ohp question
- Thread starter apple crusher
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i really don't know more than you already do. What I do know is three lense setup OHP is alway better for some reason. I might have read it somewhere (or might just have imagined 
) that three lense provide a better focusing and sharper image. One thing is definite for sure though, the three lense setup cost more than a one lense setup, that must accountable for somthing.
Is there anyone out there that can be more informative? I know i really don't a lousy job explaining here .
) that three lense provide a better focusing and sharper image. One thing is definite for sure though, the three lense setup cost more than a one lense setup, that must accountable for somthing. Is there anyone out there that can be more informative? I know i really don't a lousy job explaining here
.The reason is that the distortion a lens introduces is related to its curvature and aperture.
For a single lens doing the same amount of work as three other lenses, the curvature of the single lens is significantly higher for the same aperture, and the distortion introduced (spherical abberation) is much greater.
Plus, the multiple lens setups may also be corrected for chromatic abberation by using lens elements with different refractive index properties.
Overall, with all else being equal, you generally get better quality from a three-lens setup.
Bill.
For a single lens doing the same amount of work as three other lenses, the curvature of the single lens is significantly higher for the same aperture, and the distortion introduced (spherical abberation) is much greater.
Plus, the multiple lens setups may also be corrected for chromatic abberation by using lens elements with different refractive index properties.
Overall, with all else being equal, you generally get better quality from a three-lens setup.
Bill.
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