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Fresnel LensSheet

Now there is a plate and a few small screws. I unscrew them and again a bit surprisingly I could take out the front element easily.

These Limited Edition Fresnel lenses have been retired for many years. Though preowned, all are guaranteed to be in perfect condition with original box and Certificate of Authenticity unless otherwise specified.

I have not taken apart a lens before, so I am not sure how difficult it will be but I expect a reasonable challenge since a lens is a sensitive device and especially this old metal types are built to last.

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In a brightfield compound microscope, the coarse and fine focus knobs are used to adjust the focus of the specimen being viewed.

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I have always wondered how the camera lenses are made. You can always look at the lens diagrams but nothing beats actually taking apart and effectively destroying a lens.

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The tele-conversion lens increases the magnification of the lens, which enhances the telephoto effect. The wide-conversion lens increases the angle of the lens, ...

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In case you wonder, this experiment costed 32 CHF for the lens, 60-90 mins for the experiment, and another maybe 90 mins to write this post. I only used a watchmakers’s screwdriver set and a plier.

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So, three lens groups (four lens elements) are out until now. Two lens groups (each having one lens element) is left, and diaphragm is still inside this part as well. I am again stucked on what to do because there is nothing seems to be moving. I spend some time to loosen something, and I managed to take out the inside part here again by turning it circularly but after spending some time and effort to make it move. You can see I used a bit too much force on the shiny metal part.

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A bit surprisingly the last two lens elements now easily can be taken out, they actually fall on their own when I turn the lens upside down, since there is nothing left holding them in position.

Now I am at another dead end. The inside part again has no screws, and nothing seems to be moving. What to do then. I tried to get out the naming plate in the front.

As I do not have any clear idea on how to continue, I loose all the screws I can see and take out the rubber over the focusing ring thinking it might hide a screw but there is none under.

I have purchased a second hand manual lens, but still a serious lens from its era: Konica Hexanon AR 50mm F1.7. You can see more information at this site, but basically:

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At this point, it was becoming more challenging. I cannot see any screws to loosen, and no part is moving so I am not sure what to do. Naturally I think I need to turn some pieces in some circular motion. Then I realize there is a thread between the inside and outside pieces but I cannot turn them. Then I realized there is something (brownish) between the threads at some place, so I tried to take it out (by scraping it with a tiny screwdriver) thinking maybe it is some type of glue. After I did that, I could unscrew the inside part from the outside.

There is a mistake on what I said above, and I realized it also later that is why I wrote the mistake above on purpose. It was never clear to me when looking at the lens construction in the specs, it says X number of elements in Y number of groups. I understand some are grouped together but it was not totally clear. So I understood it now. The mistake is it is not the last two lens elements but last two lens groups. Because the last element is a single group, and the group before last actually contains two lens elements. I am not sure how it is made, but it is somehow made like a single piece of glass you can see below. It is also much thicker than the last element and others you will see later. I do not know if it is always like this, but you can also see in the lens diagram there is a space between groups 1-2-3 and 5-6, and this is actually where the diaphragm stays in this lens.

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This was a very nice experiment to see what is inside the lens. I know the current auto focus lenses also have circuit boards inside and I am sure they are more complicated and have more pieces. Also, the zoom lenses usually have more lens elements, for example, Fujinon XF16-55mm F2.8 has 17 elements in 12 groups.

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As I said I can directly see the diaphragm blades now. It has 6 of such blades and they seem to be made of thin, flexible metal. Because I also took out the piece that coordinates their movement (to be in-sync), now I can move them independently.

Finally, I can also take out one more lens group. However, I cannot get out the last lens element from the last shiny metal piece that houses it.

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