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Toric contact lenses are often the best choice for contact lens wearers with an astigmatism, because they're specifically designed to address the problem. The ...

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Jan 8, 2016 — A 50mm lens on a 36×24 sensor gives an angle of view of 47°. We often refer to it as a normal or standard lens because it has an angle of ...

by A Dyrda · Cited by 25 — Multifocal IOLs (MFIOLs) have different depth of focus capabilities within the optical zone and effectively achieve good visual acuity (VA) for ...

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The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by a lens ...

I shot these cows and pastures with the 24-105mm lens near the Susquehanna River.  I am not good at landscapes and these scenes looked really great before I snapped the shutter.  Oh well, gotta keep practicing and learning.

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These precision-polished axicons are offered with physical angles from 0.5° to 40°. These axicons are precisely manufactured from high-quality UV Fused Silica, ...

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Bored and wondering if I should see an analyst, I shot the stupid nest with the Canon lenses I had in my bag so you can see what each of them do for pulling in a shot.  I set each of my two zoom lenses at their extremes.  I suspect I was about 300 feet, line of sight, to the nest.  So, lenses and comments:

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Nothing announces your photography skills better than making an entrance with your big lens on full display.  The bigger the lens, the better the photographer.  But what does all this heavy glass really mean to you?  How much length do you really need to satisfy your drive to make art… or at least take a picture of those beautiful mountains and the valley below?  Here are some comparison shots I took with a few lenses I had in my bag the other day.

I was visiting a well known eagle nest early May along the Susquehanna River where three eaglets had just hatched a few weeks before.  As I pulled up along the road to view the nest, the one parent hanging out there saw me arrive.  What did he do?  Take off!  Get out of there!  This was a great opportunity to wreck my day.  So I set up my equipment anyway and waited for one of them to come back.  And I waited…. and I waited…. The dad finally did return for about a 5 minute rest so I grabbed a profile shot or two.

Align the text of an APA Style paper to the left margin. Leave the right margin uneven, or ragged. Do not use full justification for student papers or ...

by GE Liljegren · 1994 · Cited by 92 — The image is recorded from a first viewpoint and subject to a first distortion and played back from a second viewpoint and subject to a second ...

Regardless of your camera or sensor size, these pictures accurately depict the relative perspectives of different focal length lenses.  To understand what sensor size does to perspective, click here for my blog piece to see the difference.

We carry The BEST selling reading magnifiers in America! Specialize in low vision products for example: Magnifying Glass and reading magnifiers designed for ...