Originally posted by david94903 Conceptually, I like the idea of converting an older film body into modern digital. But I think in reality it's too little too late. It reminds me of my old Pentax 1.7x teleconverter/AF adapter that I bought in 1991 so I could use my M-series glass as AF glass on my new PZ-1 (yeah, it was a okay teleconverter too but it's appeal was the AF function). It was a novel idea but short lived. It's ability to turn manual glass into AF glass was quickly eclipsed by the reality that AF glass soon became not only available but also affordable. Today, there are so many inexpensive digital camera options available, I don't see a market beyond nostalgia for this product. But maybe that is the market. A few years ago, original Sony Walkman's became all the rage once again at my kid's high school, orange foam covered headphones and all. Thank goodness I still had a couple of them in an old box of electronics. Go figure.
You might be interested to know that the "short-lived" Pentax-F 1.7xAF teleconverter was in manufacture for 10 years and was still available new 20 years after you bought yours (which is about when I bought mine). The point was that there were few new Pentax lenses available in the longer focal lengths at that time, and some of the secondhand ones were priced well above what many (probably most) of us were willing to pay at the time. So, some of my older MF glass was made more useful by the appearance of that little gem, and it doesn't work too badly on my K-1 with the new D FA70-210/4.
So, although we're comparing apples and oranges here, the common thread is that you can put old gear back to work with the addition of a new gadget, if you choose to do so. I won't repeat the pros and cons of this digital back that others have presented perfectly adequately. Suffice it to say that you can do something different with your old film bodies if you think the expenditure justifies it, and that's purely a value judgment for the individual to make. Nonetheless, I think we all should be thankful that someone's got the ingenuity, patience and ability to produce this thing, because, as much as most of us won't buy one, you never know who may be inspired to make something better, whether it's a full-frame sensor version of this or something completely different.