MP-E at 10X
Victor Engel wrote:
Pansottin wrote:
Victor Engel wrote:
SigmaTog wrote:
Can the MPE65 be used with an electric extension tube ?
Extension tubes work fine, but the lens is basically a built in extension tube lens anyway, so you'd need a lot of length to make much difference.
Hi, what if it's a bellows with a maximum extension of 192mm like the Novoflex BallPro1? How will the MP-E 65mm perform?
Thanks.
An approximation is to use the lens equation: 1/d0 + 1/d1 = 1/f where d0 is the sensor distance to the lens and d1 is the subject distance. At 1:1 d0 = d1 = 2f
I think the magnification is basically d0/d1.
So the MPE at maximum extension would be 1/5D + 1/D = 1/f
Solving for D,
1/5 + 1 = D/f
f/5 + f = D
So at full extension, the distance from lens to focal plane is 5(6/5 f) or 6f.
The focal length f = 65mm so the extension is 6*65 = 390mm
So how much difference will a 192mm extension tube make? (192 + 390) * 5 / 390 = about 7.5x
The MP-E is not a simple lens, but I think this formula is close enough for this question.
Derivations were done while I was in a meeting, so there could be an error.
Thank you Victor. Even if there is a margin of error, it gives an idea of what can be expected in terms of magnification.
And by the way; your solution with the Canon extender x2 III produces more magnification than a 192mm bellows. Is this due to the nature of the extender which includes optics and the bellows is just empty space between the lens and sensor?
Fujifilm GFX 50R
Canon MP-E 65mm f/2.5 1-5x Macro
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Fujifilm 120mm F4 Macro
Fujifilm GF 110mm F2
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