Some K, M and A-lenses on K-1

After the M 42 Takumar era was over in 1975, Pentax renamed their lenses Pentax SMC. (Super Multi Coating.) The new mount was called K-mount and has been the Pentax mount ever since, although improved with new electronic functions. Thus we are fortunate to be able to use all earlier lenses on today's DSLRs.

The K-lenses were made from '75 till the smaller M-cameras took over in '76. These smaller cameras needed smaller lenses, and the M-lenses were introduced. There were no technical differences.

The M-system reigned till 1983, when the fully automatic A-system, with automatic A-lenses, substituted the M-line. 

We will have look at some of those lenses. As one will see, all of the tested lenses are very good! 

A scale from 1-10 is used for sharpness. 
Very soft is used when points are <6
Soft is 6-6,5
Fair is 7
Good is 7,5-8
Very good is 8,5-9
Excellent is 9,5-10.

The very best lenses are marked with a 🤪, the very good ones with a😀, and the good lenses with a 🙂

Some K, M and A-lenses from 1975 and later

K 24/2,8:😀 Centre: Very good wide open. Excellent from 4.
             Corners: Soft wide open, fair at 4. Good at 5,6 and 8.

K 55/1,8: 😀Centre: Soft wide open. Good at 2,8. Very good to excellent from 4 to 8.
                   Corners: Soft at 1,8. Fair at 2,8. Good from 4 to 5,6. Touches very good at 8.

M 50/2: 😀 Centre: Good at 2. Tends to excellent at 2,8 and 4. Very good at 5,6 and 8.
                  Corners: Good from 2 to 4. Very good at 5,6 and 8.  

M 50/1,7:🤪 Centre: Good at 1,7. Very good from 2 and 2,8. Excellent from 4.

              Corners: Good at 1,7 and 2. Very good from 2,8 to 4. Excellent at 5,6 and 8. 

M 105/2,8: 😀 Centre: Good at 2,8. Very good at 4 and 5,6. Excellent at 8.
                      Corners: Very good wide open to 5,6. Excellent at 8.
                                  Tends to have sharper corners than the reference D FA 100/2,8!

M 200/4: 😀Centre: Good at 4, very good from 5,6, with a peak at 8. (Tested also at 11)
             Corners: Sharpness as good as in the centre!

M 75-150/4: 😀tested at 150mm:  Centre: Very good at 4. Touches excellent at 5,6 and 8.                    Very good at 11.
                 Corners: Very good from 4 to 11. A surprisingly good lens!

A 50/1,4: 😀Centre: Soft at 1,4 and 2. Good at 2,8. Excellent from 4.
             Corners: Fair at 1,4 and 2. Good at 2,8. Very good at 4. Excellent at 5,6 and 8.

A 28-80/3,5-4: 

 

Pentax SMC (K) 24/2,8
Pentax SMC M 50/1,7
SMC Pentax M 105/2,8

Skriv en kommentar: (Klikk her)

123hjemmeside.no
Antall tegn tilbake: 160
OK Sender...
Se alle kommentarer

| Svar

Nyeste kommentarer

29.09 | 19:44

Sorry, I misread your question, and my answer was about the Pentax K. The number of Pentar K was very, very low. Yes, 269$ seems a very low price.

...
29.09 | 10:10

Sorry, I misread your question, and my answer was about the Pentax K. The number of Pentar K was very, very low. Yes, 269$ seems a very low price.

...
28.09 | 15:31

Hi Bosse,

A near mint Asahi Pentar (yes Pentar) sold last month on ebay for £269. Were you aware of this? It seems like a very low price.

...
10.08 | 18:42

Hi Richard,
21.454 K models were produced between '58 and '59. But Pentax used the letter K for many other models, too. K-series in '75 and digital since 2006.

...
Du liker denne siden