Photographic Lenses
see also my notes:
online discussions:
online reviews:
using a tilt-shift macro lens:
online image examples:
Introduction:
But which lens to use?
What lens kits with image stabilisation to cover 14-400mm range in 35mm terms:
Astrophotography:
Testing lens resolution:
Group \ Pair | 1 | 2 | 3 | 4 | 5 | 6 |
-2 | 12 | 14 | 16 | 18 | 20 | 22 |
-1 | 25 | 28 | 31 | 35 | 40 | 45 |
0 | 50 | 56 | 63 | 71 | 79 | 89 |
1 | 100 | 112 | 126 | 141 | 159 | 178 |
- you can then determine lens resolution by multiplying your magnification factor by the triplet resolution in the table
- given your setup and methods are not likely to be the same as others, your calculations will not be comparable but they should be able to give you a good indication of relative resolution between your lenses.
- see my Olympus C8080 lens tests
- here are some of my examples with subject distance = 2.9m and using 100mm focal length lens (in 35mm terms) with values being for centre / top right corner (for simplicity I will use magnification factor of 29 for all, thus ignore the actual values - only use relative values):
100mm (in 35mm equiv.) f/1.4 f/2.8 f/5.6 f/8 Olympus C8080WZ N/A 2600/2600 at f/3.2 3000/2900 Olympus E330 + 14-45 kit lens N/A N/A 2600/2600 Olympus E330 + 50mm f/1.4 Zuiko OM 3200/3000 3200/3100 Olympus E330 + 50mm f/1.8 Zuiko OM 3200/1750 at f1.8 3200/2000 Olympus E330 + 50mm f/3.5 Zuiko OM macro N/A 3300/3300 at f3.5 here is the tiny cropped but non-resized top right corner, as you can see the triplets are clearly visible down to #2 of group 1 (you may need to save it and view at 200%)
3300/3300 3400/3300 Olympus E330 + 35-105mm Zuiko OM N/A 3100/3100 at f/3.5
- as you can see, the manual focus OM Zuiko lenses, even when at 2x crop on the E330, perform very well, much better than the budget kit lens, even wide open although the f/1.8 lens had problems at the corners which appears to be due to astigmatism.
- here are some of my examples with subject distance = 7.8m and using 270mm focal length lens (in 35mm terms) with values being for centre / top right corner (for simplicity I will use magnification factor of 29 for all):
270mm (in 35mm equiv.) f/1.4 f/2.8 f/5.6 f/8 Olympus E330 + 75-150mm Zuiko OM N/A 2300/2300 at f/4 2600/2600 Olympus E330 + Vivitar 135mm f/2.3 N/A 2300/2300 at f/2.3 2600/2300 3000/3000 Olympus E330 + Tamron 135mm f/2.8 N/A 2800/2800 2900/2900 2900/2900
- the 75-150mm OM was quite disappointing, while the Vivitar and Tamron did not seem to focus at infinity and all three appeared low in contrast - personally I would not recommend these on the Olympus E-series.
Lens mount adapters:
Kindai Japan - ~$US163
Cameraquest - ~$US175
Ebay search - Chinese-made adapters often available for $US20-45
a new EOS adapter with built-in computer chip for MF confirmation is coming
camera | mount | lens mount-to-film distances (mm) |
Olympus OM | OM bayonet | 46.0 |
Olympus digital (FourThirds) | Four Thirds bayonet | 38.67 |
Nikon F/Digital | bayonet | 46.5 |
Canon EOS (EF) | bayonet | 44.0 |
Canon FD | breech/bayonet | 42.0 |
Leica M | bayonet | 27.8 |
Leica LTM | screw | 28.8 |
Leica R | bayonet | 47.0 |
Pentax K | bayonet | 45.46 |
Pentax M42 | M42x1 thread screw | 45.46 |
T mount | M42x0.75 thread screw | 55.0 |
Minolta AF | bayonet | 44.5 |
Minolta MD | bayonet | 43.5 |
Contax/Yashica (eg. Carl Zeiss) | bayonet | 45.5 |
Contax RF | 34.85 |