General rule of thumb is that for any handheld print for close scrutiny (eg: nose to paper)
the ppi requirement is 300ppi -
and the largest handheld print is normally taken as 10x8 -
anything larger than that the viewing distance increases -
such that generally if the image can produce a 10x8 print that stands up to critical close scrutiny -
ought to be mostly satisfactory at larger enlargements (for normal viewing distances)
So from that if one could print full-frame
300x10 by 300x8 pixels = 7,200,000 pixel = 7.2Mp
Most modern dSLRs exceed that by quite a margin -
which would allow for fair amount of cropping.
When digicams first came out the general consensus including many authoritative sources including Popular Photography -
was that 200ppi would give good satisfactory prints (size not given) but most probably 4x6, 5x7 and 10x8 since those were the most popular common sizes
that brings the requirement down to 200x10 by 200x8 pixels = only 3.2Mp!!!
Canon even sets its out of the camera photos to 180dpi another 10% lower than the early 200ppi requirement.
Basically this tells us/me that often it is the subject that matters and obviously how critical the viewer.
I was quite happy with some of my 2.0Mp images -
original 2Mp Canon Digital ELPH S100
one of which even made it to a CD cover:
original 2Mp Canon Digital ELPH S100
Personally I think that almost any of the modern dSLRs are more than capable of taking technically good photos -
any Mp count greater than about 8Mp is more than adequate for most general usage -
and although many will say the lens matters -
even the most humblest of Pentax kit zooms do acquit themselves well -
6Mp Pentax K100D + 18-55mm kit zoom wide open - EXIF attached
K-5 + 50-200mm kit zoom wide open - EXIF attached
this is the lens that got a mediocre review at PhotoZone.de
Just to put things into context -
this shot:
was taken on a <$80 Canon A1200 almost auto-everything p&s
Please see:
$80 p&s compact thread (
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