses did, but in a
few quickie tests, I learned that it was showing 12, maybe
15 feet when the real distance by pacing it off or
measuring with an 18' tape was closer to 25-30 feet.
Those scales can be off, depending on the lens. Some zoom
lenses don't hold focus over their zoom range, so the exact
position can vary with the zoom; some types of lenses can
vary based on the environment, which is why you sometimes
see ones that focus past infinity (or past the infinity
mark on the scale).
My "camera droid" gave me a couple of excellent tips for doing
Tv, Av, and M using eTTL on my 430EX that eliminated more than
99 44/100 of the times I used to think full manual might be
necessary, so I no longer care that my L-glass misses the
distance by almost half, for whatever the reason.
I enjoy learning the theory of things, but after awhile, the
pragmatist in me takes over.
If my brain is all fried on this stuff, please enlighten
me. I am just as interested in an alternate focusing
solution as the OP, albeit on completely different lenses.
Scream and yell at the manufacturers to provide proper
focusing screens for digital SLRs. The lack thereof is the
worst thing about the entire spectrum of digital cameras.
As a presidential candidate once said "it's the economy,
stupid", meaning that "it's the cost, stupid" why low-end or
maybe even high-end DSLRs have less-than-optimal finders. That
was one of the big things I liked about my old Nikon FTN -
replaceable ground glass. I had at least a half-dozen for
various purposes, but kept coming back to the one with a
cross-hatch pattern that was designed for the Nikkor 35mm PC.
My first digital had it, too, but I can live without it.
When I asked about this when I first bought the camera, I was
given the web sites for a couple of firms that can put in a
better "ground glass", but the price and side-effect
disadvantage out-weighed the benefits for me. So, as I
indicated, I just take another shot or two when I notice the
camera "hunting and fetching" trying to get a lock. That gives
me a good clue it will blow it, at least a little.
--
ATM, aka Jerry
.
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