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Old Dec 18, 2007, 2:35 PM   #1
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Hey everyone, I am doing a project on optcial lenses for school and need some questions answered by somone other than myself. I thought Steve's would be a great place to seek answers. If you could give your opinion on the following questions it would be great.

1) What do you feel have been the most significant advancements in lens technology over the years?

2)What do you predict lens will be like in the future?

3)What is the difference between lenses found in point and shoot digital cameras and lenses made for DSLR cameras besides the their size?

Thanks a lot,
Shane
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Old Dec 18, 2007, 5:26 PM   #2
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photoshane wrote:
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1) What do you feel have been the most significant advancements in lens technology over the years?
  1. Advances in computer aided design and manufacturing. (i.e.: Aspherical lens elements)[/*]
  2. The use of non-glass andspecial glassoptical elements that have greater refractive properties. (i.e.: Low dispersion glass.)
photoshane wrote:
Quote:
2)What do you predict lens will be like in the future?
[/*]
  1. Lighter [/*]
  2. Less expensive.[/*]
photoshane wrote:
Quote:
3)What is the difference between lenses found in point and shoot digital cameras and lenses made for DSLR cameras besides the their size?
Because a lens in a typical P&S digicam can be closer to the image sensor, and the image sensor can be smaller, the lens designs can be simpler, and therefore, cheaper to manufacture. Lenses for SLRs (and, by extension, dSLRs) must make way for the mirror flipping up out of the way, so the image sensors must be larger, but also, the lens designsare much more complex, requiring more, larger and more complex optical elements.

How's that?

Anybody else?
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Old Dec 18, 2007, 11:02 PM   #3
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TCav wrote:
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How's that?
Pretty much sum it all!



Quote:
Anybody else?
With the advent of autofocus camera the zoom is now much simpler by adopting a varifocal design in which the focusing distance varies as the focal lenght is changed - With older manual focus camera such zoom design are a pain to use as most people would zoom in to ease the manual focus and then zoom out to compose, but then the distances are off
-> Parafocal zooms on the other hand are easier on manual focus as the focusing distance stays constant with the zooming change but are more complex in design hence also heavier...
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Old Dec 18, 2007, 11:45 PM   #4
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photoshane wrote:
Quote:

1) What do you feel have been the most significant advancements in lens technology over the years?
Quote:
Improved coatings and manufacturing techniques
Quote:

2)What do you predict lens will be like in the future?
Quote:
Lens elements will be piezioelectrically adjustable individually, allowing much greater focal length variations, in smaller, lighter housings.
Quote:

3)What is the difference between lenses found in point and shoot digital cameras and lenses made for DSLR cameras besides the their size?
Quote:
Better cost/quality ratio, as the fixed lens is optimized for its camera, and, not having to stand alone, can be made simpler.

brian
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