Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-05-2019, 05:42 PM - 1 Like   #31
retired sw engineer
Loyal Site Supporter
reh321's Avatar

Join Date: Nov 2014
Location: South Bend, IN, USA
Photos: Gallery | Albums
Posts: 15,057
QuoteOriginally posted by rawr Quote
The GR III curve is also an interesting one.

A strong 'accelerator' boost kicks in even earlier than the KP. Ricoh seem to like this tech a lot.
So do I.

Last Fall, when photographing animals out my window with my K-30, I was constantly making compromises in order to keep the ISO at or below 800.

Now, with my KP, I just set the shutter speed and aperture to appropriate values using TAv mode, and if ISO 4400 is needed to make it work - I know the KP can handle that.

04-06-2019, 02:48 AM   #32
Pentaxian




Join Date: Apr 2007
Location: Sweden
Posts: 2,102
"Accelerator" is it more than a fancy name for noise reduction? I'm not so sure I like it...and that is why I didn't upgrade.

But then even the K5 had noise reduction kicking in at 1600, and back then it was considered cheating as it improved some measurements.
04-06-2019, 02:58 AM   #33
Site Supporter
Site Supporter




Join Date: Mar 2009
Location: Gladys, Virginia
Photos: Gallery
Posts: 20,838
QuoteOriginally posted by Gimbal Quote
"Accelerator" is it more than a fancy name for noise reduction? I'm not so sure I like it...and that is why I didn't upgrade.

But then even the K5 had noise reduction kicking in at 1600, and back then it was considered cheating as it improved some measurements.
The whole thing is overblown. It probably does affect shadow detail a little bit, but not stuff you would see without quite a bit of post processing. And I do think it makes higher iso shots in reach of people who don't have high level noise reduction software and the skills to use it.

But the K-1 and K3 don't have it, so those are options for people who want "purity of RAW images."
04-06-2019, 06:04 AM   #34
Pentaxian




Join Date: Apr 2007
Location: Sweden
Posts: 2,102
QuoteOriginally posted by Rondec Quote
The whole thing is overblown. It probably does affect shadow detail a little bit, but not stuff you would see without quite a bit of post processing. And I do think it makes higher iso shots in reach of people who don't have high level noise reduction software and the skills to use it.

But the K-1 and K3 don't have it, so those are options for people who want "purity of RAW images."
Yes, but you also have Sony with the star-eater function.
It's an easy way to improve performance, or at least it looks like the performance have increased.
Why not make it an option instead and everybody could be happy?

04-06-2019, 06:25 AM   #35
Loyal Site Supporter
Loyal Site Supporter




Join Date: Mar 2012
Location: Rochester, NY
Photos: Gallery
Posts: 3,714
QuoteOriginally posted by Gimbal Quote
"Accelerator" is it more than a fancy name for noise reduction? I'm not so sure I like it...and that is why I didn't upgrade.

But then even the K5 had noise reduction kicking in at 1600, and back then it was considered cheating as it improved some measurements.
The chip itself accelerates math processing by taking some of the load off of the CPU. What Ricoh chooses to do with it is up to them. Whether we like what Ricoh has done with it is up to us. Another function that one reviewer actually did measure was a slight improvement in autofocus speed. Not much, but it was measurable. While Pentax autofocus speed is not up to Nikon etc speeds, it is, in reality, not that far off either, so every little bit helps.


Personally I like my K1-II just a little bit more than my K1. I do have a bit of regret for not sending my K1 in for the upgrade. My K1-II does not suffer from shutter shock and having that range of shutter speed available is a plus in my book.
04-06-2019, 07:02 AM   #36
retired sw engineer
Loyal Site Supporter
reh321's Avatar

Join Date: Nov 2014
Location: South Bend, IN, USA
Photos: Gallery | Albums
Posts: 15,057
QuoteOriginally posted by Gimbal Quote
"Accelerator" is it more than a fancy name for noise reduction? I'm not so sure I like it...and that is why I didn't upgrade.
It is much more than noise reduction. Improvement in Dynamic Range and Color Depth are significant.

The comparison below comes from Pentax KP First Shots: Going head-to-head against the Nikon D500 at ISO 819,200!
Pentax KP is on the left - Nikon D500 on the right. My own experiments on KP have also shown amazing performance at ISO 25600 or higher.



Last edited by reh321; 04-06-2019 at 07:10 AM.
04-06-2019, 07:04 AM   #37
retired sw engineer
Loyal Site Supporter
reh321's Avatar

Join Date: Nov 2014
Location: South Bend, IN, USA
Photos: Gallery | Albums
Posts: 15,057
QuoteOriginally posted by Gimbal Quote
Yes, but you also have Sony with the star-eater function.
It's an easy way to improve performance, or at least it looks like the performance have increased.
Why not make it an option instead and everybody could be happy?
The Ricoh representative at CP+ said that making it optional "would be hard" - which is usually the polite Japanese way of saying "We can't figure out how to do that right now".
04-06-2019, 07:07 AM   #38
retired sw engineer
Loyal Site Supporter
reh321's Avatar

Join Date: Nov 2014
Location: South Bend, IN, USA
Photos: Gallery | Albums
Posts: 15,057
QuoteOriginally posted by Rondec Quote
The whole thing is overblown. It probably does affect shadow detail a little bit, but not stuff you would see without quite a bit of post processing. And I do think it makes higher iso shots in reach of people who don't have high level noise reduction software and the skills to use it.
I could do it, but after a lifetime sitting at a computer, I would rather spend my discretionary time in the field and let automation do what it can,

04-06-2019, 07:09 AM   #39
retired sw engineer
Loyal Site Supporter
reh321's Avatar

