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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses
Thread started 09 Nov 2008 (Sunday) 02:20
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100mm F2.8 Macro(Non USM) Light Loss

 
The ­ Fox
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Nov 09, 2008 02:20 |  #1

Hello again everyone.

I would like to know if anyone knows what the light loss of the old 100mm macro is at 1:1? I am shooting in the studio with strobes and the AE does not work so I can not calculate the light loss when I am close to my subject. I always have to shoot tethered and play with the exposure form my light meter(sekonic L758).

Nick


"I work from awkwardness. By that I mean I don't arrange things. If I stand in front of something, instead of arranging it, I arrange myself" -Diane Arbus
7D Gripped x2 | 50D Gripped | 17-50mm F2.8 | 35mm F1.4 | 50mm F1.4 | 85mm F1.8 | 70-200mm F4L IS |

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The ­ Fox
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Nov 10, 2008 10:55 |  #2

Bump.
Nick


"I work from awkwardness. By that I mean I don't arrange things. If I stand in front of something, instead of arranging it, I arrange myself" -Diane Arbus
7D Gripped x2 | 50D Gripped | 17-50mm F2.8 | 35mm F1.4 | 50mm F1.4 | 85mm F1.8 | 70-200mm F4L IS |

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Lester ­ Wareham
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Nov 10, 2008 12:51 |  #3

It will 2 stops, that is just physics and will be the same for all OLE focused lenses or magnification achieved by extension tubes (neglecting papillary magnification).

Interestingly I measure the internal focus USM version also with stops of light loss at 1:1, however at intermediate magnifications the light departs a little from the OLE focus case being slightly higher. Small enough it could be measurement error however.

I used to use manual flash 20-30 years ago so I know the equations for the light loss, this is on macro DOF but the exposure correction factor is listed also http://www.zen20934.ze​n.co.uk ...oF_with_Macro_Photo​graphyexternal link.


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100mm F2.8 Macro(Non USM) Light Loss
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses


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