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General| Mount | M42 Screw Mount |
|---|---|
| Focus Type | Manual Focus |
| Focal Length | Varies by model (e.g., 50mm, 135mm, etc.) |
| Aperture | Varies by model (e.g., f/1.4, f/2.8, etc.) |
| Format Compatibility | 35mm full frame |
| Minimum Aperture | Varies by model (e.g., f/16, f/22, etc.) |
| Lens Construction | Varies by model (number of elements/groups) |
| Angle of View | Varies by focal length |
| Minimum Focus Distance | Varies by model (e.g., 0.45m, 1.5m, etc.) |
| Filter Size | Varies by model (e.g., 49mm, 58mm, etc.) |
| Weight | Varies by model |
| Diaphragm Blades | Varies by model |
Principles for calculating exposure factors for macro photography without TTL metering.
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