Interesting article. I don't know if C/N move out of the DSLR marker will have any impact on the probability of success of Ricoh strategy (i.e. the probability that it stays in the market). The market for "entry level" interchangeable lenses cameras has almost disappeared, together with the associated type of customers. Those having a random d5300 with kit lens lying around will never go to the market, if ever, with unconditional love for the optical viewfinder so that they will consider buying Pentax because they want a DSLR. They absolutely do not care and will buy whatever has the best specs, or just use their phone. This, even in the event that Pentax decides to release a low-budget DSLR (like the good K70).
The only people with a strong enough opinion on viewfinders/philosophy/attention to the "experience" of shooting a camera are enthusiasts or professionals. In this group, Canon/Nikon DSLR users still have the very compelling option of a gradual transition to the new ML systems using adapters that work fairly well, to keep at least some of their lenses. The strength of this push is proportional to how much money they have invested in top quality glass. I am under the impression, from reading some general photography forums, that this possibility far outweighs the preference for optical viewfinders. Couple this with the fact that EVFs are catching up fast in quality and usability and I remain with the question: will there be enough customers motivated enough to switch brands to Pentax or new customers starting from scratch that are willing to buy into the Pentax system ? I have to assume that Ricoh has done their market research to answer this question...
One thing I would invest on is in developing the viewfinder eye-af technology they have started to implement with the K-3iii, maybe with a better implementation on a new K-1iii ? I don't know what the technical limits of such a solution are. But what if it can be developed to at least catch up with ML cameras of a few years ago ? (Already sufficient for most users, not everybody wants animal-eye AF at 50fps on 60MP sensors to use with 1200mm lenses from 1km away...). It's a technology that could sort of bridge the gap between the two worlds. The main selling point for MLs is that kind of AF performance, and what if Pentax DLSRs can get close ?
And video...naturally video. There is a growing market for hybrid shooters who want hybrid cameras. This is another market trend that, unfortunately, is not in favor of DSLR technology. (Personally, I don't care in the slightest and I would love a stills-only camera with no video switch
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