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If you are in Flickr I recommend you Critique2 About the group: Critique 2 is all about member participation. Think of this group as a workshop, where you can display your work to other photographers of all levels of experience and skill, for discussion of its strengths and weaknesses, suggestions for improvement and hints for overcoming shortcomings. ...
Either jump in chat here or go to a photo sharing site such as one of the ones that jrista mentioned. There are very, very many options out there. Photo sharing sites like flickr and 500px probably are the easiest kind of thing if you are looking to find photographers whose style you like.
I use M42 and pentak K lenses on my Canon 40D with precision matte focus screen and it works really well with the EMF programmable adaptor chips (some of them even allow you to use tracking AF modes), but if I had to get a camera specifically for that purpose I'd get pentax, where of course K5 with a would be a better but more expensive choice, but K10D is a ...
Google+ seems to be the most active social network for photographers to hang out with each other. It treats the photos pretty well visually, but the communities are also quite good for building discussion around topics rather than just dropping images on each other. The community I founded, Bird Photography ...
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