Is the manual lens easy to use? What focal length is the most practical? Which one is suitable for Pentax (cheaper, acceptable picture quality)?

Manual lenses used in digital cameras can be roughly divided into two types:

One is a lens that can link the aperture and support automatic metering. Using this lens is equivalent to using an automatic lens and then adjusting to manual focus. Just adjust the focal length and focus, and leave the rest to the fuselage, which is more convenient. The original Pentax lens should start with an A, such as A50/ 1.7. In addition, the manual pan/tilt produced by domestic Phoenix and Shenyang Zhong Yi also supports automatic metering.

The other is that it does not support aperture linkage. When using, not only do you need to manually zoom and focus, but you also need to adjust the shutter and twist the aperture ring according to your own experience to form an exposure combination. It considers a lot of things, almost manually. The original models of these lenses in Pentax are M and K, such as M50/ 1.7. But Pentax's machine has a green button with metering function. When the user uses the manual head, he can make the machine meter glow by pressing the green button. For the original head, metering is quite accurate. In addition, it is necessary to measure the light manually to transfer other brands of lenses and old lenses through the adapter ring, such as Russian and Cai Dong. Moreover, if you want to use the green key to measure light at this time, because the lens is different, it may lead to inaccurate measurement, so you still have to rely on the photographer's experience to measure light (do you know the power of photographers 30 years ago? )。

Pentax users have a lot to choose from when they buy. It is recommended to go to the photography forum to see the posts of netizens, such as Hummingbird. It is a good choice to have a colorful shadow. Ask the manual head over there, and the netizen's answer there will be much sharper than this one.

If you want to recommend manual head, I recommend you to use head A first. In the A header, A50 has a relatively high cycle rate and good image quality and color performance. A good color A50/1.7 is around 800 yuan, and A50/2.0 550 around 550 yuan.