I recently completed a roof project for a relative. This was roof #3 for the home- tore off the previous two layers. The home is about 40 years old with roof trusses and 1/2 (maybe 7/16) plywood sheathing, no clips. Plenty of roof and eave ventilation. As expected, the roof deck seemed to be quite brittle. A 220# guy with a bundle of shingles in hand could have stepped through the roof quite easily.
DSLR Definition: Digital Single Lens Reflex Camera. The Nikon D3000 is a DSLR camera. A DSLR, or digital single lens reflex camera is an advanced type of digital camera that provides high-level image quality, performance levels, and manual control options, typically much better than what you'd receive with a fixed lens camera.
DSLRs > The cheapest > Canon > Full frame. Interested in a cheap Canon DSLR full frame? Here we've rounded up the only three DSLRs full frame from Canon. You might also be interested in checking out full frame DSLRs from other manufacturers such as Nikon or Pentax. Full frame DSLRs are called full frame because they have 36x24mm sensors, the same size as film that older SLRs used. Digital SLRs (also called DSLRs) are the digital equivalent of the old film SLRs.