Recently I bought for few euros a very nice Exa Ia with Domiplan 50mm. She seems new. I made a test roll and liked very much to use this little but well working camera. The Image quality too was good too, despite Domiplan being the cheaper from the Exa lenses.
Was so impressed by the camera that I've just bought an Exa Ib (M42 mount) to use with my M42 lenses....
You were lucky the Domiplan that came with my Exa 1a is unusable, you can't even see through it something has etched the front element. HAve fun they are nice quirky little cameras.
No it's an ageing fault, I suspect it's the glass used in these lenses as aside from that the lens is in excellent condition. Pre-WWII Novars, Summars and some Tessars are prone to the same softening from airborne pollutants.
Interesting. So far I could relate etching to fingerprints and to mould. And my one and only Domiplane is fine (still?, have to check...)
The chemical composition will effect chemical resistance of the lens, thus there can be something behind lens-typical corrosion.
But I'm lacking experience with pre-war lenses..
In fact, I've been lucky and found a nicely working camera toghether with a good Domiplan. Yes, it's a simple triplet but doesn't work bad. Regarding the tonal range, I try to always get good shadows when metering and films such the Kentmere helps a lot to give an extended grayscale while not burning highlights. The Ars-Imago Fd developer does its job too...