INON UCL 90 XD Underwater Macro Lens for Scuba Diving & Snorkeling - High-Quality Close-Up Photography of Marine Life, Coral Reefs & Small Aquatic Creatures

XD Mount for one-touch lens attachment and removal
The newly developed XD Mount enables one-touch lens attachment and removal. The XD Mount on a lens provides high durability, thin design without compromising lens optical performance and speedy lens attachment/removal in combination with XD Mount on housing side which has reasonable price and anti-slip lock function.

Features
A close-up lens designed to provide comfortable high magnification and longer working distance to fill light easily. Exclusively designed for underwater use to strive high image quality and using HR lens attains significantly compact lens body. The UCL-90 widely supports from a macro lens for full frame SLR system to a compact digital camera.

Compatible Lens

A telephoto macro lens with a minimum focus distance longer than 20cm is recommended (*1)(*2)
Using short minimum focus distance lenses will reduce the magnification.

(*1) Vignetting may be observed depends on the distance between master lens and lens port glass and/or UCL-90 and lens port glass.
(*2) Only usable when the focal length is between 60mm and 100mm range at 35mm film equivalent. Beyond this range, there will be vignetting at the wide side and deteriorated image quality at the telephoto side.

Powerful magnification with focal length 90mm (+11 diopter).
The maximum magnification when using this lens with 100mm range macro lens for a full frame SLR system is x2.23 (area ratio x4.98) (*3) which delivers middle power in between "/" (+15 diopter) and "/" (+6 diopter).

(*3) When using for AF-S VR Micro-Nikkor 105mm f/2.8G IF-ED.

 While the UCL-90 delivers high magnification, it still offers long working distance. When using with 100mm range macro lens for SLR, working distance is 52mm (83.4mm from housing port surface) at minimum focusing distance (*3).
Together with its compact size, the lens supports friendly lighting even at minimum focusing distance.

Sample images

Using HR glass makes lens size compact supporting wide range of camera system from 100mm range macro lens for SLR to compact digital camera (*2). Also compact lens body has less limitation of lighting enabling you to use wide variety of lighting techniques.
 
The lens is consists of 3 elements in 2 groups and effectively suppresses chromatic aberration by using achromat lens inside. Also anti-reflection coating on all lens surfaces suppresses flare/ghosting.
 
Optional is attached on the front end of the UCL-90 lens barrel allowing to stack INON M67 series,  /   to support even higher magnification for super macro imaging needs. (*4)

(*4) Other higher magnification close-up lens, , and UCL-100M67 are not usable as those combinations will have significantly degrade image quality.

Specifications

*Specification is subject to change without prior notice
**Focal length of lens itself and not combined focal length with camera's master lens.
***With AF-S VR Micro-Nikkor 105mm f/2.8G IF-ED at the minimum focusing distance.

Usage Notice

*Depending on housing, shooting distance, angle of view etc., the lens may block the built-in flash light from illuminating the entire image. In such cases it is recommended to shoot with an external strobe or flashlight.

*A close-up lens provides maximum magnification at zoom telephoto end.

*Generally, a close-up lens shortens the camera’s close focusing distance. With this product, you can place your camera closer to a subject, achieving a larger image. On the other hand, depending on zoom or aperture setting, it may be more difficult to obtain complete depth of field on a distant subject.

*Stacking multiple lenses may cause vignetting at zoom wide end. As you stack more lens, focusing distance gets short and depth of field gets shallow as well.