Daer Tokm:
Then you could be happy by getting a better body
. I tried m42 and pentax M lenses on pentax K-7 and K-x for about 2 years. If you don't mind the step down metering then you'll be fine. Pentax lenses are not that cheap. You'll be surprised to see how much money people wanted for a legacy pentax A, F, FA, DA* lenses. Pentax forum is the best place for pentax stuff in the world. Again what I found is with pentax you'll be involved in heavy post processing with K-7 or maybe others as well. So you'll need to spend money on PS softwares and better PC and a larger monitor. What's more you'll need to spend less of your precious time to take pictures. You might need to struggle days and nights to get the right skin tone or something else but still failed in the end.
Some chips that I have been debugging with had been used by some of the high end DSLRs. Once I tried them I realized why. The high end DSLR did so much for you in hardware rather than software. First is the best sensor, then a better low pass filter. You get a clean raw file instantly from the camera not from the PS. And they can convert the raw to .jpg with smart algorithms to address dynamic range, skin tones etc. NC might not match some features that K-5 provide but the differences are there. I saw and convinced. The difference between pentax and NC are mostly in the understanding of the light spectrum and did it right for you most of the time. An example would be Pentax K10D and Nikon D200. They should share a similar CCD sensor that K10D with 2 data channels and D200 with 4 data channels. Generally people are happier with D200 not the K10D.
I still prefer usable "direct output from .jpg". A legacy lens would help me to get a cleaner picture instantly then with a cheaper lens and PS. I like to spend more time to enjoy the picture taking. I've been doing engineering works day in and day out so I try my best to buy the time for myself. It's not a lot of money at all to get a better tool
. If you enter LBA as many people did in the future then you'll understand me better
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All the best wishes to you!