I think they need better sharpness and more contrast. The first image comes closest in this respect.

It looks as though it will be useable from about 19mm onwards on a film SLR. I've yet to try it properly, but the vignetting as seen in the viewfinder seems to clear up at about that point.

I've just been checking out the DA lenses on a film SLR and, visually through the viewfinder at least, they all seem fairly promising at the middle to long end of their zoom range.

At the widest setting they all vignette horribly, but taking the 12-24mm as an example, by 14mm it's starting to cover the full frame.

Considering that so many camera club judges keep suggesting burning-in the corners of prints, we could be on to a winner here!

I've yet to explore it, but using DA lenses on a film camera might give interesting results.

Sometimes a "disadvantage" can be used creatively. A soft focus lens is the most common example of this.

If you were lucky, it may not work. If you were unlucky, you could corrupt the firmware and render the camera useless without a factory repair.

Why would you want to do this when Samsung have their own firmware updates?

:

As a rule of thumb if the lens is set to, say, f11 I use the DOF figures for f8.

If we are very pedantic, there is no DOF. The only sharp plane is the one focused on....

There are other factors involved - the Circle of Confusion will be smaller for the smaller format lens, which should equalise that out and still give us the extra DOF. Don't forget that we are looking at Real World situations here and this is what we see on the finished print. Try it and see.

If the enlargement sizes are the same then the larger format needs less enlargement than the smaller format to give a similar degree of sharpness. That is, about 4 lpmm on the print. This is true for every size of print. What also changes though is that the grain on the film is less apparent and the gradation is smoother and the resolution is not so far short that it negates the advantages.

Looked at another way, the 35mm print is sharp and a bigger 6x6cm print will be as sharp. There is enough resolution to deliver what is required for the eye to perceive on the print. I think 4 lpmm is the standard required for viewing at 1 metre.

The other factor is viewing distance. You don't generally view 20" wide prints at 1 metre, but much further away. Unless of course you are a certain type of Camera Club Judge, and then anything is possible...

Yes.

So the APS-C lens will need higher resolution for the same degree of enlargement, which is borne out by lens design.

This is why test figures for superb medium format lenses seem very low when compared to 35mm format lenses.

That's close, but don't forget that a , say, 50mm lens is always a 50mm lens regardless of what size sensor you put behind it. And at a given distance will always have the same DOF.

What changes is the sensor size, so on a small format it will be a telephoto with the same DOF that it will be on a large format, but in the latter case it will be a standard or wide angle lens.

If you take the "standard lens" for a format, it will have a different focal length depending on format size and small formats (110 = 24mm) will have more DOF than large formats (6x6cm = 80mm) for the same field of view. THis is what leads us to believe that more DOF is there with small sensors, and for practical purposes there is.

Other factors also come into this, but it's too early to go into all that now!

I think it's because the battery delivers full power to the camera for almost all its charge and then suddenly dips at the end.

This is quite possibly a good thing in terms of camera performance.