I'm sorry, I may have slandered the wrong group of idiots, the thread
that gave me a headache was on dpReview, the Pentax Fora thread was
slightly less, err, horrible...
On 10/23/2016 8:06 AM, P.J. Alling wrote:
I know nothing about the 1:1 crop mode, so I decided to do a little
research...
After reading the first few posts on a Pentax Fora thread, I wanted to
yell at my computer screen: "IT'S CALLED AN IMAGE CIRCLE!"; idiots.
Like reading arguments by theologians about how many angels can dance
on the head of a pin, or theoretical physicists, about how many
possible sub atomic particles there are beyond the standard model.
Ultimately headache inducing.
Since I have no information let /me/ speculate wildly, or reason
rationally, whichever.
I assume you're using a full frame lens on the K-1. So I don't see
any particular reason to use crop mode on the camera. As you said the
files don't seem to be any smaller.
The 1:1 crop mode is designed to allow more sensor surface use with
the APS-C image circle, so once again, since I don't really know
anything, I'll assume that the firmware simply throws away anything
outside the 24mmx24mm square, much as it does the information outside
the APS-C crop, so it's not recoverable.
In fact given the performance improvements in APS-C mode, it is
probable that the camera really is only reading the center crop
portion. I have no actual data on the 1:1 mode but if there are
similar though not as great performance improvements then I expect the
same is true in this mode as in APS-C.
One or maybe two more assumption(s), the encoding is less efficient
for 1:1 crop mode because the job to get it included in the firmware
update was rushed, and the efficiency will be improved on the next
release. Either that, or since it's storing ~24mp worth of data, the
files are all on the small size for K-1 files and pretty much in the
normal range for biggish K-3 files, but you just didn't notice.
So there you go, in crop mode the data isn't recoverable because it
isn't there, and unless you're using an APS-C lens there's no real
advantage to using 1:1 crop mode*.
*I pulled all of this out of my ass, and standard disclaimers apply.
On 10/23/2016 2:37 AM, Larry Colen wrote:
When I was photographing a seminar at the dojo today, I tried
photographing in square crop mode.
On the bright side, it worked great for the photos that I was taking.
two people practicing Aikido can nearly fill a square composition,
where they leave a lot of the 3:2 frame empty.
On the down side, the raw files are no smaller. I also don't see any
easy way of recovering (in lightroom) the image that was cropped off
to either side, so the frames where someone's limb left the frame, I
would have been better off shooting uncropped.
If the square crop gave us 24 MP square images (rather than 36 3:2)
it would be awesome, it would save space on the card, and more
importantly in the buffer. As it is, all it saves me is selecting a
bunch of frames and cropping them square.
--
I don't want to achieve immortality through my work; I want to achieve
immortality through not dying.
-- Woody Allen
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