Building an Enhanced Macro Setup

Starting off with my new (to me–it’s actually about 12 years old) Nikon D70S and a Sigma 17-70mm F2.8-4 DC Macro lens, I decided to try out extension tubes. I bought a set of three Fotodiox extension tubes for $15. The set includes 7mm, 14mm, and 28mm, stacking together for a total 48mm. Basically, the extension tubes sit between the camera and the lens.

The initial problem with this setup is that you (a) lose tons and tons of light, (b) lose the ability to autofocus, and (c) lose the ability to tweak your aperture.

My strategy for overcoming this had to be simple: reduce movement and increase light!

First, I rested the camera on a desk. Then I turned off the autofocus on both the camera and the lens. Then I zoomed the lens all the way in and positioned the object I’m photographing so that it is just under a inch away from the subject. Then I turned off the flash and figured out an external light source. Sometimes I used an overhead lamp. Sometimes I used the flashlight app on my phone. Sometimes I used both. I experimented pointing my phone light at different angles for different results and different shadow configurations. Then I manually focused and shot away!

I’m very happy with the result. I estimate that I get almost twice as much magnification with the $15 tubes! Objects that are in reality 1 cm appear in my images well over 20cm. What I lose is photo quality and I have to fuss with external lighting and obsessively remove movement.

I look forward to warmer weather and a chance to try this setup out on invertebrates. For various reasons, this setup is not very practical for field work. However, I’m hopeful that it will be very helpful in getting better macro photos of invertebrates.

Here are some links to some of my tests on Flickr:

https://www.flickr.com/photos/34157166@N08/25052690861/in/dateposted-public/
https://www.flickr.com/photos/34157166@N08/25145997045/
https://www.flickr.com/photos/34157166@N08/24507329764/in/dateposted-public/
https://www.flickr.com/photos/34157166@N08/25019766612/in/dateposted-public/

Posted by marknenadov marknenadov, February 20, 2016 12:31

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