Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
10-19-2009, 08:55 PM   #1
Veteran Member
schmik's Avatar

Join Date: May 2008
Location: Sydney Aus
Photos: Gallery
Posts: 527
Is K20d viewfinder larger than K7?

Is this site correct?
Digital SLR Viewfinders: Size, Magnification, Coverage, Crop

Mike

10-19-2009, 08:57 PM   #2
Senior Member




Join Date: Oct 2008
Location: Vaughan, Ontario
Photos: Gallery
Posts: 269
yeah can someone explain 'effective size'.
10-19-2009, 09:07 PM   #3
Veteran Member




Join Date: Dec 2007
Posts: 923
The K-7 has a 100% viewfinder and slightly less magnification. 0.95 vs. 0.92 x.
If you consider the Visual angle - the angle a viewed object subtends at the eye - yes it would be marginally less on the K-7 for the same object, at the same distance viewed through the same lens.
10-19-2009, 11:38 PM   #4
Veteran Member




Join Date: Jul 2008
Location: Var, South of France
Photos: Albums
Posts: 1,071
I had briefly both the k20 and the k7, and I made the simple test to put both at the eyes (one left, one right), with the same lens on both (FA 50)...

Well, in the end, the K7 has a slightly larger viewfinder, but it's barely noticeable (I really had to "superpose" them to see the difference).

10-20-2009, 04:07 AM   #5
Senior Member
Sew-Classic's Avatar

Join Date: Jun 2009
Location: Ohio, USA
Photos: Gallery
Posts: 238
Somewhat related:

The veiw finder eye piece on the K20D justs out a bit more from the back of the camera than the K-7. IMHO, the eye peice for the K-7 is too close to the body, and I get shmook (yes that is the official term) from my face on the lcd. Soo, I put the Pentax magnifier loop on the K-7 . My eyes are older than they used to be, so this serves a dual purpose.
10-20-2009, 05:37 AM   #6
Veteran Member
falconeye's Avatar

Join Date: Jan 2008
Location: Munich, Alps, Germany
Photos: Gallery
Posts: 6,863
Site is wrong

QuoteOriginally posted by schmik Quote
No, they are too dumb to compute

They compute effective size as follows (they probably don't tell you this, or do they?):

Size_eff = SQRT(coverage) * magnification / cropfactor

There are three errors I am spotting with their table, sorted by increasing severity:
  1. cropfactor is 1.53, not 1.5 (I mean, they quote 3 digit results ...)
  2. The K20D figure contains a computation error
  3. Coverage can be quoted by area or by linear size. Vendors do both. They arbitarily assume it is by area.
Computing with the (wrong) cropfactor of 1.5 and an area coverage, the figures are:

K-7: 0.613
K20D: 0.617 (NOT 0.633) and both become equal. With a linear coverage, K20D would be less.

Computing with 1.53, the figures read:
K-7: 0.601
K20D: 0.605

BTW, the Pentax MX is 0.945 ...
10-20-2009, 01:16 PM   #7
Veteran Member
schmik's Avatar

Join Date: May 2008
Location: Sydney Aus
Photos: Gallery
Posts: 527
Original Poster
Thanks Faulk. I didn't try to replicat theire maths. I simply looked at the area of the sensor (the same for both cams, the coverage and the magnification. It was very close between the two and the k20d was infact just a tiny bit larger. This surprised me. I was also more surprised by the numbers on that page.

BTW, I use the magnifier on the eye piece of my k7.... and every time i pick up my ME i shed a small tear of joy!

mike
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!
camera, dslr, k20d viewfinder, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Question about the k20d viewfinder kenhreed Troubleshooting and Beginner Help 5 04-03-2014 09:06 PM
K20D Viewfinder Question treetop flyer Troubleshooting and Beginner Help 6 11-02-2010 08:04 PM
K200D viewfinder + Katzeye VS. K20D viewfinder dugrant153 Pentax DSLR Discussion 3 07-24-2009 11:36 AM
VLF Photos: K20D + FA* 300/2.8 @ ISO 800, 1250 (larger files - ~ 1MB) Marc Langille Post Your Photos! 27 08-23-2008 04:46 PM
K200D Viewfinder vs K20D Viewfinder cputeq Pentax DSLR Discussion 7 06-15-2008 11:57 PM



All times are GMT -7. The time now is 10:32 PM. | 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