Owner`s manual

3.2. MORE ON PHOTOGRAPHING WITH M42/ MINOLTA AF LENS REDUCTION 18

3.2 More on photographing with M42 / Minolta AF lens reduction

[Author(s): Chingfeng Au. Reviewed by: Petr Holub.]

Part 1

This is just a fast test. All metering were segment metering (maybe I should use spot instead of segment)

http://auching.duc.auburn.edu/TEMP/pentax_minolta.htm

In F8.0 test, Pentax SMC Takumar under about 1.5 EV – 2.0 EV. But when I set the aparture to F1.4,

the shutter time seems near correct.

When using ﬂash, it works well though.

FIGURE 3.1: Results of M42 adapter tests (1)

Part 2

Here’s the test base on Minolta 50/1.7 and Pentax SMC Takumar 50/1.4. It looks like you have to +1EV

for F2.8 F5.6, +1.5EV for F8.0 F11.0, and +2EV for F16.0

http://auching.duc.auburn.edu/temp/m50p50.gif

Test using aparture priority mode. (I still don’t know why this happened? Theoretically, using aparture

priority mode and spot metering, the TTL system should get correct amount of light and calculate correct

shutter time, isn’t it?)

3.3 Alternative testing of vignetting

[Author(s): CyberSimian. Reviewed by: Petr Holub.]

This experiment was desribed for 24–105/3.5–4.5 lens in [3] with Hoya ﬁlter attached.

Try this experiment when there is no ﬁlm in the camera: