Originally posted by screwdriver222 you need to have bought one of Tony Northrup's books to get full access
That would be a red flag for me, if only because there's an inbuilt subtext that thou art being admitted into a closed society and thou shalt follow the wisdom of the guru. I'm not speaking of Northrup specifically here - I'm sure he knows his art as a photographer, and he's got a right to his equipment preferences - but ANY forum that you have to have bought your way into in this fashion has this potential problem, regardless of whether it's photography or something else. I've seen quite a bit of his stuff on YouTube and his bias towards NIkon is clearly apparent, but it's not the strongest I've seen by any means, and what I've said about a photographer's right to their own equipment bias stands, so long as they're not going out of their way to trash someone else's.
That being said, there's a YouTube video of his in which he pits what appears to be a top-of-the-line Nikon DSLR against what is clearly Yesterday's Pentax and shows how you can make up the performance gap in post-processing - useful to know if you don't have the latest and greatest, but not exactly an apples to apples comparison and possibly carries the risk of leaving a wrong impression in some people's minds as to the relative merits of the two brands.