Reverse Mount Macro
Reverse mount lens for dSLR?
Yeah, macro for the poor. I was looking into it and I was wondering a few things.
How does it work? What would I need for it?
Which of these lenses would be best suited for it?
1) Canon EF-S 18-55mm f/3.5-5.6 IS
2) Canon F-S 55-250mm f/4-5.6 IS
3) Canon EF 50mm f/1.8 II
All you really need for reverse mount macro photography is a roll of tape and two lenses. You can determine magnification by dividing the focal length of the first lens by the focal length of the second.
In your case, you could achieve maximum magnification by attaching your 55-250mm to the camera, zooming in to 250mm, then reverse-mounting the 18-55mm zoomed out to 18mm. An object of a given size will be projected over an area of sensor 13.8x greater than itself. In other words, a grain of rice will fill the frame.
The problem with reverse mount macro photography is the working f-stop. When you reverse mount a lens, you're turning the exit pupil on the second lens into the entrance pupil of the optical system. As exit pupils tend to be small, you will need a *brutal* amount of light to take handheld pictures this way.
Focus will also be fixed. You will have to achieve focus by moving the camera physically closer or further away from the subject. It goes without saying that DOF will be razor thin, and you will be shooting wide open all the time, since you can only stop down the intermediary lens that's attached to your camera, and not the objective lens that's reversed over the front of it.
You may get better results from the 50mm f/1.8 simply because the exit pupil is larger. Experiment! It's digital, after all. If you dig the effect, consider purchasing a standalone reversal ring. I personally don't feel like I use the technique often enough to justify the cost, but that's just me.
Edwin: I don't think we're going to see eye-to-eye on this. I am proposing a stopgap measure so that Squid can assess the utility of the technique. More serious than the risk of damaging a lens is the risk of buying the reversal ring without experience or context, using it once, balking at the limitations, and consigning it to a junk drawer. I know that mine is already full of junk. What about yours?
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 Fotodiox 52mm Filter Thread Lens, Macro Reverse Ring Camera Mount Adapter, for Nikon D1, D2, D3, D3x,D3s, D100, D200, D300, D300s, D700, D40, D40x, D50, D60, D70, D70s, D80, D90, D3000, D3100, D5000, D7000 List Price: Sale Price: $7.95 You save: $11.95 (60%)  Eligible for free shipping!Availability: Usually ships in 24 hours  |
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 Fotodiox 52mm Filter Thread Lens, Macro Reverse Ring Camera Mount Adapter, for Canon EOS 1d,1ds,Mark II, III, IV, 5D, Mark II, 7D, 10D, 20D, 30D, 40D, 50D, 60D, Digital Rebel xt, xti, xs, xsi, t1i, t2i, 300D, 350D, 400D, 450D, 500D, 550D, 1000D List Price: Sale Price: $6.25 You save: $13.65 (69%) Eligible for free shipping!Availability: Usually ships in 1-2 business days |
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