view finder of P645N larger than P67II??

LFLee · 10-17-2014, 11:21 AM

I got a P645N... and looking through the view finder I am surprise to find out that the 645N viewfinder window area appear to be larger than my P67II?

Is this true of just I am missing something?

Swift1 · 10-17-2014, 01:08 PM

Originally posted by LFLee

I got a P645N... and looking through the view finder I am surprise to find out that the 645N viewfinder window area appear to be larger than my P67II?

Is this true of just I am missing something?

Viewfinder size/magnification is a very complicated and somewhat convoluted topic.
The 645nII does have a .76x finder with 92% coverage, while the 67II prism is .70x, with 90% coverage. So it is smaller magnification wise, but with the larger frame size, you'd think it should still be bigger.
The lens on the camera also makes a difference AFAIK.
The 645 viewfinder often seems bigger and brighter than the numbers would suggest.

LFLee · 10-17-2014, 01:30 PM

Originally posted by Swift1

Viewfinder size/magnification is a very complicated and somewhat convoluted topic.
The 645nII does have a .76x finder with 92% coverage, while the 67II prism is .70x, with 90% coverage. So it is smaller magnification wise, but with the larger frame size, you'd think it should still be bigger.
The lens on the camera also makes a difference AFAIK.
The 645 viewfinder often seems bigger and brighter than the numbers would suggest.

so in "actual size" which one is bigger?

adpo · 10-17-2014, 03:28 PM

In theory, it should be the 67II, but I unfortunately don't have both cameras on me to compare

desertscape · 10-18-2014, 10:12 AM

The two system have very different finders. The 67II uses a roof pentaprism, while the 645 uses a trapezoid prism with a Keplarian finder. The trapezoid prism was used to save weight.

10-17-2014, 11:21 AM	#1
LFLee Pentaxian Join Date: Aug 2009 Location: Western MA Photos: Gallery \| Albums Posts: 2,258	view finder of P645N larger than P67II?? I got a P645N... and looking through the view finder I am surprise to find out that the 645N viewfinder window area appear to be larger than my P67II? Is this true of just I am missing something?

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10-17-2014, 01:08 PM	#2
Swift1 Pentaxian Join Date: Sep 2009 Location: Oregon Photos: Gallery \| Albums Posts: 3,921	Originally posted by LFLee I got a P645N... and looking through the view finder I am surprise to find out that the 645N viewfinder window area appear to be larger than my P67II? Is this true of just I am missing something? Viewfinder size/magnification is a very complicated and somewhat convoluted topic. The 645nII does have a .76x finder with 92% coverage, while the 67II prism is .70x, with 90% coverage. So it is smaller magnification wise, but with the larger frame size, you'd think it should still be bigger. The lens on the camera also makes a difference AFAIK. The 645 viewfinder often seems bigger and brighter than the numbers would suggest.

10-17-2014, 01:30 PM	#3
LFLee Pentaxian Join Date: Aug 2009 Location: Western MA Photos: Gallery \| Albums Posts: 2,258 Original Poster	Originally posted by Swift1 Viewfinder size/magnification is a very complicated and somewhat convoluted topic. The 645nII does have a .76x finder with 92% coverage, while the 67II prism is .70x, with 90% coverage. So it is smaller magnification wise, but with the larger frame size, you'd think it should still be bigger. The lens on the camera also makes a difference AFAIK. The 645 viewfinder often seems bigger and brighter than the numbers would suggest. so in "actual size" which one is bigger?

10-17-2014, 03:28 PM	#4
adpo Veteran Member Join Date: Apr 2011 Location: San Diego Photos: Gallery Posts: 883	In theory, it should be the 67II, but I unfortunately don't have both cameras on me to compare

10-18-2014, 10:12 AM	#5
desertscape Pentaxian Join Date: Feb 2009 Location: Arizona Posts: 893	The two system have very different finders. The 67II uses a roof pentaprism, while the 645 uses a trapezoid prism with a Keplarian finder. The trapezoid prism was used to save weight.