Another from the same outing. The pictures demonstrates the span of reach from the A 15 f/3.5 lens.
DSC06409 by maverick_h, on Flickr
DSC06408 by maverick_h, on Flickr
What it does seem to show is how old ultra wides such as this did it the 'right way', correcting barrel distortion optically as much as possible.
Hence the weight, cost of a lens like this.
Many modern UWA (esp the MILC ones) are just corrected minimally and then rest left to software correction.
Last photo. I simply love the deep intense purplish red coming from this tulip.
https://flic.kr/p/GnyG54DSC06522 by maverick_h, on Flickr
H Some claims that the DA 100mm f/ 2.8 Macro is sharper. I think the round blades frm the DA version probably gives a nicer bokeh.