Originally posted by madison_wi_gal I was advised that Señor 43 can be a great lens WHEN YOU USE IT FOR SOMETHING IT IS GOOD AT,
When you do finally get your K-1 II, you will find, the FA 43mm Ltd to be "good" for many scenes, compared to usig it on APS-C. Much more versatile. Then there is the matter of prespective. As you have experienced, with many scenes using a WA lens will make distant components look farther away behind the closer subjects compared to the realty you see in person. If there are some closer structures like a house or other building somewhat closer in the scene, it will appear elongated if in a three-quarter view position. Exaggerated 3-D. OTOH, if useing a 50mm "normal" lens on a FF body, or 35mm "normal" lens on APS-C, it is still not quite normal but a wee bit on the tele side, therefore a bit flat. At 28mm on APS-C you will get a similar prespective to 43mm on a FF body, which will give you a natural 3-D look as if you were there. Even more true if you have a main subject standing at some little distance in the foreground, then the background will appear at natural distance as you see it when standing there to take your shots. It is a true standard "normal" lens, and at the same time lets more into the frame than does a 50mm, for better versatility. A very natural 3-D look.
When I first started back when there was no auto anything, it was a Vivitar 35mm film SLR with a 50mm lens. That was all I had to shoot with for some 6 years, until it broke down, then I acquired a Pentax ME Super + M 50mm f/1.4, a 28mm f/2.8, and a moderate tele zoom lens- I think f/3.5 or so. I had become rather tired of the 50mm limitations and look, yet the 28mm was to me rather wide for all-around, and having exaggerated perspective. When I got the little M 40mm f/2.8 it was just the ticket, and wonderful as a compact-carrying all-around. When Later I got the FA 43mm Ltd with its brighter VF showing, and excellent imaging, I liked it even better. Also great for low light use, so I rarely went back to the 50mm.
For APS-C use, you'd need a good 28mm prime to get the same perspective- like the FA 28mm or "F" 28mm f/2.8 lenses. These are fine lenses, not expensive, and can produce edge-to-edge sharpness, even wide open.
My new HD 43mm Ltd is showing to be sharper than my old FA 43mm Ltd of many years. I've been getting great night scenes from it on my K-1 II, fine sharpness at all apertures, and of course super sharp even a little stopped down. Unlike some reports, this is not a tunnel-vision lens for sharpness! Any degradation at all is at the exreme edges/corners and wide open. I agree with northcoastgreg.