I have three old shots of pk bayonets. What are the disadvantages of using it on the current digital SLR? There is also whether the adapter ring has any effect on imaging.

The old lens of 1 and pk port can be directly connected to Pentax digital SLR without adapter ring, and you can also choose the exposure mode of AV file (aperture priority). SLR of Canon, Nikon, Sony and other brands need adapter ring, and exposure can only use M-file (full manual). The adapter ring has no effect on imaging, but it is inconvenient to assemble and disassemble the lens.

2. As for the imaging quality of the old lens, there are different opinions on whether there is a problem of resolution degradation on the digital SLR, but many photographers like to cover the old lens with SLR, especially the famous lens of Zeiss Leica, and its film effect is really extraordinary. Of course, the problems of anti-glare and backlight mentioned upstairs do exist. In fact, even if the automatic lens is backlit, there is glare.

Don't worry, you won't need it. I have three old lenses that I often use.