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Forum: Pentax K-r 03-07-2012, 11:32 AM  
Sticky: K-r vs K-x
Posted By satep
Replies: 66
Views: 84,551
I too currently have Kx and wondering if it is worth it to upgrade to Kr
(guessing I will probably lose somewhere around $200 to trade up.)

For those who have used both I specifically was interested whether
the slightly larger LCD and more resolution helps in viewing a more
accurate image (if it is out of focus.)

I shot mostly still pictures but occasionally I experimented with
shooting video with shallow DOF so it needed precise manual
focusing. With the Kx, with my eyes at its current condition,
I found it a bit hard to find the good focus image.
It would be great if the higher resolution LCD (and slightly
larger size) makes a big difference.

Let me know if anybody has experience with that (or if you
use LiveVideo with manual focusing.) All the other better
features of the Kr (such auto focus indiicator, etc.) is not
so important for me.

Thanks.
Forum: Troubleshooting and Beginner Help 11-29-2011, 11:50 AM  
The first jpg file in the folder is corrupted
Posted By satep
Replies: 6
Views: 1,607
Thank you for both of your suggestions above. They are helpful.

Yes I only used the demo version of the recovery software so
all I can see is a smaller version of the original image (so the
size of the image is not the same as the original.)
The smaller version of the image looks correct.
So far I have not lost important images and the cost of the
software is almost twice the cost of the SD card so I have
not purchased the software.

This morning (a new day so it would have created a new folder),
I took 2 photos with the lens cap on in Manual mode
so the image should be all black.
Sure enough the first photo (file) has problem but
the second photo is fine.

On the SD card:
For the bad photo the size is 263,033 bytes (size on disk is 294,912 bytes)
For the good photo the size is 263,415 bytes (size on disk is 294,912 bytes)

After I copied them to HDD:
For the bad photo the size is 263,066 bytes (size on disk is 266,240 bytes)
For the good photo the size is 263,415 bytes (size on disk is 266,240 bytes)

Interesting to note that for the good file the size is the same on the SD card
and the one copied to HDD.

Comparing the bad and the good file, I can see that the bad file at least
have the first 4 bytes filled with unknown values. However even after
I removed the first 4 bytes on the bad file, IrfanView still cannot display
the file. I observed that after I removed the first 4 bytes, the first 200 bytes
or so of the bad and good files look exactly the same.

I also tested the SD card on a laptop by creating a new folder inside the DCIM
folder and copying a jpg file into that new folder. The jpg file copied there has no
problem even though it is the first file on that folder (which normally will be a
problem if created by the Kx itself.)

I also run the H2testw and it did not report any issues.

Do my findings point to a problem created by the Kx itself?
Forum: Troubleshooting and Beginner Help 11-28-2011, 03:04 PM  
The first jpg file in the folder is corrupted
Posted By satep
Replies: 6
Views: 1,607
Thanks for your suggestions.

I did try #1 and #2 (with several photo viewers) with the same results: the first jpg file is
said to be corrupted and the rest of jpg files in the folder are fine.

I think I have tried #3 with the same result also (I formatted the SD card using
the camera itself.)
Forum: Troubleshooting and Beginner Help 11-28-2011, 01:19 PM  
The first jpg file in the folder is corrupted
Posted By satep
Replies: 6
Views: 1,607
I recently bought a 32GB Patriot SD Card LX Series Class 10 for my Pentax Kx.

After using it for several months I have noticed something strange.
It looks like whenever the Pentax created a new folder (mine set automatically
to create a new folder for each day) the first jpg file in that folder is
corrupted (looks like there are extraneous/errand data in the header.)
The rest of the files in the folder are OK (meaning I can open all of them
in any normal JPEG viewer.)

When I open the image using the JPEG Recovery Pro 5 Software, I can see
the full image correctly without any issues at all.
I have not seen this problem with my other SD cards (not a Patriot brand
and less than 32GB capacity.)

I was wondering if anybody has had this issue also.
Is this the problem with the SD card itself (or the brand), the camera,
or the size of the SD card?
Is there a way I can edit the header myself to fix the problem (I tried to
match the header with the good ones but I must have missed something
since the file is still not readable in normal JPEG viewer.)

Thanks.
Forum: Pentax Camera and Field Accessories 06-10-2011, 04:53 PM  
Third Party GPS units
Posted By satep
Replies: 18
Views: 5,181
I have been using Qstarz BT-Q1000XT for several trips already and worked great.
It works with any digital camera and the unit has a long battery life (40 hours between
charge) and since it is a location logger, you can easily get a path log also.

The GPS locations are port-trip added to your images by matching the
date/time of your image with that of the GPS log (with the software provided.)
I usually carried the unit on my belt.
Forum: Pentax SLR Lens Discussion 06-05-2011, 12:47 PM  
Question on possible malfunction on my Sigma 17-70mm f2.8-4 lens
Posted By satep
Replies: 3
Views: 1,408
Hi,

I am a beginner and last year I purchased Sigma 17-70mm f2.8-4 lens
for my Pentax Kx.
Recently, I noticed something that I don't remember if I experienced it
before (last time I used the lens was about 4 months ago.)

The issue is that when I pressed the shutter button (either halfway or
all the way) I noticed that the image/view I saw through the viewfinder
was moving quickly either sideways and/or up and down (judder.)
I also heard some noise from inside the lens.
It does not happen all the time.
The same thing also happening if I just moved the zoom ring.
I tried turning off the OS on the lens and the camera
but the same thing still happened.

It did not behave that way when I used the kit lens.
I have not tried it yet if it behaves the same way in Live Mode.

Is there something wrong with the lens?
As far as I can see it has not affect the picture quality
(although I have not tried it with really slow shutter speed.)
Any additional test I can perform?

Thanks.
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