Originally posted by Clavius ...
Don't get me wrong. I'm not a neysayer. I'm just trying to understand what the FF-fuss is all about. I just don't understand the added value. And that could be me. I don't understand the added value of lots of things: liveview, I-pad's, the Euro, etc...
It sounds like you're new to the concept and just need some basic questions answered about the difference between the two formats - nothing wrong with that.
Here is a link to a pretty simple overview of some of the differences you'd see from shooter's perspective. It's written in layman's language by a guy who (I think) pretends to be a little dumber than he actually is
as part of his schtick, but it contains some good nuggets of information that might be useful to you, and includes some image rollovers, etc -->
the full frame advantage Quote: *: Please no graphs, our camera's do not produce graphs, and we don't hang graphs on the walls of our homes. And graphs can lie. Pictures hardly can.
This seems like it should be true, that pictures can't lie.... but they can.
The main problem is when pictures are shown out of context. Showing a FF shot without it's equivalent aps-c shot may make people look at the FF shot and say 'so what'? My aps-c camera can do that!", when in fact in some cases that aps-c camera
can't quite do that, because for example there's no lens available for aps-c that will give you the same FOV and DOF combo, or if it could give you the same FOV/DOF, that lens would have to be very expensive and large on aps-c to do so.
Here's a quick example of that - the following shot was taken as I was just standing over my little guy, at 35mm, f/1.8 on FF. Now, this looks just like a typical shallow-DOF shot, but in fact to get that exact shot on aps-c you'd need to be shooting a 23mm f/1.2 lens wide-open - and they don't make one of those. Because this shot is shown out of context, it doesn't seem like it's any different from a typical aps-c shot - but it is, a bit.
It also seems like it should be easy to ask for 'equivalent' shots from aps-c and FF, but I've owned both formats for over a year and a half now, and aside from some saltshaker test shots, I've maybe only taken one or two shots with the two formats side by side while maintaining equivalent aperture and FOV. So it's hard to show you in one image comparison - it tends to be something you 'see' and start to enjoy with iterations. Anyway, here's one comparison I have saved:
Left: DA35mm @ f2.8, right: Nikon 50 1.8D @ f/2.8, same distance to subject:
You should be able to see the 1.3 stops difference in DOF for the same FOV there, even though they were shot at the same aperture. If I wanted to stop down the FF shot to about f/4.5, it would give about the same DOF, gaining additional sharpness and contrast on the subject also that comes from f/4.5.
Where is this useful? Anyplace you want just a bit more subject isolation at equivalent FOVs, or want a tad more 'depth' on medium telephoto shots for the same FOV.
The other advantages to FF are, in a nutshell: at least a stop better high-ISO performance (ISO 6400 on FF looks like ISO 3200 on K-5 and about ISO 1400 on K-7,) sensor is more forgiving for AF and focus errors in general, faster-AF lock (usually comes with the bodies, not format-specific,) and larger viewfinder - easier for composition and manual focus. (Using the affordable D700 as the FF baseline - ISO performance and AF lock are going to vary from body to body of course.)
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