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MTO-11CA 1000mm f/10 MC Mirror Reflex Lens

The LZOS 11CA is a 1000mm f/10 lens designed for T-Mount mount cameras. Check GearFocus for current availability, with buyer protection on every purchase.

MTO-11CA 1000mm f/10 MC Mirror Reflex Lens

MTO-11CA 1000mm f/10 MC Mirror Reflex Lens

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Lens Overview — LZOS 11CA

The LZOS MTO-11CA is a 1000mm f/10 prime mirror reflex lens designed for full-frame DSLR systems, mounted via the T-Mount standard for broad camera compatibility. As a catadioptric (mirror reflex) optical design, it achieves an extreme super-telephoto focal length of 1000mm in a package weighing 1900g — a notable characteristic of the mirror reflex construction, which folds the optical path to reduce physical length compared to conventional refractive designs of equivalent focal length. The maximum aperture is f/10, which is typical of mirror telephoto lenses and reflects the trade-offs inherent to this optical approach.

Focus is entirely manual, with no autofocus system present, which places full control and responsibility on the shooter. Image stabilization is not included. The filter thread measures 105mm, accommodating large-diameter filters suited to the lens's substantial front element.

Designed for full-frame coverage, this lens is built to illuminate the entire 35mm sensor area. The T-Mount interface means adapters are widely available for attaching it to a range of DSLR camera bodies, giving it a degree of cross-system flexibility. This lens suits dedicated manual-focus shooters working at extreme telephoto distances.

Key Features — LZOS 11CA

1000mm Catadioptric Design: Mirror reflex (catadioptric) optical construction folds the light path to achieve 1000mm focal length in a more compact and lighter body than an equivalent refractive telephoto lens.

Full-Frame Coverage: Designed to fully illuminate a 35mm sensor, making it compatible with full-frame DSLR bodies without vignetting.

T-Mount Interface: Universal T-Mount thread allows the lens to be adapted to a wide range of DSLR camera systems using inexpensive, readily available adapters.

f/10 Fixed Aperture: The mirror reflex design produces a fixed f/10 aperture, meaning exposure is controlled via shutter speed and ISO rather than an iris diaphragm.

Donut Bokeh Rendering: The secondary mirror obstruction inherent to catadioptric lenses produces distinctive ring-shaped (donut) bokeh in out-of-focus areas.

Manual Focus Only: No autofocus system is present, requiring the shooter to focus entirely by hand — well-suited to static or predictable subjects at extreme distances.

Lens Specifications — LZOS 11CA

LZOS 11CA full specifications
SpecDetail
Use CasesWildlife, Astrophotography, Sports
Lens TypeSuper Telephoto
FormatFull Frame
Zoom/PrimePrime
Focal Length1000mm
Maximum Aperturef/10
Camera SystemDSLR
Lens MountT-Mount
AutofocusNo
Focus TypeManual
Image StabilizationNone
Filter Thread105mm

Description — LZOS 11CA

The LZOS MTO-11CA is a 1000mm f/10 prime mirror reflex lens built for full-frame DSLR systems. Operating at a super telephoto focal length with a fixed f/10 maximum aperture, this lens is a dedicated tool for extreme long-distance photography. Focus is manual only — there is no autofocus — so shooting with this lens demands steady hands, a reliable support system, and careful attention to focus technique.

The lens attaches via a T-Mount interface, which provides cross-system flexibility when paired with the appropriate body adapter. At 1900g, it is a substantial piece of glass that benefits from tripod support during use. The 105mm filter thread accommodates large-format filters.

With no image stabilization on board, achieving sharp images at this focal length is entirely dependent on the shooter's technique and support setup. Designed specifically as a prime lens, there is no zoom range — 1000mm is the sole focal length offered.

Pros — LZOS 11CA

  • ✓Extreme 1000mm focal length (minFocalLength/maxFocalLength) enables shooting at very long distances
  • ✓Full-frame coverage (lensFormat) ensures the image circle covers the entire sensor without vignetting
  • ✓T-Mount interface (mount.lens) allows broad adapter-based compatibility across multiple DSLR systems

Cons — LZOS 11CA

  • ✗Manual focus only (autoFocus: false) — no autofocus assistance, demanding precise technique at 1000mm
  • ✗f/10 maximum aperture (maximumAperture) is relatively slow, limiting use in lower light conditions
  • ✗No image stabilization (imageStabilization: None) makes handholding at 1000mm extremely challenging

Videos — LZOS 11CA

Weird lens reviews: MTO 1000A 1,100mm f/10.5 mirror lens with samples — Christopher Frost

Resources & Downloads — LZOS 11CA

Manuals & Guides

Frequently Asked Questions — LZOS 11CA

What camera bodies is this lens compatible with?+
The MTO-11CA uses a T-Mount (mount.lens), which is a universal adapter-based system. This means it can be attached to a wide variety of DSLR camera bodies using the appropriate T-Mount adapter for your specific camera brand. The lens is categorized as a DSLR-compatible lens (cameraSystem).
Does this lens support autofocus?+
No. The MTO-11CA is a manual focus only lens (autoFocus: false, focusType: Manual). There is no autofocus motor or electronic coupling for AF. Shooters must focus entirely by hand, which at 1000mm requires care and ideally a stable support system.
What is the filter thread size on this lens?+
The filter thread diameter is 105mm (filterThreadSize). This is a large diameter, so compatible filters may be more expensive or harder to find than those for smaller consumer lenses. Be sure to source 105mm-threaded filters for use with this lens.
Does it include any image stabilization?+
No, image stabilization is listed as None (imageStabilization). Given the 1000mm focal length and 1900g weight, use of a solid tripod and head is strongly recommended to achieve sharp results.
Will this lens cover a full-frame sensor?+
Yes. The lens format is specified as Full Frame (lensFormat), meaning the image circle is designed to cover the full 35mm sensor area without vignetting on compatible full-frame bodies.
How heavy is the MTO-11CA?+
The lens weighs 1900g (weight.value in grams). This substantial weight reflects the large optical elements required for the 1000mm focal length and should be factored into your support equipment choices.