Zeiss Biogon T* 21mm f2.8 ZM Lens for Leica M - Silver
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Full details
This guide is for photographers seeking an ultra-wide angle lens with exceptional optical quality for their MILC cameras, particularly those using the Leica M-mount. The Zeiss Biogon T* 21mm f2.8 ZM Silver Lens delivers outstanding resolving power, virtually no distortion, and superb contrast, making it ideal for reportage, landscapes, and architecture. A potential consideration is its manual focus operation and the availability of an optional viewfinder for precise composition.
All features
| Brand | Zeiss |
|---|
Extended Product Information
FAQs
What is the main advantage of the Biogon optical design?
The Biogon design is known for its symmetrical construction, which results in virtually distortion-free images and excellent performance at wide apertures.
Is this lens suitable for astrophotography?
With its fast f/2.8 aperture and excellent low-light performance, it can be suitable for capturing wide-field astrophotography, especially when combined with a camera capable of long exposures.
What does the 'T*' in T* Biogon mean?
The 'T*' signifies the ZEISS T* anti-reflective coating, which enhances light transmission and reduces internal reflections, minimizing flare and ghosting.
Can I use this lens on a Sony E-mount or Fuji X-mount camera?
Yes, adapters are available to mount Leica M-mount lenses onto cameras with Sony E-mount or Fuji X-mount (and other mirrorless systems), though infinity focus and full functionality may vary depending on the adapter.
What is the closest focusing distance?
The closest focusing distance for this lens is 0.5 meters (approximately 1.64 feet).
How do I clean the lens elements?
Use a soft lens brush to remove loose dust. For fingerprints or smudges, apply a small amount of lens cleaning fluid to a microfiber lens cloth and gently wipe the element in a circular motion.
Does this lens have autofocus?
No, the Zeiss Biogon T* 21mm f2.8 ZM Silver Lens is a manual focus lens. It is designed to be used with the camera's rangefinder focusing system or live view.
What is the filter size for this lens?
The lens accepts standard 46mm threaded filters.
Troubleshooting
Lens won't mount to camera.
Ensure the camera has a Leica M-mount and that the lens's rear mount is clean and free of debris. Verify you are aligning the lens correctly with the mount before twisting.
Soft or blurry images.
Confirm the lens is properly focused using the rangefinder or by manually checking the focus ring. Ensure the aperture is set appropriately for the lighting conditions.
Excessive flare or ghosting.
Check for strong light sources directly in front of the lens. Use the lens hood (if available/applicable) or consider repositioning your shot to minimize direct light. Ensure the T* coating is clean.
Focusing feels stiff or loose.
This may indicate a need for professional servicing. Contact the manufacturer or a qualified lens technician for inspection and repair.
Pros and Cons
Pros
- Exceptional image quality with high resolution and contrast.
- Minimal distortion for accurate geometric reproduction.
- Excellent flare and ghosting control due to T* coating.
- Robust build quality with a premium silver finish.
- Compact and lightweight design for portability.
- Precise manual focus with rangefinder coupling.
Cons
- Manual focus only, requiring user skill for precise focusing.
- An optional viewfinder may be needed for optimal wide-angle composition.
- May be more expensive than non-Zeiss alternatives.
- Requires specific Leica M-mount cameras.
Setup, Compatibility & Care Instructions
Setup: This lens is designed for cameras with a Leica M-mount. Simply align the lens with the camera's mount and twist clockwise until it locks into place.
Compatibility: Primarily compatible with Leica M-mount rangefinder cameras. When used on digital cameras with a crop factor (e.g., 1.3x), the effective focal length will change (e.g., 27mm on a 1.3x crop camera).
Filter Use: The lens features a standard 46mm filter thread. Screw filters gently onto the front of the lens.
Care: Keep the lens cap on when not in use. Clean the lens elements using a soft lens brush or microfiber cloth. For smudges, use a lens cleaning solution sparingly on a microfiber cloth. Avoid touching the glass elements with your fingers.
Storage: Store the lens in a dry, dust-free environment, ideally in a padded camera bag or its original box.