© Robert I. Sadler, 2011
Description, Notes & Specifications
| Manufactured: | 1964—1966 |
|---|---|
| Camera Mount: | M42x1 |
| Lens Elements / Groups: | 4 / 3 |
| Diaphragm Type: | pre-set |
| Diaphragm Blades: | 8 / octagonal |
| Angle of View: | 46° |
| Maximum Aperture: | f/4 |
| Minimum Aperture: | f/22 |
| Minimum Focus Distance: | 0·208 metres |
| Magnification Factor: | ≈1:1 |
| Filter Size: | ø 49 mm (screw) |
| Length: | 55 mm / 106·5 mm |
| Largest Diameter: | 60 mm |
| Weight: | ≈265 grams |
| Product Number: | 367 / 43670 |
| Serial Number Range: | — |
| My Serial Number: | 3057630 |
The Macro-Takumar 50mm f/4 is especially designed for macrophotography. When the helicoid ring of the Macro-Takumar is fully extended, you can shoot from life size to infinity without any close-up accessory. Use it in combination with extension tubes or bellows for larger than life size magnification.
The Macro-Takumar has a preset diaphragm. Unlike other preset diaphragm lenses, the preset ring of this lens is behind the diaphragm ring.
Distance engravings in yellow (metres) and blue (feet); special coloured engravings for image ratio and exposure compensation.
Use of the Macro-Takumar: First, open the aperture all the way, compose, and focus. Then read the magnification index. If it indicates 1·5, for instance, the image on the film is 2/3 as large as the real object. Find the corresponding exposure factor according to the colour of the index setting. In the above case, the 1·5 setting is orange, and therefore the factor (3x) must be used. In other words, the exposure time must be tripled, or the aperture opened one and one-half stops.
These exposure factors are irrelevant, however, when using the Spotmatic TTL meter, for it measures only the light entering the lens.
As a general rule in close-up and macrophotography, the aperture should be stopped down as far as possible because of the extremely shallow depth of field at such ranges. Exposure should be regulated with the shutter, but since it has no intermediate setting, it may be necessary at times to open the aperture somewhat. With the Macro-Takumar, set the preset ring to the desired aperture stop before releasing the shutter.
Review
Recommended: Yes!
References
- Asahi Pentax: Lenses & Accessories [63008]
- Asahi Pentax: Lenses & Accessories [06106]
- Asahi Pentax Spotmatic: Operating Manual [06046]
- Asahi Pentax: Takumar Interchangeable Lenses Operating Manual
- van Oosten, G. 1999. The Ultimate Asahi Pentax Screw Mount Guide. Uitgeverij Jansz.