Does AF work with small aperture lenses (Sigma 150-500)

trumpyman said:

I dont understand when he says its not 4 stops,but 1/40ths at 450mm is pretty good.>

Click to expand...

It’s only my gut feeling that I would have expected better results from the few hand-held trial shots I've made if I had shot 4 stops faster without OS (which would probably have needed a D3s or D4 sensor!). Although I’m not convinced I got a 4-stop improvement, I would need to make a lot of comparison shots to be sure the lens doesn’t give me a 4-stop improvement. I love your tiger, but 4 stops faster would be 1/640th, which doesn’t sound too much of a challenge at 450mm, although I’m still very inexperienced at these focal lengths, and I expect your hands are steadier than mine.

The cold spell in England has led a flock of redwings and fieldfares to feed on the berries on the pyracantha beside our garage. This gave me a chance for some worthwhile shots with my new lens (although shooting through window glass will have degraded them somewhat). Here are a couple of the better ones. (It also showed me that I need a better tripod head to aim the lens well.)