I just signed up for a BIF photography class being put on by a photographer I have great respect for in the genre. David Lychenheim spends much of his time photographing bald eagles at Conowingo Dam (north Maryland, about an hour from me). You can see his work on Facebook at Conowingo Bald Eagles. One of the prerequisites for his class was that students had to have a DSLR. I asked him before, and Mirrorless is not allowed. I'm not sure if it's just because he's not familiar with them and doesn't feel qualified to teach users of them, or if he doesn't think they're serious enough for BIF. I'd be disappointed if it were the latter, and while I suppose I could understand the former (can't blame someone for not knowing, or being comfortable teaching it), I'm not sure it's correct either. While I know there are differences in technique between using my DSLR (which is specialized for sports and wildlife) vs my E-M1 for BIF, I think I can learn a lot from him regardless of which camera I am using. Is it really so much different than, say, Canon vs Nikon? Or is there really such a negative stigma for mirrorless among wildlife photographers?