Originally Posted by Karl K
Yup, they existed for sure, but I've never seen one in the flesh or listed for sale anywhere.
KEH had one a while back. It might have been for the ETR series, though. I remember it was the less expensive version. They are without a doubt rare.
I do use a digital device in my photographic pursuits when necessary.
When someone rags on me for using film, I use a middle digit, upraised.