* Item pictured for illustrative purposes only, actual item not pictured. See ‘Notes’ next to grade for included items.
Komura 300mm f/6.3 Commercial Komura BT Copal 3 (60MT) 8x10 Lens
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Standard accessories included
Komura 300mm f/6.3 commercial large format glass for 8x10.
The Komura 300mm f/6.3 Commercial BT is built for 8x10 large format work, sitting in a Copal 3 shutter with a 60MT mount diameter. At 300mm on 8x10, you're working with a focal length that falls in the normal-to-slightly-long range for the format, making it a practical choice for field portraiture, architectural details, and copy work where a modest working distance matters. The f/6.3 maximum aperture is consistent with lenses designed to cover the full 8x10 format at acceptable corrections than chase speed.
The Copal 3 shutter is a, widely serviced leaf shutter standard, which means finding a technician to clean or calibrate it is not a problem. The "Commercial Komura BT" designation points to a design intended for studio and commercial applications where consistency and coverage take priority. For photographers already invested in 8x10 systems, a 300mm lens fills a specific and frequently used position in the kit.
Who It's For
Contact photographers and studio workers shooting 8x10 film will find the 300mm focal length sits comfortably in the normal range for the format, useful for product and portrait sessions where controlled perspective matters. Copy photographers or repro specialists benefit from the commercial-grade designation and Copal 3 shutter reliability. Large format field photographers building out a versatile kit gain a practical mid-range focal length. Anyone already using Copal 3 compatible boards gets straightforward integration with existing hardware.
Key Features
- 300mm fixed focal length for 8x10 large format
- f/6.3 maximum aperture for full-format coverage
- Copal 3 shutter with 60MT mount diameter
- Commercial Komura BT optical design
- Leaf shutter suitable for studio and field work
FAQ
- What focal length is 300mm on 8x10 film, and what kind of shooting does it suit?
- 300mm is normal-to-slightly-long for 8x10, giving you a working distance suitable for field portraiture, architectural details, and copy work without requiring extreme bellows extension.
- What is the Copal 3 shutter, and is it easy to service?
- The Copal 3 is a leaf shutter standard widely used in large format lenses. Finding a technician to clean or recalibrate it is straightforward since it's a well-supported design.
- Why f/6.3 instead of a faster aperture on an 8x10 lens?
- f/6.3 is typical for lenses designed to cover the full 8x10 format at acceptable optical corrections. Speed is subordinate to coverage and image quality at this format size.
- What does "Commercial Komura BT" indicate about this lens design?
- It signals a design intended for studio and commercial applications where consistency and full-format coverage take priority over other performance characteristics.
- Will this lens mount on standard large format cameras?
- Yes, the 60MT mount diameter with Copal 3 shutter is standard for 8x10 monorail and view cameras that accept copal-shuttered lenses.
- Is 300mm a normal lens for 8x10, or is it more specialized?
- It's a practical, frequently used focal length in 8x10 kits. It's not a wide or telephoto extreme, but a workhorse intermediate that handles most studio, field, and copy-work scenarios.
| Specification | Value |
|---|---|
| Focal Length | 300mm |
| Max Aperture | f/6.3 |
| Mount | Copal 3 (60MT) |
This description was generated using AI based on KEH's internal product standards, product expertise, and knowing what customers care about most. While we strive for accuracy, details may vary by individual item.
| Brand Name | Komura |
|---|---|
| Focus Type | Manual focus (only) |
| Max Focal Length | 300mm |
| Min Focal Length | 300mm |
Learn what to expect cosmetically from each grade. Images are representative and may not reflect the exact item. All gear is guaranteed functional unless noted. Accessories are typically not included unless listed. Like New through Bargain grades include a 180-day warranty. Items may also be available.
Exceptions
- New
- New in box complete with manufacturer's USA warranty. Not previously owned or used.
- Like New
- Essentially new with no signs of use. “Open box.” In manufacturer's packaging with original accessories and instructions. 180-day warranty.
- As Is
- Non-functional or damaged. Equipment will not work. Usable for parts. Not covered under KEH warranty and non-returnable.
Like New Minus
Like New Minus
Barely used with virtually no traces of wear. Only the closest inspections will reveal slight use. Lens glass could contain light dust or debris. Excellent picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Excellent Plus
Excellent Plus
Lightly used with limited signs of wear. Exceptionally nice but may have slight wear on finish visible. Lens glass could contain light dust or debris. Excellent picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Excellent
Excellent
Noticeably used with average signs of wear with the possibility of blemishes and/or minimal dings. Lens glass may have average dust and zoom/focus ring tension may have slight looseness or tightness overall, but will not affect picture quality. Accessories usually not included, unless noted in listing. 180-day warranty.
Bargain
Bargain
Heavily used with noticeable cosmetic and optical wear, but performance is mostly unaffected. May have dents, dings, or finish loss. Lens glass may have small scratches, dust, and blemishes, and zoom/focus ring tension may have moderate looseness or tightness overall. Accessories usually not included, unless noted in listing. 180-day warranty.
Ugly
Ugly
Heavily used with extensive visible wear. Equipment is rough, with multiple impressions in the finish, excessive finish loss and brassing. Glass will have marks, fungus and/or heavy/cloudy haze which could affect picture quality. Accessories usually not included, unless noted in listing. Not covered under KEH warranty.
