Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-10-2010, 03:02 AM   #1
Inactive Account




Join Date: Apr 2008
Location: Hungary
Posts: 24
645D lost the competition

Same pixel count and same image sensor size as the newly announced Mamiya MF digital. But Mamiya has 16 bit color and penatx only has 14 bit (here are the 645D specification: Pentax 645D specification ). How did pentax lose 2 bits of color if the image sensor is the same which is seems likely it is? Maybe this is how pentax is able to sell the camera for so cheap compared to Mamiya.

03-10-2010, 03:18 AM   #2
Veteran Member
ghelary's Avatar

Join Date: Jul 2008
Location: Paris, France
Photos: Gallery
Posts: 617
Mamiya/Phase One uses Dalsa sensor vs Pentax (and Hasselblad) uses Kodak sensor.

Plus on CCD sensors you get analogue signal that you convert in Digital.

16bits vs 14bits don't worry me much, at the end of the day, the result is what counts.
03-10-2010, 03:49 AM   #3
New Member




Join Date: Mar 2008
Location: Netherlands
Posts: 14
and those 2 bit's don't cost 10.000$ more.. and won't be that much of a diff.. so they did not lose.. not many people will care for those 2 bits more.

Last edited by Vaizard; 03-10-2010 at 03:56 AM.
03-10-2010, 03:52 AM   #4
Veteran Member
kevinschoenmakers's Avatar

Join Date: Mar 2009
Location: Shanghai
Photos: Gallery
Posts: 1,513
quoting a dpreview forum post:

QuoteQuote:
QuoteQuote:
But strangely enough, Pentax is unable to produce 16 bit color with this same image sensor that Mamiya is able to produce. Pentax's version is only 14 bit.
The sensor is only good for about 12-13 bits anyway. 16 vs 14 is a marketing game with choice of A/D chips: 16-bit has two or more garbage bits due to sensor noise.
Pentax 645D announced [Page 1]: News Discussion Forum: Digital Photography Review

03-10-2010, 03:55 AM   #5
Veteran Member
pcarfan's Avatar

Join Date: Sep 2007
Location: Dayton, Ohio
Photos: Gallery | Albums
Posts: 2,960
Pentax unveils 40MP 645D medium format DSLR: Digital Photography Review
03-10-2010, 04:19 AM   #6
Veteran Member




Join Date: Nov 2008
Location: Umeň, Sweden
Posts: 755
QuoteOriginally posted by gubak Quote
Maybe this is how pentax is able to sell the camera for so cheap compared to Mamiya.
By not wasting money on needlessly overdoing meaningless marketing specs with no real world use? I guess, so go Pentax! Good job!
03-10-2010, 04:24 AM   #7
Veteran Member
ghelary's Avatar

Join Date: Jul 2008
Location: Paris, France
Photos: Gallery
Posts: 617
Oh, I forgot to say that printer have at 8bits color depth.

6 bits of margin for color adjustements are plenty enough.
03-10-2010, 04:26 AM   #8
Senior Member
Simian Summit's Avatar

Join Date: Feb 2010
Location: Hamilton
Photos: Gallery | Albums
Posts: 146
In electronic equipment aren't the number of bits supposed to be divisible by 8?

03-10-2010, 04:28 AM   #9
Pentaxian
gazonk's Avatar

Join Date: Feb 2009
Location: Oslo area, Norway
Photos: Gallery | Albums
Posts: 3,512
QuoteOriginally posted by Simian Summit Quote
In electronic equipment aren't the number of bits supposed to be divisible by 8?
No, not even bytes were always octets (see Byte - Wikipedia, the free encyclopedia).
03-10-2010, 04:30 AM   #10
Veteran Member




Join Date: Oct 2008
Location: Zagreb, Croatia
Posts: 370
QuoteOriginally posted by Simian Summit Quote
In electronic equipment aren't the number of bits supposed to be divisible by 8?
nope, you can have arbitrary number of bits - for example, there are a lot of smaller LCD screens (mainly on older mobile phones) capable of showing 13-bit color = 8192 colors.
03-10-2010, 05:05 AM   #11
New Member




Join Date: May 2009
Location: Toronto Area
Posts: 6
14 bit

14 bit is over 4 trillion colors, I don't think that is going to pose a problem if it is getting that full range. I doubt any human eye would be able to distinguish the difference. And, as others have noted, is the additional 2 bits that the Mamiya is getting worth twice the price? Again, I doubt it.

However, Pentax hasn't been terribly active in medium format for a while, so they have some ground to catch up. There's an investment in systems from Mamiya, Phase One, etc. that are not going to be tossed away just because Pentax has a digital version of the 645 now.

As for me, I'd love it, but that's going to be way out of my price range as an amateur unless I get very lucky in the lottery.
03-10-2010, 05:06 AM   #12
Inactive Account




Join Date: Jun 2008
Location: Dakar
Photos: Gallery
Posts: 17
No shake reduction? I am quite sure the competition doesn't have it but it would have been cool.
03-10-2010, 05:18 AM   #13
Pentaxian




Join Date: Apr 2007
Location: Sweden
Posts: 1,940
What, no AA-batteries? Epic fail.
03-10-2010, 05:32 AM   #14
Senior Member
Spag's Avatar

Join Date: Oct 2008
Location: Berlin
Photos: Gallery | Albums
Posts: 121
No lolcat text insert mode? ▄berfail!!
03-10-2010, 05:33 AM   #15
Veteran Member




Join Date: Nov 2008
Location: Umeň, Sweden
Posts: 755
QuoteOriginally posted by spqr Quote
And, as others have noted, is the additional 2 bits that the Mamiya is getting worth twice the price? Again, I doubt it.
And again, even without knowing the actual signal/noise ratio, I can pretty confidently say there is no way this sensor, or the Mamiya's for that matter, delivers 16 bits of actual useful data. The two least significant bits will be filled with useless noise and clutter memory cards with no real gain.

Last edited by Erik; 03-10-2010 at 05:38 AM.
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!
645d, color, image, mamiya, pentax, pentax news, pentax rumors, sensor, specification
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
k-5 competition lurchlarson Pentax DSLR Discussion 14 09-07-2010 11:03 PM
Question competition Milda Makter Site Suggestions and Help 1 11-14-2009 12:14 PM
PP Competition ozlizard Mini-Challenges, Games, and Photo Stories 39 08-24-2009 05:57 AM
PP competition ozlizard Site Suggestions and Help 8 08-13-2009 08:03 AM
The competition... Tom Lusk Post Your Photos! 1 07-26-2007 08:07 AM



All times are GMT -7. The time now is 03:27 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