Originally posted by rbelyell interesting. i have a ks2. ive used a fuji xp1, xt1 and still have an x100. ive used a kodak slr/n and a canon 5d. after all this experience, i find the 'green button' itself the major limitation of the system, and one of the biggest limitations ive come across in any camera. on any of the above cameras ive used, 'analouge' controlled, mirrorless or slr, they all were able to autometer non native lenses. not being able to perform that simple function my friend baffles me every day when i look at that green button. that is actually day to day limiting. again, you and i will have to agree to disagree, as i see nothing 'complex' in the turning of an analogue knob. as for simple, nothing can be simpler than avoiding 'interfaces' altogether by physically turning a couple of knobs. my epson rd1 is simply put the simplest digital camera ive ever used: 3 dials and auto iso-i set the menus one time and virtually never looked at a menu again in over five years use. thats simple for the most simple.
Pentax K-mount cameras also autometer when used with non native lenses, FI when using m42 lenses. The big difference is that the other cameras do not have 40 years old native lenses.
The limitation K-mount cameras is only with native lenses that do no communicate electronically with the camera. The limitation is because K-mount lenses are kept wide open when stopped down until shutter is pressed.
Green button is used for much more than when using old manual lenses. FI for reset ISO to auto, or to set exposure when using spot meter in manual mode.
Try setting exposure compensation on Nikon Df using a heavy lens while looking though the viewfinder.
Retro interface may work well when not in a hurry, but is not as flexible as modern interface that is quicker to use, and fewer controls has to be used so you do not have to change grip to set exposure.
So modern interface can better fit for all types of shooting situations.
The Epson RD1 is retro done the right way. a manual focus camera with aperture ring on all native lenses, with very limited controls and no dual interface.
On RD1 you can even reverse the LCD and all button on the back to complete the retro experience.