Some resources that I’ve found useful on my travels or at home.
First Light by Joe Cornish. A collection of images illustrating the importance and effect of lighting conditions in photography. No longer in print but this hardcover book is still widely available from resellers on Amazon and AbeBooks.
Phillip Reeve - A multi-author blog with a hugely detailed resource covering manual and vintage lenses, as well as Sony E-mount lenses both old and new.
Photo Warehouse - 105 Fitzgerald Avenue, Christchurch, New Zealand. Kind enough to do an emergency battery charge for me before I'd acquired a suitable UK->NZ adaptor.
Pro Photo Supply. Portland, OR. Retail outlet with a wide variety of bodies, lenses and accessories.