Originally posted by RHN12 are other lenses readily available?
You will want to become familiar with the lens information available at
Antique and Classic Cameras. Most of those lenses show up on e Bay, some of them with regular frequency. Some of the "buy it now" prices are inflated, but if you're patient you can often get extraordinarily good deals on anything from the 45mm to the 300mm primes.
Originally posted by RHN12 And I understand the prisms are interchangeable - for what reason and what are the options?
- Metered Pentaprism finder: For eye-level focus, composition, and metering. Works like a 35mm SLR. Make sure you don't let light leak around the eyecup or it can fool the meter. This meter comes with a risk of breaking the small chain that transmits metering info from the lens to the body: ALWAYS MAKE SURE NO LENS IS MOUNTED BEFORE MOUTING THE METERED FINDER. Order of operation: 1) Remove lens; 2) mount metered finder; 3) mount lens.
- Non-metered Pentaprism finder: For eye-level focus and composition. Metering is done with a hand-held meter, or use the "Sunny 16" rule. Not having the meter saves a bit of weight.
- As with 35mm or DSLR cameras, the pentaprism finders don't quite show 100% of the negative area.
- Waist level finder (WLF): Shows 100% of the negative area. Allows you to compose while holding the camera at waist level, as with a twin lens reflex (TLR), which can be fun for more innocuous street or candid shooting. Has a flip-out magnifier to assist with focusing. Weighs the least of all the finders. Not practical for shooting in portrait orientation.
- Rigid or "chimney" finder: Shows 100% of the negative area. Superb for use on a tripod; gives a big, bright view of the image. Not the best for shooting in portrait orientation, though on a tripod with still life compositions it's not impossible.
- Both the WLF and "chimney" finders show the image exactly as projected onto the focus screen, i.e., flipped left-to-right (lacking the extra flip that a pentaprism provides)
The manuals for cameras, finders, and other accessories can be found on line if you hunt around a bit.
Hope that helps.
Sterling