Wide angle question/favour

huge ask , Could some one who has a sigma or other wide angle lens, (10-20mm lens) Would you take a shot for me at the wide end and then take same shot on a lens at 42mm just as a comparison as to how wide this really is , I have tried the link on the tamron sight however i feel its not that much of a good representation, Think i am going to wait and get the SIGMA 10-20mm F3.5 EX DC HSM, but cant find any priceing,

Ps thanks for the info its apriciated

I think 42mm may be a typo ?

Photozone.de has some photos you can compare up of both (not the new sigma).

If you meant 12mm vs 10mm there's examples around

HERE (scroll down)

HERE

Plenty of others around. It looks like a huge difference, but in reality can be equalled out by taking a few steps. If you absolutely need the width because you can't move then the Sigma is your only option at present. Tamron are releasing a 10-24mm but not sure when we'll se it in Pentax fitment.

Giving you a kind Hand.

43mm DA*16-50mm f8
[IMG]http://i517.photobucket.com/albums/u332/nathanever82/_IGP0032.jpg[/IMG]

24mm DA*16-50mm f8
[IMG]http://i517.photobucket.com/albums/u332/nathanever82/_IGP0031.jpg[/IMG]

12mm DA10-17mm f8
[IMG]http://i517.photobucket.com/albums/u332/nathanever82/_IGP0033.jpg[/IMG]

10mm DA10-17mm f8
[IMG]http://i517.photobucket.com/albums/u332/nathanever82/_IGP0034.jpg[/IMG]


Hope it helps.

'The stalker'

Don't forget that the 10-17 fisheye has a greater field of view than a rectilinear (non - fisheye) lens at the same focal length so a Sigma 10-20 @ 10mm would be different to the above example.

Wow , And thank you , Much Appriciated, Could I just ask what camera where these shot with?. I am shocked by the huge difference between the shots, Is last shot a fish eye?

Helps me tremendiously

'The often Stalked'

Yes the 10-17 is a fish eye, and see RR's message above.

camera K10 - uploaded the 2mp small jpegs that came with the RAW+ (couldn't be bothered developing)

Obviously on a tripod from the same spot.

The 12 and 10 mm shots are with the fish-eye DA10-17mm, so as RR was saying, very different from a rectilinear lens, like the Sigma 10-20, or others.
The angle of view is supposed to be 180 degrees on the diagonal.

Well you keep asking and you didn't look so here's a photo at 10mm

link

No, I have looked already, However I would like it to be compared with something for comparison, against my sigma 28mm(obviously 42mm on cropped sensor)

The main reason for the wide angle are for family group portraits and wide angle landscape shots etc, However would be interestinfg to see the comparison with a normal wide angle lens as well

You still haven't quite grasped focal lengths yet I don't think (reading this thread again).

If you're looking for a comparison between what you have at the moment (a 28-200 zoom), and a 10mm lens, then you need comparison shots at 10mm and 28mm. Forget about 42mm. It's irrelevant.

By the way, you will see a massive difference. If I had the time, and it wasn't 12.45am, I'd take a couple of shots to show you. Maybe tomorrow...

Dan

You definitely do NOT want to do family portraits at 10mm
In a rectilinear lens, the edges distort the geometry - so a square looks an odd oblong shape. (In this respect the fisheye are better - they curve, but a square still looks a square.)
The faces of people on the edges are distinctly odd if taken close.

The widest I'd go for a portrait group is 16mm (e.g. DA16-45, or my current DA17-70 )

And, as many have experienced, unless you have a truly impressive landscape, taking a shot at 10mm or 12mm can give an underwhelming shot. It takes a lot of practice and skill to get a really good super wide angle shot.

Matt

Here are two I took last year. Though not quite from the same spot they do show the difference between 10mm and 18mm.

[IMG]http://i28.photobucket.com/albums/c205/Bargwynbu/Goosenecksweb1.jpg[/IMG]
@10mm with the Sigma 10-20mm


[IMG]http://i28.photobucket.com/albums/c205/Bargwynbu/IMGP6543-web.jpg[/IMG]
@18mm with the Pentax kit lens.

The diagonal field of view of a 10mm rectilinear lens on a Pentax DSLR is 110.53 degrees

The diagonal field of view of a 20mm rectilinear lens on a Pentax DSLR is 71.59 degrees.

Checkout this site http://kmp.bdimitrov.de/technology/fov.html