The Pentax 12-24mm is a superb lens, but it won't cover the 35mm frame.

No, save as a JPEG if that is what is required.

What you could do is save your original as an uncompressed TIFF and then save under another file name the JPEG version for the processor. Best of both worlds then.

First, prepare your two images and crop then to the size you want. 18 x 6 at a resolution of 300ppi. (This is done in Image>Image Size)

The create a "piece of paper" to put them on. This is created by going File>New and then defining the size of your paper (18 x 12 at 300ppi)

Now drag and drop your two images onto the paper using the Move tool. Make sure they are lined up properly. Then Flatten the image as at this point you will have three layers (the background, Image 1 and Image 2).

Save As a TIFF.

Easier to show you than describe it, but I hope that helps. If you are in doubt about any part of that, just ask.

In Photoshop you could create a 18 x 12 image comprising two 18 x 6 pictures.

Welcome!

Yes you can use the old lenses, but using lenses with an "A" on the aperture ring (A series or later) will be much easier.

The detailed ins and outs of this are well documented on the forum already - why not have a look at some of the older threads on the subject?

You can log in from any PC but maybe your work administrators have only a restricted range of sites that are allowed.

Dry and well aired. Closed, damp cupboards and cases are the worst scenario.

Spores are everywhere, just leave out a piece of bread and watch the Mucor grow.

It's worth remembering that on foums no-one can see your intention behind the words. hence we have smilies so we know if a poster is being amusing, frivolous, serious, tongue-in-cheek or whatever.

There's no need for heated discussions - it's possible to have different opinions and still be friends.

Those 34 are EU-only, if you change the search to worldwide then you will find a few more...

Supply and demand.

I guess it depends on who is watching at the critical time and how many are competing for a coveted item. When a couple of bidders get serious anything can happen.

I wonder if there are eBay addicts who just can't resist bidding. I suppose there will be.