Forgot Password
Pentax Camera Forums Home
 
Log in or register to remove ads.

Showing results 1 to 4 of 4 Search:
Forum: Pentax K-1 & K-1 II 05-09-2018, 01:55 PM  
K-1 MK2 - Unhappy with results at moderate ISO settings
Posted By gaweidert
Replies: 561
Views: 45,896
Yeah. I have taken mine to a local wildlife refuge and on a few photo safaris around my massive 1/4 acre estate to play with the camera a bit. I have to say, that all in all, I am happy with my K1-II like I am happy with my K1. I am not going to convert my K1 because I would rather spend the money going to Yellowstone next week. The upgrade program will be over by the time I can save up the money. No big deal. Both cameras are very good at what they do. I am pretty impressed with hand held pixel shift. FWIW, after decades of using film. I still have a problem letting ISO creep up over 400.

As to all this high and ultra high ISO technobabble, we seem to have forgotten that ISO settings in these ranges are only to be used for photographing UFO's, Bigfoot and Area 51. Since I have never seen an image of any of these things on this site I figured that Pentaxians are just not interested in them. :D
Forum: Pentax K-1 & K-1 II 04-27-2018, 04:45 AM  
K-1 MK2 - Unhappy with results at moderate ISO settings
Posted By gaweidert
Replies: 561
Views: 45,896
I see it too. If you notice, the lines in the cyan are at a different angle. In half tone printing, different colors are printed at different screen angles, You may be seeing the screen angles that the colors were printed at. Since screen angle offsets are in 15 degree increments applying a protractor to the image may prove this. As noise increase the ISO increases, the lines are literally becoming lost in the noise. It is called banding and for 17 years it was the bane of my existence. Always the worst service calls.


Below is just one of many screen angle set possibilities.


And a Grande Bienvenido a bordo to majareta too. Thank you for the link.
Forum: Pentax K-1 & K-1 II 04-20-2018, 05:24 AM  
K-1 MK2 - Unhappy with results at moderate ISO settings
Posted By gaweidert
Replies: 561
Views: 45,896
Traditionally, a chip like the accelerator chip in the K1-II is to help number crunching. The idea goes back to 1980 when Intel introduced the 8987 co-processor. It worked on motherboards with the 8086 CPU. It's purpose was to speed up computation of floating point decimal arithmetic. If the accelerator is being used in the same way, then improvements due to it cannot be duplicated by firmware on the K1. For some functions it may simply be calculating the result to more decimal points for greater precision. The stand alone processor on the K1 could do this, but it would take longer to reach the same level of precision therefore the calculation is truncated in the interest of speed.

For instance, shake reduction calculations have to happen pretty quick. The accelerator chip provides this speed. Shutter shock on my K1-II is not as bad as it is on my K1 and SR seems to deal with it nicely. Autofocus calculations carried out faster with a more precision would be noticed too. Like it or not the two models will need different firmware and operational and imaging improvements due to having an accelerator chip on the K1-II cannot simply be corrected by firmware on the K1.

As to the original post, quite simply, more data is needed. I tested my K1-II at ISO 3200 with positive results and I found that hand held pixel shift works really well at that ISO too. The camera is merely a tool and no single tool will work well in all situations. So the human part of the equation is to figure out how to make the tools we have get the results we want in the situations we find ourselves in. Avoiding, or working around, the shutter shock "sweet spot" on the K1 is an example of this.
Forum: Pentax K-1 & K-1 II 04-16-2018, 06:46 AM  
K-1 MK2 - Unhappy with results at moderate ISO settings
Posted By gaweidert
Replies: 561
Views: 45,896
A few years ago after the original K1 came out a poster here saw that same issue (also at ISO 800) and innocently posted a question about it seeking help. One would have thought that he had killed the sacred cow. Some of the replies incredibly harsh to say the least. Luckily the moderator jumped in quick and removed them with a proper warning. I chimed in that I too had experienced the same thing on my K1. I even posted a few images from my camera showing the same thing. I never did figure out if it was the camera, a setting or something I did. It may even involve the now documanted shutter shake issue.

It would be interesting to know how the accelerator chip handles the issue of noise when the image also suffers from shutter shock which, of course, introduces it's own set of artifacts. My K1-II does have the shutter shock problem but not as bad as on my K1 and preliminary testing has shown that it is nicely controlled by the Shake Reduction feature.
Search took 0.00 seconds | Showing results 1 to 4 of 4

 
Forum Jump


All times are GMT -7. The time now is 04:05 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top