10 April 2017

Canon Extension Tube vs Macro Lens Decision

Canon Extension Tube vs Macro Lens Decision
I was recently asked to assist one of my workshop delegates with the purchase of a Canon EF25 II extension tube for his Canon EF 50mm f/1.8 STM lens (on a Canon crop body) vs the purchase of a Macro lens.

I obliged by capturing a small garden flower with / without the Canon EF25 II Extension Tube on a Canon 70D (also a Canon crop body).

At the same time I used a Canon EOS 6D (full frame body ) with the Canon EF 100mm f/2.8 USM Macro Lens and captured the same flower at the same apertures.

The objective was not really image quality, but for determining the absolute minimum focus distance for each of the body / lens (extension tube used) to flower (measured from the front lens element).

Selected Aperture on all 3 images = f/11 Different ISO's (Auto-ISO). More detailed EXIF data below the individual images.

All images are uncropped (with some Adobe Lightroom 6 processing).

Lens AF on for all images (No flash / handheld) Conditions: overcast.

Body / Lens (Extension Tube)

  • Image 1: Canon EOS 70D / 50mm STM Lens
  • Image 2: Canon EOS 70D / 50mm STM Lens / Extension Tube
  • Image 3: Canon EOS 6D / 100mm Macro Lens

Minimum Focus Distance (MFD)

  • Image 1: Canon EOS 70D / 50mm Lens +- 350mm
  • Image 2: Canon EOS 70D / 50mm Lens / Extension Tube  +- 200mm
  • Image 3: Canon EOS 6D / 100mm Macro Lens +- 300mm

(Click to Enlarge)
Image 1: Canon EOS 70D / 50mm STM Lens f/11 / ISO 250 / 1/80s

Image 2: Canon EOS 70D / 50mm STM Lens / Extension Tube f/11 / ISO 1000 / 1/80s

Image 3: Canon EOS 6D / 100mm Macro Lens f/11 / ISO 1000 / 1/80s
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Vernon Chalmers Photography Workshops Cape Town 2017

  • Canon EOS Autofocus / AI Servo Master Class Cape Town More
  • Birds in Flight Photography Workshop Cape Town More
  • Canon Speedlite / Ring Lite Flash Photography Workshop Cape Town More
  • Macro / Close-Up Photography Workshop Cape Town More
  • Landscape / Long Exposure Photography Workshop Cape Town More
  • Digital Workflow / Lightroom Post-Processing Workshop Cape Town More