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enhanced double concave πŸ” lens with optimum edges thickness logo

Enhanced Double Concave πŸ” Lens with Optimum Edges Thickness Review

3

Β·

Excellent

Revainrating 5 out of 5Β Β 
RatingΒ 
5.0
πŸ”­ Optics, 🧬 Science Education

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Description of Enhanced Double Concave πŸ” Lens with Optimum Edges Thickness

Double Concave Lens. 75mm Diameter. 20cm Focal Length. Sciencent High Quality Glass Lens.

Reviews

Global ratings 3
  • 5
    3
  • 4
    0
  • 3
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  • 2
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  • 1
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Type of review

Revainrating 5 out of 5

Good, but. small chips

It seems simple but I ordered 2 and both have at least 2 small chips around the edges. I hoped they could be naked and beautiful. Ruthless is still good.

Pros
  • Very good price
Cons
  • piggy bank price

Revainrating 5 out of 5

Foreverspin tops love it

I use this to spin my Foreverspin tops it's more concave than the first and the latest Foreverspin bases make them great for training stable spin they are great and i have ordered them many more for other rops.

Pros
  • Few competitors
Cons
  • are unreliable

Revainrating 5 out of 5

Perfect for spinning! (75mm at 50cm focal length is the PERFECT curve)

This is the perfect glass surface for spinning high power gyros. I recommend this particular lens because the curvature is the correct amount of curvature needed for a rotating surface. I was looking at an Eisco Labs double concave glass lens, 75mm with a 50cm focal length, and it was too "flat" to really matter for gyros. The shorter the focal length of a concave lens, the more curvature you have. Also, this lens is polished while other lenses I've seen are polished. So if you're looking for a

Pros
  • Great for me
Cons
  • No instructions