splatbass Loc: Honolulu

I have read many times that a full frame in DX mode is much lower resolution than a DX camera. But I've also read from several pro wildlife photographers that they use crop mode on their full frame. So I decided to give it a try with my D750 in 1.5x crop mode, and my D7000. Interestingly the DX mode on the D750 in DX mode doesn't give you the same size as the DX camera if you compare the same item.

These two 100% crop pics are from the test. The D750 pic was a little smaller, so I upsized it 120% to get it to as close to the same size as I could in Photoshop. I adjusted the exposure a little to make them about the same, but made no other adjustments. The lens (Tamron 70-200mm f2.8 G2) and settings were the same. 1/400 F8 auto ISO (my normal setting for wildlife). I though since that is how I use it and since I am trying to see which would be better for that purpose this would be the best way to do it. The D7000 set the ISO at less than half the D750 had. And one had good color balance and the other bluish.

Without looking at EXIF data, which do you think is which. And which do you think is better?

rcarol

The images are too small to make a determination.

splatbass Loc: Honolulu

They are at 100%.

100% is 100%. Do you want to look at them at 200%? 300%? What would the point be?

I picked an element out of the pics that has sharp lines in order to judge sharpness. And I showed it full sized (100%).

TriX Loc: Raleigh, NC

An interesting test, but the ISO needs to be the same to do an accurate comparison, both bodies need to be on the same or auto WB (are they?) and the originals need to be stored so we can see more detail. If they are both on auto ISO, what accounts for the one stop difference in exposure? Different metering?

splatbass Loc: Honolulu

Auto white balance. I used auto ISO because that is what I use in the field in real life. This is not a (useless in the real world) lab test. This is real world. I don't shoot wildlife in a lab. If I'm in the field and think "should I switch to the D7000 to get more reach" this is an absolutely good test since it is exactly what I would do, just switch the bodies with the exact same settings.

CHG_CANON Loc: the Windy City

If you're going to take the time for a demo, finish the work by storing the originals ... We're going to poke holes either way, but just showing thumbnails isn't doing much of a demonstration.

splatbass Loc: Honolulu

I did. Did they not store? I checked the box. I'll try again.

TriX Loc: Raleigh, NC

Yes, but having different ISOs will change the noise (which affects sharpness). If the metering is the same (same pattern and area metered) and there is no EV, I would expect the exposures to be very close to the same.

splatbass Loc: Honolulu

Ah, but what if the one with the lower ISO has more noise?

TriX Loc: Raleigh, NC

Then that will tell you something important about the sensors (and the effect of shooting the D750 in DX mode as I would expect the D750 to have lower noise in FX mode given the same ISO)

splatbass Loc: Honolulu

Still didn't store the original. What did I do wrong? I checked the box next to "store original".

Unless, since it is already at 100% it is the original like it is.....;)

splatbass Loc: Honolulu

Yes it will.

CHG_CANON Loc: the Windy City

The 'download' link will occur under each image when you properly check the box ....

How big are the files? You can attached a single image at 20MB or bigger, nor two files that combined exceed 20MB.

(Download)

MT Shooter Loc: Montana

First a thumbnail posting is never an effective comparison by any stretch of the imagination.
Second, your 24MP D750 shot in DX mode is about 10MP. Hardly an effective substitute for the D7000's 16.2MP sensor. Also you have VERY different processors in those cameras which also affects the Jpeg output of each.
So I fail to see any validity in your attempted comparison as posted.
Your D7000 will always give you more pixels on target than the cropped D750, but the ISO & WB results will always be much different due to the processor difference.

splatbass Loc: Honolulu

Since they are already at 100% I don't think it will store the original since it is already there.