Made from Water White glass with anti-reflective (AR) coating on both front and rear surfaces; reduces light loss and flare and ensures proper color, contrast and overall image sharpness.
Screw-on versions are supplied with brass mounting rings while drop-ins feature anodized aluminum rings
These lenses can be used individually or in any combination to achieve ultra-close focus.
The maximum magnification achieved with these attachments will depend on the focal length of your lens as well as the actual close focusing capability of that particular lens.
A +1 close-up lens will allow you to focus your lens somewhat closer than it already does; A +2 close-up lens will allow you to focus closer than the +1; A +4 lens will allow you to focus even closer than a +2
A +1 combined with a +2 will equal a +3, while a +2 combined with a +4 will equal a +6, and so on