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Description
The results of an experiment to assess the effects of close up lens and extension tubes on a macro lens' performance.

Setup
Nikon D80, Nikor AF 200 micro lens f/4.0 and Nikon 6T close-up lens 62mm. Kenko 12, 20, & 36 mm extension tubes for Nikon mount.

ISO 400 Exposure 1/200 sec @ f/11 for all shots

1 single Vivatar 285 shot through a Wescott white umbrella, 18" from the flower

A series of photos was taken so the subject was at various reduction ratios starting with 1:4 then 1:2 and finally 1:1. The 6T close up lens was added (1:1+6T). The close-up lens removed and the extension tubes added starting with the 12mm, followed by the 20mm and finally the 36mm.

A combination of extension tubes was then tried: 12+20, 12+20+36, and finally, the Nikon 6T close-up lens added back to the stack.

With the addition of the extension tubes, the shots become more and more underexposed.

Description
The results of an experiment to assess the effects of close up lens and extension tubes on a macro lens' performance.

Setup
Nikon D80, Nikor AF 200 micro lens f/4.0 and Nikon 6T close-up lens 62mm. Kenko 12, 20, & 36 mm extension tubes for Nikon mount.

ISO 400 Exposure 1/200 sec @ f/11 for all shots

1 single Vivatar 285 shot through a Wescott white umbrella, 18" from the flower

A series of photos was taken so the subject was at various reduction ratios starting with 1:4 then 1:2 and finally 1:1. The 6T close up lens was added (1:1+6T). The close-up lens removed and the extension tubes added starting with the 12mm, followed by the 20mm and finally the 36mm.

A combination of extension tubes was then tried: 12+20, 12+20+36, and finally, the Nikon 6T close-up lens added back to the stack.

With the addition of the extension tubes, the shots become more and more underexposed.