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Thread: Magnifying glass on a SLR

  1. #1

    Magnifying glass on a SLR

    Recently I played around a little bit with simple lenses mounted on a SLR using a body cap and macro bellows. First the setup using the convex lens of a cheap magnifiying glass and a Cokin filter holder as lens board and aperture holder.





    And a few sample pictures.

    Full open aperture f/2.4 (Canon EOS 300, Lucky SHD 100, Calbe R09)


    Aperture f/4 (Canon EOS 300, Lucky SHD 100, Calbe R09)


    Canon EOS 500D, f/4


    Canon EOS 500D, f/2.4


    Canon EOS 500D, f/8.3 (with smaller apertures this lens is pretty sharp)


    More pictures in this flickr set: www.flickr.com/photos/ren-on/sets/72157624886206060/

  2. #2

    Magnifying glass on a SLR

    These are really cool. I especially like the zone plate effects.

  3. #3

    Magnifying glass on a SLR

    Many thanks for your comments.

    The glow effect at the full open aperture is really great. I like how I can change the characteristics of the lens by the aperture. Already with an aperture of f/8.3 the lens is pretty sharp as you can see in the following comparison picture.



    The sharpness can be increased further at smaller apertures.

  4. #4

    Magnifying glass on a SLR

    Magical photos, Rene.
    I particularly like the leaves and also the rose against the black backgrounds. Also the graffiti.
    Makes you wonder - who needs a compound lens?

  5. #5

    Magnifying glass on a SLR

    Outstanding work renon.

    I'm guessing most of these are somewhat telephoto and your actually using the centre part of the projected image and avoiding the soft edges?

    Can plese give us a little more info. Focal length, exposure time, how exposure calculated, what camera settings, etc?

  6. #6

    Magnifying glass on a SLR

    Many thanks for your very kind comments.

    For my recentyl bought medium format Kiev's I plan to build the tele lenses by myself. If I want to avoid some lens failures I can use an achromat, but I like the special quality of these simple lenses.

    The magnifying glass lens I used for these pictures has a focal length of 100 mm. The diameter of the lens is 48 mm. At f/2.4 (full open, no additional aperture) I use a lens area of about 42 mm diameter. With smaller apertures I limit the area to the center; f.e. f/8.3 corresponds to a diameter of 12 mm.

    Mounted on the analogue Canon EOS 300 this lens has a focal length of 100 mm; mounted on the digital Canon EOS 500D a focal length of 160 mm due to the smaller sensor.

    The exposure times at full sunshine can be pretty short at f/2.4 so a ND4 filter can be very handy. The analogue Canon SLR needs no major adjustments. I can set the Camera to "Av" and the exposure time is roughly correct. The digital Canon SLR has problems, usually the pictures are overexposed by 1 up to 2 f/stops, so I have to use the camera in the fully manual mode. I'm doing this usually as well with the analogue camera. I like to have the full control. For choosing the exposure times a standard light (or the "guessomate" in the brain) meter can be used.

  7. #7

    Magnifying glass on a SLR

    rayh: your actually using the centre part of the projected image
    Ray, you are right. Today I measured the circle which would be covered by this lens. It's about 100 mm, so I could use it on a 4x5 camera as well.

  8. #8

    Magnifying glass on a SLR

    Yeh, I thought so Rene. I use magnifying glasses as simple lenses on my 8x10 and 11x14 box cameras. I actually like the soft edges, the amount of which can be controlled by the aperture used. That is, not only does a larger aperture reduce depth of field it also makes the edges softer than the centre. See attached examples.

    Attached files

  9. #9
    New Member Racer X's Avatar
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    Interesting results. I too like the flower and the leaves, very "artistic".

    I know a young man in Arizona who took various lens elements from a disassembled lens and held them in front of a DSLR and made some photos very much like yours. He also taped an element to a cardboard tube like is from a roll of toilet tissue, and then held that up to the camera's lens opening, again with very unique results.

    Experimentation can lead to some very nice work!
    Whiskey Is Sunlight Held Together By Water

  10. #10
    Administrator Tom Persinger's Avatar
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    thanks for the comment Racer X! I love to see old threads resurrected with new comments! thanks (and welcome to F295!)

    tom

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