If you ask me, these are two lenses that serve completely different purposes.
DA40 - Great picture quality, very, very fast autofocus (probably fastest screw-focus lens), and tiny. Great for walking around and keeping a low-profile. The only problem is that sometimes it's not wide enough for me.
FA31 - Pixie-dust territory, great bokeh, low-light usage but large,heavy and slower to focus - I would not want to drag mine around everywhere I go. I'd be too paranoid to loose it or scratch it.
I would recommend the DA15 and DA40 combo for starts - great for walking/traveling light and taking great pictures.
You can add the DA70 at a later date for a nice 3-some combo.
Originally posted by altovintner In planning my lens purchases, I have been lusting over the possibility of getting an FA 31mm f1.8. Probably have spent 6 hours reading the reviews here and elsewhere and the various posts in these forums. Best price brand new seems to be about $1,000 at B&H:
Pentax smc Pentax FA 31mm f/1.8 Limited (Black) 20290 B&H Photo
But, I recently noticed that the DA 40mm f2.8 can be purchased for $245 at Amazon:
Amazon.com: Pentax DA 40mm f/2.8 Ultra Compact Lens for Pentax and Samsung Digital SLR Cameras: Camera & Photo
Given that either lens would be my walk-around prime, what do you folks thing about springing for the $245 40mm instead of the 31mm? That seems like an incredible value --- 1/4 the cost of the 31mm. For less than $1,000, I could get the 40mm and also the DA 15mm f4.
What do you think? Do you think the 31mm --- admittedly better for the APS-C than the 40mm --- is worth it at 4 times the price?
Thanks!