Yes, certainly! You might want an accessory finder for the new field of view, to frame your shots, though.
Thanks!
yea, I ifgured a hotshoe finder would be needed for something wider or longer.
No it isn't.
For starters, the chances off getting a finder for a 53mm are zilch and/or nil.
For seconds the 53 is just a number. The standard focal length of these lenses is 52.3, irrespective of their being labelled 50, 52, or 53mm
For thirds, this is the rangefinder world, so don't kid yourself things are that accurate. If there was any difference between the on-board finder and an accessory finder, it would be down to luck, not design.
Clearly, if you were getting a tele or a wide angle, say an 85 or 35, an accessory finder would be warranted. Further, you may get value from a 50mm finder that has a suspended frame and hence is used differently from the standard finder. The Leitz SBOOI is one example. Another is the Voigtlander Kontur finder, which uses both eyes open viewing. The former is expensive, the latter is cheap. I use the Kontur regulalrly on the FED-1 but you will likely find the FED-3 finder quite satisfactory.