Lets look on photo-objective lens attachment Opteka 10x High Definition II Professional Macro Lens. When it is added to photo-objective lens, it receives macro functions ( allows to make magnified photos of objects ) and its zoom is increased 10x times. It is attached to photo-lens via 52 or 46 mm thread, there is ability to attach 52 mm optical filters to it on frontal side. Wherein there are variations of this lens with different diameters : 55, 58, 62, 67, 72 and 77 mm. Attachment contains 4 lens elements, that are made of low-dispersion glass, all of them are coated with protective and anti-reflective multicoating. Its body is made of metal to increase its durability. It supports auto-focusing of objective lens and does not cause problems for infra-red shooting. There is need to note, that attachment’s lens elements has 40 mm diameter and on photo-lenses with large frontal glass it can obstruct part of scene; in this case there is need to reduce lens diaphragm, so that it will not produce image artifacts. Package contains : Opteka 10x High Definition II Professional Macro Lens attachment itself, frontal and rear caps, carrying and storage pouch and 5-years warranty card. In general, it is interesting solution, which costs much less, than specialized macro photo lens; but before its purchasing there is need to read in Internet information about how it works with given photo-lenses models. It has 4 lens elements and together with photo-lens this can produce large amount of optical surfaces, this increases light dispersion and internal reflections, so it is desirable, that base photo lens would have small amount of optical elements.
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