Macro Photography III

Setup with 105mm on 2x converter and Mamiya 50mm reversed

I set out to show something at 5.76x macro.  This was the setup.

Subject for Size

The "subject" (I will discuss that another day) has little dark color inclusions (barely visible in this image).

Please note the working distance for this setup.  I did not measure it but by observation, it does not appear that different from that of the same setup without the 2x convertor.  I thought that probably was caused by the longer effective lens (105mm versus 210mm with 2x converter).  Longer lens equals longer working distance.  The Mamiya - 50mm greatly decreases working distance.

Machinist's Scale at 5.75x

Please note the shallow DOF (depth-of-field) is this shot.  The scale is laying directly on the cloth background.  The scale is 42/1000 inch thick which is about 1/16 inch.  NOT MUCH DOF!

Subject with Metal Inclusion

This shot is a Helicon Focus combined stack of seven shots.  It was difficult for me to produce.  I had to work on my focusing rail and adjust it.  I found that the smallest increments in which I could move the dial might not be small enough.  I worked a couple days on this and never achieved what I had envisioned.

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Farm Shots

Barn

I have a customer who wants me to photograph her Grandmother's farm.  I went with her last Sunday on a preliminary visit.  I made these images then.  I understand the farm is about 80 acres.  The light was changing by the moment with the fast moving clouds.  You could just about setup on a subject and wait on the light to come.  If you could imagine it, it would come.  There was also a wind which chilled me to the bone.  I was unable to stay out long.  I hope that I get to go back.

Bench

I found it to be a very imaginatively fertile location.  I saw an interesting stream bed, old farm equipment, trees and who knows what else I might fine!  More later, perhaps. 

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Macro Photography II

Water Flea

I used my Sigma 105 mm Macro for this shot with a Mamiya 50mm mounted on the front in reverse as a closeup lens. 

Sigma 105mm with Mamiya 50mm Mounted on the Front

Please note that I used an Adorama Micro Focusing Rail for yesterday's tests.  It greatly aided the close focusing as I could set the lens on the closest setting and then focus with the focusing rail.  I guess that it is why it is named thus.

Water Flea

This is another shot with the above setup.

Sigma 105 mm with Mamiya 50 mm

My calculations showed this to be 2.89x on the sensor.

I have yet to make any shots, except the scale, at higher x numbers.  This is to be continued.

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Macro Photography

Scud

I just read George and Kathryn Lepp's column in the current Outdoor Photographer Magazine.  In it, one question was about macro photography beyond 1X.  It informed me of some aspects of that genera I had previously not considered.  I had used a 1.4x teleconverter with my Sigma 70-300 "macro" lens but never a 2x teleconverter with my Sigma 105 mm macro lens.

I decided to think through the process of macro photography once again.  The above shot was made using my Sigma 105 mm macro with a Canon 500d high quality multi-element closeup lens mount in front.  Incidentally,  That rig will auto focus.  I believe I used auto focus to make this image.  

Canon 7d, Sigma 105 mm, canon 500d

I decided to photograph a machinist's scale.  I set the lens on its nearest focus point, the point at which it is rated at 1x.  1x would the where the subject is full size on the sensor.  The sensor measures 22.3 mm which converts to .878 inch.

Sensor Size

This is a a shot of the 64th gradation side of the scale.  (All shots of the scale were made of this side)  I get 62.5/64 from this which converts to .820 inch.  It looks like a .06 inch difference which seem excessive to me.  Any way, that is what I got for 1x.

Backswimmer

This insect was shot using the Sigma 105 mm lens other wise unembellished.  That means it could not be larger than 1x on the sensor.

I did notice that using the 2x converter on the the 105mm lens did not cause a major reduction in the working distance.  I will get to that tomorrow.

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GNC: More than a Facelift!

Gorman Nature Center

The visitor's center is getting more than a facelift.  The South facing roof is large and it is being redone to add 104 solar panels. They say that they should generate 100% of the electrical needs.

Gorman Nature Center

I was there the other day when it was snowing lightly and someone was up there working.  Not a place I would like to be in that weather.

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Stones at Gorman

Stream Bed Stones

I took a walk down the stream bed the other day.  It tends to happen this time of year.  I set up my recorder and walked while it recorded the birds, etc.  I wanted to view the stream bed since it is almost always different after a rain.  

Striated Igneous Rock

I always see rocks I like when I take these walks.  This is one I saw on my above mentioned walk.  I have cans and cans of rocks in the basement at home.  I thought that I would make closeups of the rock instead of picking it up.  

Granular Two-color Rock

I find myself trying to classify these rocks based on my very limited knowledge of geology.  I wonder from where they came.  I usually think North in answer to that question because of the glacier.  I look into them and try to imagine what their forming might have looked like.  The rocks are mostly rounded in the stream bed for obvious reasons.  

I have been making it out more lately.  We are nearing the beginning of March and then spring.  I love being out.  I hear birds I don't know and wonder what they are.  I look and listen to clues as answers to my questions.

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