[PRODIG] D100 how big has anyone gone and what is fringing please

[matthew ward]

On Saturday, February 15, 2003, at 11:18 AM, ian reynolds wrote:

The images will be produced on postcard and a3 poster. There will also
be one produced on a huge background (bigger than people) estimated 2
metres high 3metres wide.(so viewing distance will be relevant.)

If I take the dpi down to 140dpi I get a 195.94 by 130.28 cm image. It
looks fine on screen at this size.

You need to find out what the printer needs, as they will simply interpolate to the size required.
Sometimes well, sometimes not.

My question is could I go this big if required bearing in mind the
viewing distance. What are your views please and yes I know it's a slr
style camera, I cant go to the big boy backs yet and the budget doesn't
warrant it.

Any one tried this with a d100 yet at all ??? (It would probably be fine
with a 1ds)

I went to A2 @ 300 dpi with no probs (soft artwork so might not be the worlds sharpest)
Get the best lens you can find. Don't use a zoom and try not to use a wide angle. Cheer yourself up and look at how crap a lot of these large images really are.
Get a 10x8 image printed from the important bit of the enlarged image and see if it is good enough for your client.

Fringing

I also shot some signs last week and got a blue line next to a sign. The
light was coming from behind, is that called fringing ????.

Yup. Some lenses are designed to focus all wavelengths of light onto the same plane (Apocromatic or APO lenses). Some are designed to be wideangle,(overlarge image circle),retrofocus,ultrafast,zooms,cheap,telefocus,small etc etc. You cannot have everything from one piece of glass.
AFAIK most 35mm lenses are not apo, not a great problem normally with a nice bit of mushy film grain to break things up, Big problem with digital.

Panorama tools (as Shangra says) will sort you out. (Powerful and free, what more do you want?) Only 8 bit though. It is your lens (probably). Shoot with the lens against a test target (or a newspaper) spent happy happy hours sorting out the abberations in your lens then apply it to all subsequent images. Read what Brian caldwell has to say.

Hope it helps.

Matthew Ward

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