farlymac
PF McFarland
I don't know what you understand. There are no "APS-C M-mount lenses" ... M-mount lenses are designed for M-mount cameras, all but three have been FF cameras, and one of the alternative-format M-mount cameras had an EVF which obviates all this frame line business entirely. M mount lenses have largely been designed with 28, 35, 50, 75, 90, and 135 mm focal lengths corresponding to the frame lines included in the M4-P and later M series cameras.
The fact that a couple of lenses exist in focal lengths popular on APS-C cameras does not define them as APS-C lenses, since they cover FF format. They are wider alternatives for M-mount camera beyond the standard M viewfinder's capabilities to display frame lines.
The Pixii is a body designed to be used with existing M-mount lenses, since Pixii is not also creating a set of lenses for it. The frame line selector is set to the focal length of the lens you're fitting. The frame lines show you the correct field of view for those lenses on the Pixii sensor in the Pixii viewfinder.
What's so difficult about that?
It might have been nice if they included a 24mm setting due to the popularity of the FoV that focal length provides on APS-C, but they probably found it difficult to do that, so they leave 24mm and shorter focal lengths for an accessory finder. I bet there are a lot more potential M-mount users who own a 28mm lens than a 24mm or shorter focal length lens.
This entire argument about frame lines and focal lengths simply reinforces the limitations of a mechanically coupled, mechano-optical rangefinder/viewfinder design. EVFs and other TTL designs are far more flexible about being able to present a useful viewfinder regardless of the focal length of the lens fitted, which is why RF cameras largely became obsolete when SLRs were able to be produced at popular prices.
G
Ah, now you see my point. Yes, Leica doesn't make "APS-C" lenses. But they do make TL lenses, which is exactly the same thing. And the frame line progression on the Pixii is made for 135 format lenses even though it is an APS-C camera.
If they can't design an optical range/viewfinder to accommodate 18mm and 23/24mm lenses, then it means they didn't have the resources (monetary, financial, and technical) to make an electronic one which would have negated the need for external finders.
You read on here a lot of comments about folks who don't care for the 40mm focal length (I'm not one of them), so they won't be hanging a 28mm on the Pixii. So that leaves you with 50, 60, and 75 equivalent frame lines in the finder having the most usefulness. From a marketing standpoint does it then make any sense to sell a rangefinder manual focus camera that cannot give you at least a 35mm focal length equivalent FOV in the viewfinder? Is someone going to design a goggled lens for this camera? Highly unlikely. Leica tried that three times, and except for the Dual Range Summicron 50 it didn't go over too well.
PF