Details, DP2M and Pixel-Peeping ...

Started 2 months ago | Discussions thread
D Cox Forum Pro • Posts: 24,030
Re: Details, DP2M and Pixel-Peeping ...
1

xpatUSA wrote:

We talk about "detail" a lot in this Forum, perhaps because the Foveon is quite good at recording said detail.

I often wonder what "detail" is. In my own mind, detail is objects no smaller than one pixel at the sensor. My DP2M has a 5um pixel spacing and a 30mm focal length lens but how does that translate to objects in the scene? By which I mean that a leaf shot at minimum focusing distance is hardly a "detail" - but that same leaf shot from a mile away is beyond even the resolution of the Mighty Merrill.

Easy enough really, if we now talk about angles. The DP2M pixel at 30mm subtends an angle of about 0.6 minutes of arc, i.e. 0.1666 milli-radians (mrad). On the other side of the lens, i.e. in the scene, such a detail is easily calculated. An object 1 meter away will be 0.167mm large, 100 meters away the same 1-pixel detail will be 16.67mm large. Piece of doddle.

This kind of calculation is useful when you have to photograph a large painting.

Although I have a DP2M, shooting anything with such detail is quite a challenge for me such that I find it necessary to go beyond 100% zoom in post to make sure my shots are at least half-decent. Of course, others here are so good at capturing "detail" that they need no such assurance and they cannot understand why I pixel-peep even at 100%.

So, in defense of pixel-peeping, I took a virtual shot of small piece of virtual mesh with exactly one-pixel dimensions with a virtual DP2M. Here is that virtual "shot":

So, how "good" is that mesh detail? Anybody?

No peeping now, y'hear? - but feel free to use a real magnifying glass on your monitor ...

More to come later ...

Good stuff. More please.

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