I was wondering if you can do microscopic examination of things from a safe distance like 1 feet.
magnification : 1000x
safe distance from lens to sample: around 20~30 cm
The microscopic examination is about measuring the length in micrometer range on sample in an electric furnace. That is the reason that we want the long working distance microscope or such an equipment.
Or is it possible and safe to put an 100x objective lens into a furnace about 500C temperature? We have heard that normally objective lenses for high magnification (50x,100x) are coated with any materials.
Please feel free to let us know any idea or reply.
a free working distance of 1 foot with 1000 x magnification? Nope!
https://www.microscopyu.com/microscopy-basics/working-distance-and-parfocal-length
You might be happy with telecentric lenses and huge imaging sensor of fine resolution.
https://en.wikipedia.org/wiki/Telecentric_lens
https://www.edmundoptics.com/imaging-lenses/telecentric-lenses/
magnification : 1000x
safe distance from lens to sample: around 20~30 cm
It is not possible with the very short focal length objective lenses used on a normal microscope.
But you could use a high quality photographic macro lens with a focal length of 120 mm (e.g Mamiya), 150 mm or 180 mm (e.g. Sigma). At the 1:1 reproduction ratio for which they are optimally designed, this sets their working distance as twice their focal length, hence 24, 30 or 36 cm (in reality somewhat less, since the object plane is measured from a few cm inside the complex lens assembly).
The image plane behind the macro lens would then consist of a 1:1 replica of the object, safely extracted well outside the furnace. This "aerial image" could be magnified by a very short focal length eyepiece - as in a telescope. Since I cannot think of a source of sub-mm focal length eyepieces, the more likely method would be a combination such as a 5x telecentric amplifier (e.g. TeleVue Powermate) followed by a 2 mm eyepiece (e.g. Vixen).
Thank you for your answer Dr. Christian Senet and Dr. Ray Butler.
I saw the telecentric lenses information and was wordering if image that is passed through a telecentric lens could be magnified 1000x. " This "aerial image" could be magnified by a very short focal length eyepiece - as in a telescope." that I understood. It is possible to magnify an "aerial image" is passed through a telecentric lens. is it right?
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