Two Bodies

Im using a K7 which id like to upgrade to a K3 soon.

I like the idea of having 2 bodies but cant thing of any occasions where i would need the 2?

But it doesnt seem worth selling the K7 as its not really worth much.

Any thoughts?

There have been occasions when I wish I had two bodies so that I had a back-up when I broke the main one... On the whole, however, I think it depends on what you photograph. If you do a lot of sports for example, you might want one with a telephoto zoom and one with a mid-range zoom. If you mainly take static things like I do, the second body is probably a luxury. I kept my K10D for a while after I got the K20D, and found that I never used it, so I sold it on.

K.

When doing critical stuff, like shooting a wedding for example, then it's essential to have backups for every situation.

Sue and I use a K-5 each, but there's always the backup K20D available.

Pentax bodies and lenses are so small it's easy to carry two bodies and minimise all the lens switching and missing shots. However, they should really be the same model otherwise you will find yourself favouring the best body to the extent that you end up swapping lenses anyway. K3 an K7 is such a jump I doubt you would ever use the K7 again for anything casual.
It would make a good workhorse in the studio or for test shots rather than using up the actuations on your K3

Double up when walking around, for example

16-50 on one. 50-135 on other

or 18-135 on one and 300mm on the other.

That's exactly what I do.
David

PPG: http://www.pentaxphotogallery.com/artists/davidtrout

I also do this, not the same lenses but the same principal

I just started to double up, with wildlife as my favourite subject I found carrying one body too restrictive as nature can be very unpredictable and too often have find myself in a situation not be able to change lenses quick enough (or lost the subject due making to much noise or to much movement when doing this).

i like the idea of doubling up but as suggested would favor the one body and even then wouldn't know which one to pair with what lens.

I think im best selling and putting the money towards another lens.