I don't think the new 55-300 lens is FF, it's designed to accompany the K70 and needs one of the latest bodies like K-1 & K70 to operate the electronic aperture.

I don't know what software you are using but Lightroom has a one-click feature to eliminate fringing.

I use a Marumi circular polariser of the same diameter as the lens and haven't noticed any vignetting. Have a Cokin 100mm system but not tried it yet on this lens.

Not legacy lenses but Laowa have a FF 15mm macro and are introducing a 12mm f4 lens shortly; both are manual focus available in K-mount and I will be interested to see what the 12mm lens will cost.

Another consideration is that the K-1 works best with full frame lenses which are expensive whereas the other Pentax models with a smaller APS-C sensor have a wide range of excellent lenses available at much more affordable prices.

You are probably right McBrian but I don't find LR as simple and intuitive to use. It's just a quick and easy process to copy images from the sd card into a dedicated storage facility first to make sure that you don't inadvertently lose them.

Lightroom will not retain or alter the original image, just record the changes, and 'import' is just for editing and filing so don't rely on it to keep the original RAW file. I use a dedicated hard drive for photos onto which I copy the ones I want to keep before opening Lightroom, and if possible use a second back-up like a cloud service as well. That way you can clear your sd card when it gets full. I have found that if you move the original or change its title after editing then Lightroom will not associate it with the editing changes, so best to do those first. My hard drive has files for each year within which are files for each month like a calendar, and I just move the images from the sd card into the relevant month before editing. For special events like a holiday or wedding I would create a dedicated sub file within the relevant month. In Lightroom you can tag each image so they can be sorted into groups which are independent of where they are actually stored, and finally after editing I 'save as' the final image as a jpeg.

It seems that a lot of 'beginners' books' are overfilled with computer stuff, I got one from The Works which has at least half it's content about Photoshop. This one I found useful: The Beginner's Photography Guide published by DK; several contributors so no named author, usually found in WH Smith or Waterstones.

Looks a bargain for someone, Billdad, so why are you selling so soon after buying it?

I would just try it in RAW on a semi-automatic setting like AV or TAV and just gradually work through the manual, and use a basic processing programme to see what can be done with the images. It is pretty daunting as the camera is designed to be modified to suit all different situations but most of these can be picked up as you go along. If it helps the manual can be downloaded to an iPad etc. from the Ricoh website