Jump to content
Sign in to follow this  

Lens confusion

Recommended Posts

Hope someone can help me out on this one. I'm looking at buying a macro lens and in particular been looking at the Fantasea range. Here is where I get confused: what is the difference between a SharpEye lens and the UCL range?

Here are the specs on each:


UCL-05LF +6 Macro Lens

•Description: +6 diopter close-up lens

•Bezel Material: Hard anodized aluminum with black hard coating

•Lens Construction: 3 groups and 4 elements

•Lens Coating: AR multi layer coating

•Threads: 67mm (front and rear)

•Dimensions: 74 x 41.1 mm / 2.9 x 1.6 inch

•Weight: 254 g / 9 oz


SharpEye M67 +8

•Lens Construction: 2 groups, 2 elements

•Focal Length/Diopter: 125mm / +8 (Underwater)

•Features a 67mm thread mount

•Lens Coating: multi AR coating + water repellent coating (outer surface)

•Barrel Material: Aluminum with black anodize

•Weight: 135g

•Dimensions: Ø 72mm x 22.5mm (D)


All I can make out is the UCL is longer and heavier, but what get me is the construction specs. What does 2 groups, 2 elements vs. 3 groups, 4 elements mean to me as the user? Is the latter a better makeup of the lens though the SharpEye has higher magnification properties?

Any clarification will be appreciated.


Share this post

Link to post
Share on other sites

Elements refers to the number of glass elements or actual lenses (100% glass) making up the complex lens (multiple lenses, metal, etc.). Since lens elements are frequently glued together, a group of elements glued together is referred to as a group. For example a simple achromat lens can consist of two elements in one group - a number of long focus lenses made in the past were of this design such as the 400 and 560mm f/6.8 Telyts made by Leitz (company making Leicas before the name was changed).

Share this post

Link to post
Share on other sites
Sign in to follow this  



  • Create New...