Mostly I use my Pentax SMC-M primes 28mm/2.8, 50mm/1.7 and
135mm/3.5. I also have have Hoya 75-205mm/4 Zoom and Tamron-Popular
400mm/6.3 tele. I prefer primes because I can't afford good quality
zooms and they are usually also very heavy to carry in ones camera
back.
Also I like to use primes in backlight situations and when the
light source is in the picture area or near it (hood cannot prevent
strong light coming to front lens). Usually this isn't possible
with zooms and causes serious problems for most low quality primes
too.
| My lenses |
Pentax
28 mm |
Pentax
50 mm |
Pentax
135 mm |
Hoya
75-205 mm |
Tamron
400 mm |
| Serial number |
7729356 |
2989181 |
8047438 |
418383 |
73514 |
| Aperture |
| Maximum |
F/2.8 |
F/1.7 |
F/3.5 |
F/4 *1 |
F/6.3 |
| Minimum |
F/22 |
F/22 |
F/32 |
F/32 |
F/32 |
| Blades |
5 |
6 |
8 |
6 |
>10 *2 |
| Optics |
| Elements |
7 |
6 |
5 |
? |
? |
| Groups |
7 |
5 |
5 |
? |
? |
| Minimum focus distance |
30 cm |
45 cm |
150 cm |
180 cm *3 |
800 cm |
| Dimensions |
| Max diameter |
63 mm |
63 mm |
63 mm |
68 mm |
74 mm |
| Length |
31 mm |
31 mm |
66 mm |
147 mm |
340 mm |
| Weigth |
156 g |
185 g |
270 g |
700 g *4 |
670 g *4 |
| Filter size |
49 mm |
49 mm |
49 mm |
55 mm |
72 mm |
| Yoshihiko Takinami's Resolution Test Results |
| Average center |
80 lpm |
83 lpm |
58 lpm |
N/A |
N/A |
| Average corner |
64 lpm |
72 lpm |
48 lpm |
N/A |
N/A |
| Best aperture |
F/11 |
F/8 |
F/16 |
N/A |
N/A |
*1 Aperture is F4 for whole zoom range (75-205mm).
*2 The aperture "hole" seems to be round all the time cannot see how many blades there are.
*3 In Macro mode minimum focus distance varies between 35cm (@75mm) and 100cm (@205mm).
*4 Measured with kitchen scales.
Information for Pentax primes have been taken from Bojidar Dimitrov's Pentax K-Mount Equipment and from Yoshinoko's Photo Site.
Dimitrov's Pentax K-Mount Equipment
Yoshinoko's Photo Site
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