Lenses are bad

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This topic contains 5 replies, has 6 voices, and was last updated by  Prabhatkumar 2 weeks, 2 days ago.

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  • #29248

    lreinhar
    Participant

    I had great fun putting my Deluxe Foldscope together, but neither lens is clear. Each lens has a black “amoeba-shaped” spot in middle of the field, and the rest of the field is “crazed”. Could the lenses have been damaged in the manufacturing process?

    I am giving four other Foldscopes as Christmas presents, and I am afraid that the kids will be as disappointed as I am.

    Can I get replacement lenses?

    I am open to suggestions for how to view objects with the Foldschope.

    Thanks.

    • This topic was modified 9 months, 1 week ago by  lreinhar.
    #29771

    Anonymous

    Hi Ireinhar,

    I’m sorry to read that your foldscope’s lenses are dirty. Have you tried to clean them up with the cotton swab ?

    What about the other foldscopes ?

    #30000

    Chuck Young
    Participant

    I am having a similar problem with lenses. I find that the focusing wedge is useless; the lens must be VERY close to the slide for focusing, closer than can be achieved with the focusing wedge in place.
    I found an alternate way to check lens performance without assembling the entire foldscope;
    see my note below. I checked the lenses on 2 classroom sets (40 lenses total).
    My suspicion is that there is a problem with the production run of the lens mounts.
    I doubt that (at this price) anyone tested the individual lenses.

    I am also finding that the slots for the slides in the foldscope are not long enough. I had to lengthen the slots with an exacto knife.

    Chuck Young

    *I will describe my attempts to check my two boxes of Basic Classroom FoldScopes.
    I think my procedure is quite simple.
    My light source is the overhead lamp in our dining room. I redirect the light by placing a hand mirror one the table so the light from overhead lamp is in my eyes.
    I am using:
    one of the fern rhizome prepared sample slides, and
    one of the magnetic coupler washers and
    one lens in its black holder.
    I also have a package of blank microscope slides with cover slips.

    I place a magnetic coupler washer on the table, black side up.
    I place the prepared slide on the magnetic coupler washer, label and sample side up. I center the sample over the hole in the magnetic coupler washer.
    I place the lens on the slide, silver side down. So, I have a sandwich of magnetic coupler, prepared slide and lens The magnets hold the sandwich together.
    I hold the sandwich up to the light, and hold it close to my eye. Sometimes I have to readjust the sandwich to center the sample on the lens. I can see the cells of the sample. For some of the lenses, the focus is good. In this particular lens,
    the focus is kind of poor. I can improve the focus by prying the lens away from the slide OR by adding one or two cover slips between the lens and the microscope slide.

    I tested all 40 of the lenses on my classroom FoldScopes. Three or four of them gave the best images; very much in focus, good contrast, etc. Most gave reasonably good images that could be improved using the cover slips. A couple of them gave images that were out of focus and couldn’t be improved with the slide cover slips.

    #57740

    Rpvvshalimarbagh
    Participant

    WE IN OUR SCHOOL RECIEVED 30 FOLDSCOPES AND ALL OF THEM HAVE THE SAME PROBLEM. NONE OF THEM IS CLEAR. YES WE TRIED TO CLEAN THE LENSES BUT IS OF NO USE

    #59947

    donnacnh
    Participant

    I had this problem too, but then I looked closer at my foldscope and it had an extra magnetic coupler attached to the lens piece, once I took off the extra coupler the lens was clear since now it was closer to the slide and I could see everything easily.

    Also, check to be sure that your slide is in properly, the slipcover should be down and closest to the lens, otherwise you are looking through the slide to the item and it appears to be unclean.

    If you have not looked at the tutorial videos, I suggest that you do, I tried to just use the instruction book, but found the tutorials to be much more helpful.

    Happy discovery!!

    #61156

    Prabhatkumar
    Participant

    My foldscope has too bubble like light spots.
    How can I get to clear images???

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