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					Originally Posted by bn2cardz  I am a clean slate.  I have never bought one or know anyone that collects them, but I find them very interesting and have been wanting to start.
 I have always found vintage photographs interesting, but there are so many of them I have never known where to start.  I am looking for a good resource to find information about vintage photos and how to discern the different types (type 1 - type4).
 
 In particular how can someone tell when the photo was made?
 
 What characteristics are PSA/DNA looking at to make their judgement?
 
 Are there any good books and/or websites that are great resources to educate myself on this large spectrum of collecting?
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 I recommend starting with David's website: 
http://www.cycleback.com/
I haven't been impressed with the PSA/DNA photograph-slabbing experiment - it's just led to more trimming of vintage photos, and attempts by auction houses to use terminology that they clearly don't have a good grip on - I've seen several photos incorrectly id'd as type 1's (one questionable one is going to sell tonight for thousands of $$$'s).  On the flip side, buyers rely on the 'type' designations now and a lot of non-labeled bargains can be found.
I think we were better off when we were provided good clear scans of both the backs and fronts of untrimmed photos, and made decisions based on those, as opposed to a semi-meaningless photo slab.