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Tell me about the 20/3.5 - how do you like it? Is it sharp enough for a wide angle? This is one of those lenses I've been thinking of trying out due to the flare/ghost resistance and great sun stars it's supposedly capable of.
It's great for its size/weight, but sharpness near infinity could be better, even at f8. But whenever I put together camera gear for a hiking or a ski tour, I like it for its size and the ability to use filters. I haven't really done any sun star test with it, but now that you mention it, I'll have to give it a go.
The 20mm f3.5 output is "good enough" for my needs, and I am just tickled tht I can shoot this wide after my DX body days. Wide angles that beat it in sharpness, field of view, and wide open performance (night sky) are usually much heavier and can't take filters (Rokinon 14mm, Nikon 14-24mm). And it is cheap - I found mine for $100, so, hey, I can't even rent a 14-24mm for my next trip under $250...
Secretly, I am really looking for an old Tokina 17mm f3.5, as that would be my ideal hiking ultra-wide lens.