Sorry, please don't mind if hijack this thread somewhat and hopefully, it might be a good reference for TS.
How about using zoom lenses like the sigma 50-500 os and 150-500 os for birding? Comparatively with the oem prime lenses? Weight, IQ, value for money? I have read the reviews for these supertelephoto zoom lenses, just like to see from the point of view of the birding and wildlife veterans. Thank you.
Weight for sigma 50-500 and 150-500 is definitely lighter, however the speed loose out a lot.
I still remember very clearly 3 years ago when we was shooting a particular bird in a very low light condition. We was waiting for it to perch on this particular flower as we notice its feeding behavior and every 2 hours the fellow will come to this particular flower and feed for 2 sec. That time I was still using a zoom lens (Tamron 200-500mm). It took me 6 hours (3 tries) to get a decent shot. One year later I went back with a 500mm F4, under the same low light condition and same feeding patterns, I nailed that bird with only 1 try and i can dump my previous photos. The sharpness and speed is incredible for prime lens.
Birding photography is very different from the rest of the type of photography. Birding photography requires good gears which are react fast, lens used has to be sharp as most of the time the birds are so far away and it is very hard to approach them, 99% of the time the birds are not co-operative and they tend to jump around the place.
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