Best Internal Focus Lenses

Vortex Optics Razor UHD Binoculars 10x50

10x magnification and 50 mm lenses, provide ultra high definition optical quality and prescription for unparalleled image resolution, providing exceptional color fidelity, edge-to-edge sharpness, and light transmission..
Index-matched lenses correct color across the entire visual spectrum. Ultimate anti-reflective coatings on all air-to-glass surfaces provide maximum light transmission for peak clarity and the pinnacle of low-light performance..
Magnesium chasis brings increased strength and decreased weight.True open hinge design offers superior ergonomics while decreasing total weight and bulk. Rubber armor provides a secure, non-slip grip, and durable external protection..
A right-eye diopter tailors each barrels' focus to your eyes. The smooth, center focus wheel provides fine focus control and quick sharp views. Twist-up eyecups rest comfortably against the face and provide customized eye relief..
Argon purging and o-ring seals provide water & fogproof performance. Ultra-hard, scratch resistant armortek protects the lenses from scratches, oil, and dirt. Compatible with a tripod adapter, allowing use on a tripod or window mount..

18x magnification and 56 mm objective lenses, the Razor UHD binoculars provide ultra high definition optical quality and prescription for unparalleled image resolution, providing exceptional color fidelity, edge-to-edge sharpness, and light transmission..
Index-matched lenses correct color across the entire visual spectrum. Ultimate anti-reflective coatings on all air-to-glass surfaces provide maximum light transmission for peak clarity and the pinnacle of low-light performance..
Magensim chasis brings increased strength and decreased weight.True open hinge design offers superior ergonomics while decreasing total weight and bulk. Rubber armor provides a secure, non-slip grip, and durable external protection..
A right-eye diopter tailors each barrels' focus to your eyes. The smooth, center focus wheel provides fine focus control and quick sharp views. Twist-up eyecups rest comfortably against the face and provide customized eye relief..
Argon purging and o-ring seals provide a lifetime of water and fogproof performance. Ultra-hard, scratch resistant armortek protects the lenses....

10x magnification and 42 mm objective lenses, the Razor UHD binoculars provide ultra high definition optical quality and prescription for unparalleled image resolution, providing exceptional color fidelity, edge-to-edge sharpness, and light transmission..
Index-matched lenses correct color across the entire visual spectrum. Ultimate anti-reflective coatings on all air-to-glass surfaces provide maximum light transmission for peak clarity and the pinnacle of low-light performance..
Magensim chasis brings increased strength and decreased weight.True open hinge design offers superior ergonomics while decreasing total weight and bulk. Rubber armor provides a secure, non-slip grip, and durable external protection..
A right-eye diopter tailors each barrels' focus to your eyes. The smooth, center focus wheel provides fine focus control and quick sharp views. Twist-up eyecups rest comfortably against the face and provide customized eye relief..
Argon purging and o-ring seals provide a lifetime of water and fogproof performance. Ultra-hard, scratch resistant armortek protects the lenses from scratches, oil, and dirt. Compatible with a tripod adapter, allowing use on a tripod or car window mount..

Powerful Lenses: 10x magnification with multicoated lenses, roof prism for bright enhanced images, close focus distance of 8.2 ft, and 25mm lens....
Compact: The Aculon A30 is a lightweight (9.7 oz) portable binocular that is great for bird watching, spotting, travel, sports and more as it easy....
Ergonomic Design: A lightweight binocular that is comfortable to hold for long periods of use with eye relief of 10.6mm.
Central Focus: Fast and smooth range of focus allows for quick viewing when birding, hunting, and more.
What You Get: Aculon A30 10x25, Case, Neck Strap, Lens Caps, Nikon Lens Pen, and Lumintrail Micro-Fiber Cleaning Cloth.

Features: This 100mm lens can cover full-frame sensor size and focus from 2:1 magnification to infinity. The lens has a similar physical size to other 100mm Macro lenses in the market but its wider magnification range allows macro photographers to capture subjects of any size.
2:1 Magnification: Laowa 100mm f/2.8 2:1 Ultra-Macro is the second 2:1 Macro lens that we have (The first one is the 60mm f/2.8). The 100mm is one of the most common focal length for macro photography usage. All of the 100mm macro lenses in the market can only reproduce 1:1 magnification (life-size) image only. The extended 2x magnification means more details can be seen through the lens.
Apochromat APO Design (Invisible CA): The Laowa 100mm f/2.8 has an Apochromat (APO) design where the chromatic aberration (CA) at BOTH in-focus and out-of-focus areas (Longitudinal CA) is controlled to the minimal.
Outstanding Portrait Lens with Crystal Sharpness: Laowa 100mm f/2.8 2:1 Ultra Macro APO is not only an exceptionally macro lens. It can also focus to infinity and is a very decent telephoto portrait lens.

Professional photo and video: 20.3 Megapixel micro four thirds sensor with no low pass filter to capture sharp images with a high dynamic range and artifact free performance.
Splash or Freeze Proof Design: Freeze proof to 10 degrees the durable magnesium alloy body withstands heavy use in the field.
Splash or dust proof construction with weather sealing on every Joint, dial and button.
Dual image stabilization: 5 axis dual image stabilization corrects all lenses, including classic lenses not equipped with O. I. S, to eliminate Blur and nearly eliminate body and lens shake in both photo and 4K video recording.
4K video capture: Records silky smooth 4K 60P by 50P (QFHD 4K: 3840 x 2160.
MOV or MP4) video with internal 4: 2: 2 10 bit 4K video recording, Plus exclusive 6K photo and 4K post focus records photos up to 60Fps.
Connectivity and Ports: 3.5 millimeter audio port, connect to devices with USB 3.0, an external monitor or external Recorder with a full size HDMI port.
Available Twin SD card slots (UHS II U3 compatible).

Focal length: 12 to 40 millimeter, minimum focus distance 7.87 inches (20 centimeter ).
Dust proof, splash proof, and freeze proof construction. Lens construction: 14 elements in 9 groups (Aspherical ED lens, 2 Aspherical lenses, DSA lens, 2 ED lenses, HD lens, 2 HR lense).
Includes lens hood and pouch, filter size 62 millimeter, equipped with manual focus clutch mechanism.
Compatible with Olympus and Panasonic cameras.
Focal length: 12 to 40 millimeter, minimum focus distance 7.87 inches (20 centimeter).

Sigma Optimization Pro software in order to connect a photographers lens to their personal computer to update firmware and other parameters such as focus, and for the Sports category.
Compatible Lenses 35mm F1.4 DG HSM, 17-70mm F2.8-4 DC MACRO OS HSM / 17-70mm F2.8-4 DC MACRO HSM, and 120-300mm F2.8 DG OS HSM.
The adjustment is processed with special software (SIGMA Optimization Pro)..