>>2718185>don't ever buy old Sigma glassSome very decent lenses have been made by Sigma.
It would be more useful to say don't buy shit lenses, or lenses you can't review objectively before buying.
>>2718186Mine would give extremely variable results. Depended entirely on lighting conditions, mostly the angle of entry into the lens, and probably also related to the additional light that bounces around in a fullframe lens on a crop camera. But it did make it impossible to meter properly in a significant portion of cases. At first I didn't notice because I wasn't familiar with anything different and editing gives some lattitude. But it is very apparent looking back on photos from that time. I wouldn't tolerate that again.
...never mind that the habit of centre focusing is bad, and focus and recomposing almost as bad if not a worse habit on wider focallenghts....and of course the useless black blobs that hemisphers and prisms become when there is low light... fuck that.
/p/ has debated me on this since the first time I suggested bare high contrast as being superior to hemispheres... and yet afaik every time someone actually tries a HC screen they come away seeing the advantages.
