I believe it does need IR though but it still needs the pop-flash to reliably trigger the external flash.
Over the IR signal goes the flash output information and such I believe.

Here is a demo video from Pentax link

Because the OP is talking about a K100D.

When do you think the new JPG (JPG2000) will be supported by cameras?

No you're quite right.
Resolution stay the same with both so overall sharpness stays the same and the only thing the compression introduce are artifacts since it tries to simplify the photo.

With RAW however you can pullout more details, colours and more with processing compared to JPG and that's why you shoot in RAW to work on it later to get a better result.
If you like spending time polishing your photos on your PC then RAW is for you if you don't want to do that then shoot JPEG it's more then good enough like you said you hardly see a difference.

Here are some good reads for you.
RAW
JPEG & TIFF it's mostly about compression of the JPEG

Ah well who doesn't have problems nowadays?
Even the high-end Canon 1D mark III had some problems when it appeared, they pulled back their whole stock so the K-7 isn't doing that bad.

The site does support GIF, it's not the best but it's a start.

don't know if APNG work, let's try.



John could you tell us what Formats we can use and what HTML codes works in comments?

With 1536 x 1024 you have a DPI of 256 when printing 4x6" (10x15cm) size so good for that size.

Indeed and we haven't even started making a lens yet...

Sorry but I can't fully agree with that John because lens performance is truly only about physical dimensions.
What I'm trying to say is that if the same lens is mounted on both sensors with the same amount of pixels the lens will be sharper on the FF sensor.

With your example.
I would also still say that the FF photo will look sharper since the pixel density of the APS-C is smaller so the lens needs to preform better then with the FF sensor.

ps. I hope that this is understandable.

Would like to add something to that.
Since the APS-C sensor is smaller then FF we need to enlarge it more to get the same print size so the extra sharpness that you get from only using the middle of the lens is payed in a bit again.

Also like all small things tolerances are more critical, it's easier to design a superb MF lens then a 3/4th one for example.

First of all you got some bits wrong, sorry to start with that.
For APS-C sensor every company use their own sizes but all are roughly the same.

Here are the crop factors for APS-C cameras.
1.6× — Canon
1.54× — Pentax K20D, Pentax K-7
1.53× — Pentax (the rest)
1.5× — all Nikon DSLR, all Fuji, Sony , and Konica Minolta DSLR cameras.

Now that makes things easier right...


Back to your question.
That's fully correct because we speak of a 35mm equivalent focal length.
It simply means that the angle of view of the lens corespondent with each other.

Since an APS-C is always smaller then FF it means that the angle of view is also smaller.
So to get the same "framing" so they say you need to multiply the Lens used the APS-C with roughly 1.5 to get the same angle of view (framing) of the shot and vice versa of course.

If you would crop away 33% (my math isn't so great at the moment so can be wrong) of the Fullframe image you will get the same photo as with a APS-C

Hopefully this makes things more clear.
Grey part is FF size and the coloured part APS-C.