Join Date: Nov 2014
Location: South Bend, IN, USA
Photos: Gallery | Albums
Posts: 15,057
QuoteOriginally posted by gaweidert Quote
The chip itself accelerates math processing by taking some of the load off of the CPU. What Ricoh chooses to do with it is up to them.
It appears to be more than just that. Apparently it has specific tasks built into it and it performs those specific tasks on sensor output before it gets to the processor.
04-06-2019, 07:12 AM   #40
Site Supporter
Site Supporter




Join Date: Mar 2009
Location: Gladys, Virginia
Photos: Gallery
Posts: 20,838
QuoteOriginally posted by Gimbal Quote
Yes, but you also have Sony with the star-eater function.
It's an easy way to improve performance, or at least it looks like the performance have increased.
Why not make it an option instead and everybody could be happy?
I don't think the way it is created it can be optional, although I imagine that Pentax could design a "full frame" accelerator chip and have it start at a little higher iso. But after reading everything I can about it, it just doesn't seem like something you can turn on or off without quite a bit of redesign.
04-06-2019, 09:30 AM   #41
Pentaxian
joergens.mi's Avatar

Join Date: Jan 2012
Posts: 400
In my opinion it is a signal processor, which is in the loop after the sensor before the Main-Processor, there may be some inputs to the signal processor to get information on ISO Settings and things like that - maybe that this are the signals that are send to the sensor, therefore it may be hard to find a way to set it to do nothing.


Hi Reh321, i don't think, that you have a chance to break in. I assume that only little Information is send from the prime IV to the acc-chip and for the rest the acc-chip is participating on the signals send to the sensor. And the sensor signals are passing thru the acc-chip before seen by the Prime IV.
04-06-2019, 11:22 AM   #42
Pentaxian




Join Date: Apr 2007
Location: Sweden
Posts: 2,102
QuoteOriginally posted by Rondec Quote
I don't think the way it is created it can be optional, although I imagine that Pentax could design a "full frame" accelerator chip and have it start at a little higher iso. But after reading everything I can about it, it just doesn't seem like something you can turn on or off without quite a bit of redesign.
We can only speculate, but as I understand it (which might be way wrong) it kicks in on images above iso640, which means it indeed can pass the image through without "working" on it.
The fact that it now can't be turned off is probably a design decision they made to hide the "true" performance and nothing else.
04-06-2019, 12:12 PM   #43
retired sw engineer
Loyal Site Supporter
reh321's Avatar

Join Date: Nov 2014
Location: South Bend, IN, USA
Photos: Gallery | Albums
Posts: 15,057
QuoteOriginally posted by Gimbal Quote
We can only speculate, but as I understand it (which might be way wrong) it kicks in on images above iso640, which means it indeed can pass the image through without "working" on it.
We know that it reduces noise, increases Dynamic Range, and enhances color - we don't know whether it does anything else; we don't know whether it truly is idling in 'pass through' mode below ISO 640 and/or whether these different functionalities are turned on / ramped up one-at-a-time up to ISO 640. We also don't know whether 'not working on data' is a result of a switch the processor throws or whether its programming causes different behaviors at different ISO levels.
QuoteOriginally posted by Gimbal Quote
The fact that it now can't be turned off is probably a design decision they made to hide the "true" performance and nothing else.
'Design Decision' doesn't mean that they could turn it off; I'm not sure what you mean by 'true' performance. Proper design could mean that it works best when data is always flowing through it, that in some kind of 'off' mode it would degrade the image.
04-06-2019, 01:13 PM   #44
Pentaxian




Join Date: Mar 2007
Posts: 1,102
QuoteOriginally posted by Gimbal Quote
We can only speculate, but as I understand it (which might be way wrong) it kicks in on images above iso640, which means it indeed can pass the image through without "working" on it.
The fact that it now can't be turned off is probably a design decision they made to hide the "true" performance and nothing else.
The Accelerator Unit is always on. The benefits of the of the Accelerator Unit begin to be really visible starting above ISO 640 but that does not mean it is turned on and off above and below those values.

Ricoh developed the Accelerator Unit which is a factor for them in not complying with demands for an on/off switch due to pressure from sites like DPR. Especially when there is no need to turn off the Accelerator Unit.
04-07-2019, 02:18 PM   #45
Veteran Member




Join Date: Jan 2009
Location: London
Posts: 559
"It could possibly be a Gate Array or some other specialized hardware - or a Digital Signal Processor.
Back when I worked on digital radios, the "modems" were implemented in DSPs, because they could do that kind of processing so much faster and efficiently."

IF the sensor outputs digital data then this chip cannot do anything which the camera CPU could not do in its software.

It can probably do it faster...
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
acceleration, accelerator, amplifier, camera, chip, curve, dslr, files, gr, graphics, iii, image, iso, k-1, k-3, k70, kp, lot, noise, pentax, photography, rate, ricoh, tech, tv
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
KP vs K-70 - to KP or not to KP, that is the question OldChE Pentax DSLR Discussion 28 11-02-2019 05:29 AM
Currently have a Kx, looking to move up to a KP, K70, or K3-ii. Recommendations? mojoe_24 Pentax KP 10 11-07-2017 10:05 PM
LR update, May 2017 + GPU Acceleration issue. BruceBanner Digital Processing, Software, and Printing 2 07-29-2017 07:35 PM
Noise Reduction Acceleration Unit reh321 Pentax Q 6 06-15-2016 03:52 AM
Sensor difference due to optics in front of chip rechmbrs Pentax K-5 5 12-04-2010 05:56 PM



All times are GMT -7. The time now is 05:01 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