Well I said I was going to spend some energy looking at HOW to carry a DSLR on the bike.
I've looked at this before over the years, and tried a lot of different things.
The only real way to get decent photo's without hassle is a tank bag. I've tried back-pack (remove gloves, take off backpack, get camera, etc..). It does not sound like much, but I always found removing a backpack to be a absolute pain for some reason.
I also tried a top-box approach, but this was even worse. Either you have to get off the bike completely, or near break your lower spine in twisting around to access it.
I even had a brief try of a DSLR chest pack. Terrible; don't try this!!!
So the conclusion was a tank-bag.
I'm protective of my camera gear, so wanted something specific to cameras, water-resistant, and also room for non-camera items (like money, passport, smokes, etc..)
I have a Kata holster, and LOVE it - quick access, incredibly good quality, and has been BRILLIANT over the last couple of years. Highly recommend these. You can get a massive amount of kit in these bags!
I was planning on combing it with this generic tank harness from Kriega - I use their other bags for touring, and just love them and the quality. It is a general fitting "tank-bra" that you can clip in other components. I was planning on rigging some quick release buckles to the Kata camera bag, and hey presto!
BUT what I ended up with though was a bit unplanned - a touratech camera tank bag. They were not on my radar as are £200!!!! But I found an ebay special - ex-shop-demo, for only £60.
I'll let you all know how I get on with it.....