DX vs FX picture size

[toryw]

I know this has been talked about but this is something that wont stick in my head.

lets just use arbatrary focal length numbers.

A DX lens on a DX Body 10mm (equivalent to 15mm FX (10x1.5)
A FX shot at 10mm is obviously wider.


Now say we use that FX 10mm picture and want the same DX 15mm. Wouldnt the picture in FX 10mm appear closer in the actual Frame then the DX 15mm.

say we shot a flower, seem closer or fill the frame more on FX then the DX Frame.

Thanks

[teaking]

Just a guess here I dont actually know for sure but I would assume that if you cropped the FX to the same size/ration as the DX it would be the same distance away. I think cropped sensors just allow less of the shot to be captured hence why full framed sensors take wider angles shots, and the lens is the kit that effects distance.

Im probably completely wrong haha

[Doug Pardee]

Originally Posted by toryw

Wouldnt the picture in FX 10mm appear closer in the actual Frame then the DX 15mm.

So you're saying you're going to crop the FX+10mm image? That's exactly what the DX sensor does. So obviously the results are going to be the same as using a cropped sensor with the same lens (provided that the crops are identical, of course).

You'll probably have fewer pixels left in the cropped FX photo, though, so you'll have less resolution.

[toryw]

i was refering to the FX and DX as diffrent cameras not same camera just fx or dx mode.

but ultimatly the same size frame

[teaking]

Im guessing you wouldnt have the same size frame as the fX and DX are sensor sizes that Nikon use?

If it is the sensor size then you either have a cropped sensor or a full frame sensor one will have more of the scene in the image but if the full frame was cropped it would be the same as the cropped sensor, as your doing the same thing in different ways if that makes sense at all.

[OsmosisStudios]

Originally Posted by toryw

Now say we use that FX 10mm picture and want the same DX 15mm. Wouldnt the picture in FX 10mm appear closer in the actual Frame then the DX 15mm.

Youve got this backwards: an FX picture at 15mm will be equivalent to a DX picture at 10mm in terms of field of view: distortion and other things considered will be different.

The same thing if you throw a 300mm lens on a FX camera and a 200mm lens on a DX camera. They'll "see" the same image because the DX camera only uses the centre portion of the FX image circle. It's called a "crop factor" because it's the amount of the image circle that is cropped.

[toryw]

Ya ur right about the 15mm and 10mm just mixed them up when i wrote them.
but yeah, it makes sense.
Thanks.