What kind of lens bends an image without distortion?

8 months 3 weeks ago #711074 by johnywhy
Is there a lens which can allow the observer to view something that's off at an angle? Ie, a lens which deviates the image by an angle, without magnification. Would it be a simple trapezoid, with flat faces? Is that available off the shelf?


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8 months 3 weeks ago #711188 by db3348
Johny ,

Not sure if I'm interpreting your question properly ,  but the very notion of bending an image ,  and "deviating the image by an angle "  to me  implies  distortion .
And all lenses  will distort a subject to some degree  (without some optical correction)  if  subject is viewed and  taken from an angle  to the surface planes of the subject .
For example ,  if  you  view or photograph  a square or rectangular shape  from an angle ,  by default  that shape will be rendered as a trapezoid shape in the resulting photo ,  which basically constitutes  distortion of the subject .

Perhaps  you  have seen an image  which you could post a link to or a copy of  to the forum so we can see what you are suggesting .


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8 months 3 weeks ago #711189 by johnywhy
I think i misled by the word "lens". I don't care if reflective, refractive, inductive, or hyperactive 

 
 
To be more specific about my use-case:
 
If my camera position is fixed and unchangeable, but it's not pointing directly at my subject, then i want a simple adjustable optical piece that i can manually tilt in order to redirect the off-access image into the camera. It would likely be less than 45 degrees, with a relatively small adjustable range, say +-20 degrees.
 
i'm thinking something like a pentaprism would be the simplest solution. But, the image might be reverse or upside-down, so it's a matter of figuring out the correct polygon of the prism to ensure that the camera sees a correctly-oriented image. i'm wondering if a simple trapezoid would do. It might need to be a double trap, to correct the inversion.
 
img\def

 
Or, why not just a rectangular prism? Just a simple rectangular block of glass?
 
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Or a short length of straight light pipe?


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8 months 3 weeks ago #711200 by Nikon Shooter

db3348 wrote: … the very notion of bending an image ,  and "deviating the image by an angle "  to me  implies  distortion.


:agree: :agree: :agree:

Light is free… capturing it is not!
This person is a posting maniac and deserves a #1 badge!Top Poster
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8 months 3 weeks ago #711319 by db3348

Johnywhy wrote :  ... a simple adjustable optical piece that i can manually tilt in order to redirect...

OK got it .   Your suggestion does have some merit .  Have  you considered gutting  the inside of an old SLR camera  and salvaging the pentaprism and mirror assemblies ?   Could need  a bit of fiddling ,  with construction , positioning and angles etc .
Just a suggestion .


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7 months 3 weeks ago #713545 by johnywhy
i wonder if a Ludor lens could do this. People are usually interested in Ludor's as "invisibility shield", but doesn't it simply bend light?


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7 months 3 weeks ago #713556 by db3348
Sorry,  not familiar with the Ludor


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7 months 3 weeks ago #713573 by johnywhy
oops, Lubor


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