As usual, much depends on the usage and circumstance when making such choices. The FA 77mm is amazingly compact and with amazing imaging for a lens of this FL. I've had this lens for many years, bought new for use on my Pentax 35mm bodies. It is a silver version MIJ. After getting my K-1 II, I decided to also get a new black one of the HD version. I have the DA HD 70mm as well, now for several years, because it is actually quite different in FL (actually 65mm while the FA 77mm is right on), in aperture speed, and thus usage. It is better if wanting to avoid fringing, have more in the frame, and better edge-to-edge sharpness.
The FA 77mm is so very useful, and so very portable. Great for easy carrying when bicycle-riding. It can even do great closeups, as shown above. Very effective for bug-on-flower shots, as its small size is less likely to disturb small critters, and longer FL to give some distance. Just do left-eye to the VF to hide your eyes. This lens is ideal for doing candids during gatherings of friends or family, as it does not attract attention near as much due to its small size. To go with your new K-3 III, I would recommend the added perfection of the HD version to gain better results against flair that can occur under some lighting conditions.
---------- Post added 07-10-22 at 12:27 PM ----------
Originally posted by Sandy Hancock The only one I'm certain I will always keep is the FA77. It may not be quite as amazing as the weighty eighties, but it's easily good enough for my humble needs - while offering compactness, beauty, and joy
My experience exactly! I don't have any of the weighty eighties, but imaging from my FA 77 Ltds has been amazing, bokeh is wonderful, and can be just the thing to choose for so many situations.