papakatz45 Loc: South Florida-West Palm Beach

Well obviously he does. I am always amazed at people like you. If you don't like the post, don't respond.

blackest Loc: Ireland

its ok, it is an unusual exercise.
the idea is this if you take say a 50mm lens on full frame then on aps-c it has a field of view of 75mm. You could also crop down to 4/9 ths of the full frame image and this will also look a 75mm field of view. So now both cameras have photos with a 75mm field of view.

So they have the same reach and the guy with the full frame can reframe quite freely (think of the rule of thirds grid) the crop is effectively 4 of the 9 rectangles) and have the same field of view as the guy with the aps-c camera.

But the guy with the aps-c camera says i've got more detail than you have i've got 24Mpix and you have just under 16 so I can make a bigger print than you can.

To be fair thats true to some extent, if you ignore viewing distance and put your nose to the print 24 Mpix can go to a larger print size than 16 Mpix.

You don't have to crop to aps-c size you can crop as you want so how about a crop of 6000 x 4000 pixels (or 24Mpix) Now the pixel count is the same but of course there is a wider angle of view on the full frame crop. So its going to take a slightly longer lens which is where the 1.23 crop factor comes in. if the guy with the Apc-c puts a 200mm lens on then the full frame can use a 250mm to get that 300mm look and have the same detail as the aps-c. The full frame can also move the crop and may well have less noise and because of the use of more of the sensor area less magnification is needed.

Different full camera models will have different focal lengths with the D750 the whole of the frame would be used...

Its pretty much based on a false premise that 24 Mpix is needed to be able to make a good print. My canon 1d mark II would disagree as would my 10.2 Mpix k200d. Having resolution that you have to pixel peek to see isn't necessary.

PHRubin Loc: Nashville TN USA

Technically - Inadequate information! It is not the number of sensor pixels that matters, it is the sensor size in mm². The crop factor is the square root of the full frame sensor size divided by the crop sensor size.

Note that all Nikon crop sensors have the same crop factor, regardless of pixel count, 1.5!

BebuLamar

I think you misunderstand his question.

BebuLamar

I get your point. And you can see few FF cameras when use the same lens as on a cropped camera can deliver the same number of pixels that the cropped camera can. That is the reason for those claimed that the crop sensor has more reach but of course that is not always true. If you were to compare your K1 to the D300 then your has more pixels when cropped to show the same view.
My Nikon Df full frame uncropped (which is still in the current line up) has fewer MP than any cameras that are currently in the Nikon, Canon DSLR's line up.

SalvageDiver Loc: Huntington Beach CA

250mm on the K1 when cropped to 6000x4000 px is equivalent to using a 200mm on the D7200.

(Download)

carl hervol Loc: jacksonville florida

how many times is this going to come up its getting very old!!!!

papakatz45 Loc: South Florida-West Palm Beach

Then just ignore it.

BebuLamar

Actually this is the first time I heard in the UHH.

fetzler Loc: North West PA

There are only a few voices of sanity here. CROP FACTOR DOES NOT DEPEND ON THE NUMBER OF PIXELS YOUR CAMERA HAS. CROP FACTOR DEPENDS ON THE SIZE OF A SENSORS. When comparing a Nikon aps-c sensor to a full frame sensor the crop factor is 1.5.

A 35mm lens on an APS-C has the same FOV as 52.5 mm lens on FF camera (50mm is close enough)

BebuLamar

And so you misunderstood the OP question.

blackest Loc: Ireland

Perfect, I love your work.

Extra Credit:

Human vision is said to be able to just resolve 10 lpm line pairs mm (maybe with my readers on) is there a difference in Print size that can reach this limit using 6000 x 4000 from each sensor? is there a difference in sensitivity to diffraction?

BebuLamar

Don't quite understand your question about sensitivity to diffraction.

blackest Loc: Ireland

Now we have carved out a custom sensor with 6000 x 4000 pixels which is bigger than aps-c but smaller than full frame. Hows it compare with the aps-c sized sensor

Having larger pixels and needing less enlargement than the aps-c sensor I would suspect diffraction would be a tad worse in the aps-c.

Being a larger sensor it should have its pixels enlarged less than on the aps-c. I've a feeling that the resolution of both would start to breakdown at the same size.
noise maybe less in the larger sensor size.

I've been experimenting in Lightroom it is possible to do a pixel based crop, so you can have the same reach with a lens as on aps-c

BebuLamar

With same number of pixels generally the larger the better don't you think.