Sigma
Sigma 475-109 15mm f/2.8 EX Fisheye Lens for Pentax SLR
f/2.8
Unleash Creative Vision with a Unique Perspective The Sigma 15mm F2.8 EX Diagonal Fisheye Lens is designed for Pentax SLR cameras, offering a distinctive 180-degree field of view. This lens allows photographers to capture unique and creative perspectives, making it ideal for artistic and experim...
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Overview
Unleash Creative Vision with a Unique Perspective
The Sigma 15mm F2.8 EX Diagonal Fisheye Lens is designed for Pentax SLR cameras, offering a distinctive 180-degree field of view. This lens allows photographers to capture unique and creative perspectives, making it ideal for artistic and experimental photography.
Specifications:- Brand: Sigma
- Model: 475-109
- Focal Length: 15mm
- Maximum Aperture: f/2.8
- Mount: Pentax AF SLR
- Field of View: 180-degree diagonal
Key Features
Dedicated to Pentax AF SLR cameras
Full-frame fisheye autofocus lens
Allows for a variety of unusual compositions
Optical material used in this new lens are lead- and arsenic-free ecological glass
Accepts removable gelatin filters
Specifications
Focal Length
15mm
Aperture
f/2.8
Lens Type
Fisheye
Camera Mount
Pentax AF SLR
Filter Compatibility
Removable Gelatin Filters
Glass Type
Lead- and Arsenic-Free Ecological Glass
Pros & Cons
👍 Pros
- Designed specifically for Pentax AF SLR cameras, ensuring optimal compatibility and performance.
- A full-frame fisheye lens that allows for a unique, ultra-wide perspective and creative compositions.
- Features optical material that is lead- and arsenic-free ecological glass, reflecting environmental considerations.
- Capable of accepting removable gelatin filters, providing additional creative control over images.
- Offers a wide 15mm focal length with a bright f/2.8 aperture, suitable for low-light conditions and depth of field control.
👎 Cons
- As a fisheye lens, it produces significant barrel distortion, which may not be desirable for all photographic styles or subjects.
- The lens is dedicated to Pentax AF SLR cameras, limiting its direct compatibility with other camera systems.
- The description does not specify if the lens includes any weather sealing, which could be a concern for outdoor use.
- Autofocus speed or quietness is not detailed, which might be a factor for video recording or fast-moving subjects.
- The ability to use removable gelatin filters implies a non-standard filter thread or a rear filter slot, which might be less convenient than front-mounted filters.
Frequently Asked Questions
What is a full-frame fisheye lens, and how does it differ from other wide-angle lenses?
A full-frame fisheye lens, like the Sigma 15mm f/2.8, captures an extremely wide field of view, typically around 180 degrees, producing a characteristic barrel distortion that is used for artistic effect, unlike rectilinear wide-angle lenses that aim to keep lines straight.
Is this lens suitable for landscape photography?
While it offers an incredibly wide view, its fisheye distortion is a distinct aesthetic choice. For landscapes, it creates a unique, spherical perspective rather than a natural, undistorted view.
Does this Sigma lens have autofocus capabilities?
Yes, the Sigma 475-109 15mm f/2.8 EX Fisheye Lens is described as a full-frame fisheye autofocus lens, meaning it supports autofocus with compatible Pentax AF SLR cameras.
What are the environmental benefits of "lead- and arsenic-free ecological glass"?
The use of lead- and arsenic-free ecological glass indicates that the optical materials in this lens are manufactured with reduced hazardous substances, contributing to more environmentally friendly production practices.
How are the "removable gelatin filters" installed on this lens?
The mention of removable gelatin filters typically implies a slot at the rear of the lens, near the camera mount, where thin gelatin filters can be inserted to modify the light, rather than a traditional screw-in filter thread on the front.
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