Originally posted by Ex Finn. The K-5IIs most certainly is a viable option (I am stating this w/o actually having one) v.s. trying to modify the K-5 classic.
edit: in the case you are wondering if the current models somehow have made it possible to revisit the filter removal, in the K-5 classic, then I would think the answer is no.
That is not what I stated.
What is stated now, which is constantly being ignored (or answered in a garbled fashion by the other) is that we don't know if in the previous, unsuccessful modification, if a neutral glass was placed over the sensor after removing the AA filter. For the most part, it appears the answer is none was replaced.
Now, supposedly, the K-5II, K-30, and K-01 use weaker filters. The IIs likely uses a neutral glass. This makes parts available to replace the K-5's filter with either a lighter one or a neutral glass and preserve function.
What the other person is going on about, I have no idea, from putting in a new sensor (when they're the same sensor) to you saying that somehow new models make it possible to remove an old model's filter somehow?
The last poster also inserted some assumption in there. When the filter was removed, it resulted in some sort of metering issues. There could be a better possibility that now the parts are available, we could have successful retrofitting, rather than plainly removing the AA.