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08-27-2012, 08:32 PM   #841
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QuoteOriginally posted by gtl Quote
I thought the crop mode on the D800 is 16mp...
Not sure, but based on the 1.5 crop factor, I'm guessing the crop mode would be 24 MP.
I rather have 16 MP in crop mode so I can have the same resolution and performance of the K-5.

Then again, I could be doing the math all wrong...

08-27-2012, 08:41 PM   #842
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You need to divide by the crop factor twice - 1.5 is a linear factor and the MP are based on area.
08-27-2012, 08:45 PM   #843
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QuoteOriginally posted by 7samurai Quote
Not sure, but based on the 1.5 crop factor, I'm guessing the crop mode would be 24 MP. I rather have 16 MP in crop mode so I can have the same resolution and performance of the K-5. Then again, I could be doing the math all wrong...
I made the same mistake. Look back at post 194 to see how Cannikin clearly shows the math.
08-27-2012, 08:45 PM   #844
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QuoteOriginally posted by 7samurai Quote
Not sure, but based on the 1.5 crop factor, I'm guessing the crop mode would be 24 MP.
I rather have 16 MP in crop mode so I can have the same resolution and performance of the K-5.

Then again, I could be doing the math all wrong...
you are, the crop factor of 1.5 applies to the sensors linear dimensions (sides, diagonal), the difference in area is 1.5^2=2.25, therefore: 36/1.5^2=16

edit: ninja'd

08-27-2012, 09:34 PM   #845
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QuoteOriginally posted by ElJamoquio Quote
You need to divide by the crop factor twice - 1.5 is a linear factor and the MP are based on area.
thank you for the clarification. in that case, i need 36 MP......that would require alot more cpu on my side...
08-27-2012, 09:35 PM   #846
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no one said there was math involved...
08-27-2012, 09:42 PM   #847
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I am dying for a FF Pentax body but my budget wouldn't be able to handle it. Everything about it would be more expensive. Someday.... Someday..
08-27-2012, 10:02 PM   #848
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Now that I know the math, thank you for the education. Wouldn't a 24 MP full frame have the potential for even better high iso images?
I'm assuming you will be able to get larger pixel wells on a 24 MP full frame sensor vs the 36 MP sensor.

08-27-2012, 11:05 PM   #849
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D800 Image area Option Size (pixels)

According to my D800E manual the crop modes are as follows:

(FX format) FX (3624) 1.0
L 7,360 4,912 = 36.15MP
M 5,520 3,680
S 3,680 2,456

1.2 (3020) 1.2
L 6,144 4,080 = 25MP
M 4,608 3,056
S 3,072 2,040

(DX format) DX (2416) 1.5
L 4,800 3,200 = 15.36MP
M 3,600 2,400
S 2,400 1,600

5 : 4 (3024)
L 6,144 4,912 = 30.1MP
M 4,608 3,680
S 3,072 2,456
08-28-2012, 12:51 AM   #850
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Still no 1:1 crop mode. What a bunch of idiots. Can't understand why, that would make happy a bunch of 6x6 guys.
08-28-2012, 01:01 AM   #851
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QuoteOriginally posted by Zygonyx Quote
For this statement, yes, you sound a bit crazy : the difference btw 645D sensor and 35mm is roughly the same as btw 35mm and APS-C regarding size.
One of the actual and measurable consequence besides bokeh and global light capability, is that you get at best in file resolution at lower than f/8 with D800, compared to lower than f/13 with 645D.
This said, the commercial birth-day of a CMOS 33x44mm sensor has not happened, yet.
The crop factor of APS-C is 1.53 while the 645D crop is 0.79. So, the difference with APS-C is exactly twice as large (four times as large in terms of #pixels) compared to 645D. It would be different for full medium format but the 645D is a crop camera too.

Moreover, the 645D gathers 2/3 stop more light than full frame. But this is more than offset by a lack of fast medium format lenses. And optically, only the new 25mm lens (20mm equivalent) for the 645D creates an image quality which challenges full frame. But its price is insane and then there are good Zeiss 21 and 25mm options for full frame.

The D800E does indeed challenge the 645D. Very much so. Just look into web sites which discuss HB, P1, 645D, S2 and now the D800E. Samples show no advantage for the cropped MF cameras.

IMHO, the 645D would have made sense as combo of affordable body ($7000) plus affordable legacy glass bringing a full set below $10k. But the new 25mm is too expensive for this to happen and the body alone is still more expensive than a D800E plus glass (and deprecates faster).

The 645D has a future though simply because it allows photographers to differentiate from the crowd.
08-28-2012, 01:09 AM   #852
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QuoteOriginally posted by bossa Quote
According to my D800E manual the crop modes are as follows:

(FX format) FX (3624) 1.0
1.2 (3020) 1.2
(DX format) DX (2416) 1.5
5 : 4 (3024)
and then there is a 24MP 16:9 crop mode, activated by video LV.

QuoteOriginally posted by thibs Quote
Still no 1:1 crop mode. What a bunch of idiots. Can't understand why, that would make happy a bunch of 6x6 guys.
Except for modes supported by LV only, each crop mode is supported by shading out the cropped regions in the optical viewfinder. This doesn't come for free and there you have your reason. I tell you because you said "Can't understand why"
08-28-2012, 01:24 AM   #853
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QuoteOriginally posted by falconeye Quote
and then there is a 24MP 16:9 crop mode, activated by video LV.


Except for modes supported by LV only, each crop mode is supported by shading out the cropped regions in the optical viewfinder. This doesn't come for free and there you have your reason. I tell you because you said "Can't understand why"
Thank you it explains why you can't get thousands of crop modes, but a 5:4 crop instead of a 1:1 ?
08-28-2012, 01:39 AM   #854
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It takes 2 seconds to apply a 1:1 crop in PP , no big deal.
08-28-2012, 01:41 AM   #855
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I think a focus screen that has extra lines for the crop modes would be far cheaper, easier to implement and less prone to malfunctions then such a luxurious crop mode as the D800.

Anyway, personally I wouldn't mind a FF Pentax just to have an extra frame or DA-crop-corners on the focus screen.
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