High magnification lens

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This topic contains 6 replies, has 3 voices, and was last updated by  Soccermom2 2 years, 8 months ago.

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  • #516

    Soccermom2
    Participant

    Hello! We received our Foldscope yesterday and have been exploring the world around us. We were able to focus on my iPhone using the low magnification lens and take some “okay” pictures, enough to make us scream with joy. However, we are struggling with the high magnification lens. We made sure to followed the instructions in the video, but aren’t able to display anything in our field of vision. The high magnification lens are lined up properly with the holes. Any ideas on what we are doing wrong? I have tried with my phone and without my phone. We are able to see a little bit of light when we look at the lens holder, but close up the background is black with a small hole displaying light.

    #583

    Manu Prakash
    Participant

    That is quiet puzzling.. Before trying any coupling with the cellphone; the microscope should work by itself (both in high mag and low mag settings). So, once you have assembled the high mag (just like described in the video); try to just directly image through the same. Here are a few things I can suggest:
    a) First make a slide that does not have a very thick cover slip. As the magnification of the lens increases, the back-focal length decreases, so it’s possible with a very “thick” cover slip – you might not be able to focus. Try with a normal cover slip or tape slides.
    b) Test with and without the condenser lens, if your light sources are lined up. The one step that requires using double sided tape to mount the LED; may sometime lead to mis-alignment. For low mag, it’s not too big a deal – but with high mag, you need good alignment. Simple test for the same is to just align the light source independently first.
    c) Every lens in the system has an orientation (up or down).. so the high mag lens also has a little bump on one side. This plastic bump should be facing towards your eye (which has a smaller aperture) – as compared to the flat side should be facing the sample. Please double check with orientation you mounted the same.

    Finally, the whole fun of this process is to really play to learn so you really understand why something works and why it does not. Take some pictures of what you can see and post them and I will try to debug the same. But my hunch is that it’s number (c) where the problem lies.

    Post some pictures of your setup, with answers to above questions – and we can try to debug the same.

    Happy holidays..

    cheers
    manu

    #1320

    Soccermom2
    Participant

    I’m still working on this. I have tried all the suggestions and I fully appreciate your response. I am going to start this again, as I know sometimes the first time doesn’t always works. So, with trial and error I will deligently keep trying. My 9 year old son and I are having a blast. My husband is a diabetic and my son immediately wanted a sample. We view the specimen after collection and a couple weeks after the specimen dried. I haven’t gotten any view in high resolution, but the images I did receive were top notch!!!

    #1477

    Soccermom2
    Participant

    How do I know if my high magnification lens is dysfunctional? I am not able to get any images in the lens and I have done all the recommendations. We are really enjoying the low magnification though. This is so awesome. The only thing I can see that would be a problem is when we change out the lens, the wear will eventually keep the lens from popping into place.

    I would be more than happy to pay for a new high magnification lens if that is an option. My 9 year old and I are exploring as many things as possible and would love to post some more information on this site. Thank you!!!

    #2530

    klsywd
    Participant

    I’m having some problems with the high mag lens too.

    At first it didn’t work because my LED wasn’t aligned properly. Once I got that sorted out it worked great! …for a while. After switching from paper to a glass slide I can’t get it to go back into focus. What can I do to adjust or reset the alignment so that it is in focus?

    Also I had to tape the condenser lens on, after putting it in and removing a couple of times it no longer clicks into the hole. I don’t imagine that this would affect the focus though.

    #3520

    Manu Prakash
    Participant

    @Soccermom: I forgot to mention the simplest possible test. If you hold the high mag lens in your hand and look through the whole; you should not see anything (ie. no clear image of object behind the hole). If you do see a clear image of the objects behind; that means that the high mag lens fell off the tiny seat it was sitting in. Can you confirm if that is not the case..

    cheers
    manu

    #3582

    Soccermom2
    Participant

    Hi Manu!

    Sorry, for the late response. I think we have a winner. I think the high resolution lens fell off the seat it was on. This explains why I am unable to see anything from the high resolution lens. I can see clear images behind the hole. We are still enjoying the low power resolution. Now, that spring is here we are ready to explore everything in sight. My son is interested in pond water and I can’t wait to see what lies beneath the pond scum.

    • This reply was modified 2 years, 8 months ago by  Soccermom2.
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