What type of lens is in a film/slide viewer?

Discussion in 'Darkroom Equipment' started by jsmoove, Dec 7, 2018.

  1. jsmoove

    jsmoove Member
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    Also another question I have is, can you get a film slide viewer but at 10x?
    For possibly viewing things like microfilm.
     
  2. jjphoto

    jjphoto Member
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    Are you talking about a loupe? I have a x10 loupe which I use for film , i don't see what you can't still get them. Maybe try ebay .
     
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    jsmoove

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    @jjphoto I guess so yeah...I mean one where you can slide the film in the back like a slide viewer, not just place ontop. Are loupes and slide viewers plano-convex lenses?
     
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    jsmoove

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  5. AgX

    AgX Member

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    The classic loupe has a bi-convex lens. Basic slide viewers got either a bi-convex or plano-convex lens.

    The cheapest high-quality lens is a twisted 50mm standard lens.

    I got two microfilm readers, but those for fiches, though one could put a 35m strip in them too
    If you got a 35mm microfilms an improvised solution might be a 35mm slide projector with film strip attachment.
     
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    jsmoove

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    @AgX Sweet thanks, that's helpful info for me. The above link to the Carson macro lens, is that biconvex too?
     
  7. jim10219

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    Hard to say without a better picture. My guess is yes. Biconvex lenses work best when the lens lies about in the middle between the image to the object. In other words, close up and macro work. Plano-convex work better when the object is a lot further (more than 5x) out from the image. In other words, telephoto or infinity focus work. But that's just according to basic lens theory. They could be compound lenses (more than one lens element), or they could have just thrown together whatever they could find cheaply, and designed the item to sell lenses, rather than designing the lens to sell items.
     
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    jsmoove

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    @jim10219 Cool thanks...I guess I could just buy one and pop it out to find out myself what type it is.
     
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    jsmoove

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    I know this is a little off the original subject, but do you think it is possible to 3d print a lens like the carson one?
    Using some sort of optically clear PLA filament?
     
  10. AgX

    AgX Member

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    Filament printing still would necessitate turning the surface into a smooth curvature of right dimension.
     
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