[mrclark321]

Yes that will work, any uncertanties you can call RRS as they are always great to deal with.

[Zygonyx]

Thanks

[slackercruster]

It never ceases to amuse me how people just look at the resolution count of the camera and assume the output will equal or better that of any other camera that is within 2Mp+/- of it's MP count and completely ignore the size of the sensor. I agree that the D800E will have output that is similar to that of the 645D in terms of resolution, however the overall IQ from the 645D will be higher because the sensor is bigger, the pixels are bigger, and there is much less strain put on the lenses with the sensor used in the current 645D than with the D800E. Nikkor lenses are very good, I own a decent sized collection of them that I work with, but in the area of wide-angles there are going to be some problems with image quality in the corners that are going to be exacerbated but the high resolution of the sensor. Canon photographers have pretty much given up the hope of ever finding a prime, or zoom wider than 20mm* that doesn't have horribly smeared corners.


*truth be told the Nikkor 14-24mm f/2.8G ED lens is absolutely stellar, but in the end it is a rather specialised and expensive lens....and prone to flare.

I'd like to get a 14-24 adapted to the 645D...that would be a helluva combo. 14-24 is the god of wide angles.

Thought about going Nikon D800 and not a 645D But the square footage of the 645D sensor is roughly 68% larger than the D800's sensor. (If I figured it right??) So even if the Nikon was 40mp it would still be 68% behind the 40 mp 645D.

If anyone is mp crazy they should go for the 80 mp Mamaya for $38,000!

40mp is more than fine for me. The only thing I wish Pentax had done was to make the 645D run on 4 AA's. And maybe some built in HDR ability.

[Yamanobori]

The only thing I wish Pentax had done was to make the 645D run on 4 AA's. And maybe some built in HDR ability.

Why do you want AA? The Pentax Lithium-ion battery is so much better. The Pentax does have automatic HDR.

[Yamanobori]

Thought about going Nikon D800 and not a 645D But the square footage of the 645D sensor is roughly 68% larger than the D800's sensor. (If I figured it right??) So even if the Nikon was 40mp it would still be 68% behind the 40 mp 645D.

You really should think of maximum MTF. The lower the frequency, the better the contrast. The maximum resolution of the 645D is about 82 lines per mm for the 645D and 100 lines per mm for he D800 at the image plane. The 645D just doesn't work as hard, although 100 lines per mm is not really that hard. Resolving power is a linear measurement--area is not really useful. An 80MP back only has about a 40% increase in resolution compared with a 40MP camera.

[slackercruster]

Why do you want AA? The Pentax Lithium-ion battery is so much better. The Pentax does have automatic HDR.

Am not against Lithium-ion . Just make the cam run on both types.

[slackercruster]

You really should think of maximum MTF. The lower the frequency, the better the contrast. The maximum resolution of the 645D is about 82 lines per mm for the 645D and 100 lines per mm for he D800 at the image plane. The 645D just doesn't work as hard, although 100 lines per mm is not really that hard. Resolving power is a linear measurement--area is not really useful. An 80MP back only has about a 40% increase in resolution compared with a 40MP camera.

So, is the D800 sharper but the image has to be blown up more than the 645D and the D800 loses some lustre?

[Yamanobori]

So, is the D800 sharper but the image has to be blown up more than the 645D and the D800 loses some lustre?

Actually, no. The resolving power at the image plane has nothing to do with sharpness. In fact, the opposite conclusion can be drawn as the lower frequency 645D should have more contrast for any given amount of detail.

[itshimitis]

Why do you want AA? The Pentax Lithium-ion battery is so much better. The Pentax does have automatic HDR.

Though quite why one would want to have a high standard camera like the 645D and then use it for an automated HDR defeats me. I believe it only works on Jpegs too. I don't really see the point of running on AA batteries, it's not as if the L190 is that difficult to get hold of in any case.

[veato]

I guess the benefit of AA batteries is if you get caught short on power when out and about any old shop will probably sell you some AAs.

[Digitalis]

I guess the benefit of AA batteries is if you get caught short on power when out and about any old shop will probably sell you some AAs.

that feature is better suited to cameras like the KM and other lower tier camera bodies. Just be thankful the batteries for the 645D don't cost as much as the batteries for the Hasselblad H series.

[Yamanobori]

I guess the benefit of AA batteries is if you get caught short on power when out and about any old shop will probably sell you some AAs.

I have shoot under 0C for upto 6 hour on one battery. I carry three batteries. I am not sure when I would be short of power. And if I was, I probably would not be in a place that had a store with batteries.

[Adam]

This thread is showing up as second on google, so I'm going to add this link to our D800E vs 645D comparison for those who are interested:
Nikon D800E vs. Pentax 645D - Introduction - PentaxForums.com

[Ryan Tischer]

I'd like to get a 14-24 adapted to the 645D...that would be a helluva combo. 14-24 is the god of wide angles

Maybe you're already aware of this and only speaking of what's possible 'in a perfect world', but there's no way the 14-24 would work on the 645D because the image circle wouldn't be large enough, so you would have some serious vignetting. Also, I don't know if it would focus at infinity. 14-24 would be rediculasly wide on its widest end on the 33x44 sensor, and in my opinion only useful towards the longer end.