Originally posted by reh321 You are talking about entirely different matters from what I have been talking about.
Have you actually seen this equipment? The adapter has no glass, so there is no reason for it to affect IQ. The sole purpose of this adapter is to make focal lengths available that were not previously available, made possible by dedicated lens/body engineering from the same brand.
This is an adapter that allows Pentax bodies to use Pentax lenses, increasing desirability of both body and lens, keeping $$$ with Pentax that otherwise would go to Nikon or Canon.
My Adapter Does Work.
It's a kludge. All optics are developed to splash across a specific plane of a specific dimension. All you are doing is overlapping by an extension not part of the original design envelope.
Adapters are tech marketing people think up to foster some backward facing loyalty. Look at the cine world for more relevant discussions.
Current lens design is VERY specific to a format. Just one. Look at the contortions of FL with the whole DFA thing in Pentaxland. Is a DA*200 really FF? B&H says NO!!!!
Adapters take a non-native optical formula, complete with barrel distortions and pincushioning and other intractable of the optical path, and marry them to a different image plane.
This is precisely why companies create new mounts. It's the raison d'être of the optical market. Adapters are not a strength towards superlative IQ at value; they are a weakness.
people have made adapters out of soup cans and they "work". But are they a precisely engineered optic designed for a very specific focal plane with assured dimensions? No. The Q even switched sensor sizes!!! The GXR was designed as a modular system precisely because Ricoh argued you cannot make lines work with different sized sensors.
People tried 135 lenses on 110 and APS-C film systems..even with "approved adapters". None were ever satisfactory. Same for all the 645 adapters to 135 systems.
This is an ancient argument and the conclusion has ALWAYS been the same. For optical and value fidelity, adapters don't work. They make poor economic and engineering sense.
Last edited by Aristophanes; 08-13-2017 at 01:46 PM.