I use Photoshop on every image in some form or another, becasue it's my "digital darkroom" and just I would select the right grade of paper, dodge and burn in the darkroom I do the equivalent.

Black and white is beautiful with digital - you have the colour image and then apply whatever filer effect you want in Photoshop. Brilliant.

I've expanded your title so people know what you are looking for without having to open the post.

Either way you'll see the degradation of the image. Generally only the very best teleconverters are useful and these cost as much as a marque lens.

Your system contantly needs updating anyway with everything from Adobe Flash Player to Windows itself downloading updates.

I know what you mean, and any one of these updates could cause a problem, but we need the process to keep our systems operational and secure.

Updates to RAW converters will fix bugs and also update the camera list so that the latest models are supported. It's no worse than loading software in the first place, which is also a risk.

Gloves could explain it, but it's not vignetting. Maybe some condensation on the lens that evaporated after a while?

In terms of the Pentax 645, kit usually means camera body, lens and film insert. Obviously we don't need a film insert for the 645D!

It can't do both. And it can't adjust for a lens that's OK at some distances but not at others...but it can provide a better result on average for a given lens.

Modern lenses are quite complex and I guess you get what you pay for in terms of mechanical reliability as well as optical performance.

I'll tell you the story of my Canadian cousin Hazel.

She ventured out of their log cabin to visit the outdoor amenities and found a bear wandering around the yard. She went back in, fetched the shotgun and promptly shot it.

They enjoyed the bear for the next meal or few and now use it as a rug.

The moral of this tale is "Don't mess with my Canadian cousin Hazel."

That's all I have about Canada, apart from telling you I visit the Canadian Photo Club website from time to time, just to see how they are doing and share an image or two!

Well Don, at a stroke you've managed to insult everyone apart from Canadians and possibly small earthworms called Cyril.

Surely you can find something about Canada? :

Vignetting is a darkening of the corners, not a misty whiteness. To avoid confusion over what you are seeing, can you post an example?