Larry at Larry's Images.com: 12/3/17

Friday, December 8, 2017

Red Fountain Grass

A.K.A. Crimson Fountain Grass, Red Fountain Grass is part of a larger group of grasses known as Ornamental Grasses.

This image comes from Kingwood Center in September of 2005. The scientific name for this is Pennisetum setaceum. Wickipedia

I have admired ornamental grasses for years and Carol has grown to appreciate them also. We have some lovely grass West of our garage. I got the start from my son, Chad. I think it is called Eulalia Grass.

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Wednesday, December 6, 2017

Extension Tubes

Earlier I experienced vignetting when I added certain close-up filters. I found that I must open my aperture to eliminate this problem. With the strongest filters, I had to open to f/2.8, the lenses widest.

Later I discovered that the addition of extension tubes had an effect on this phenomena. If I added enough extension, I could use smaller apertures. Lately I have liked f/5.6 and experienced no vignetting until I was using a short focal length filter. When it reared its ugly head I eliminated it with the addition of 20mm more of extension. I recently purchased a second set to explore whether more extension would benefit my photography. To this time, I have not found that it will but I keep trying.

The above tubes total 68mm. They have three parts, 12mm; 20mm; and 36mm. They are placed between the camera and the lens. They have the same mounts as used on your camera system. If I use a teleconverter, which I will discuss at another time, I place it between the extenders and the camera.

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Monday, December 4, 2017

Apatite

You may remember that I wanted to clean this specimen. I soaked it in Oxalic Acid for over a week, not knowing how long it needed. It came out looking pretty good. I used my old toothbrush and tap water to remove the cleaning agent.

This sample it from Mount Apatite, Auburn, Maine. It is displayed at 6.5X. The field of view is 3.6mm

Apatite Showing Cleavage

The strong acid somehow caused the cleavage to weaken and the two sides seperated. I think the part on the right is still down in the acid. I have meant to look for it but forgot to do so.

Cleaned Apatite

You may remember we said this mineral is the defining mineral for hardness 5 in the Mohs Scale of mineral hardness. That's the middle one.

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Sunday, December 3, 2017

Canon EOS Rebel XSI

Tuesday, December 12, 2017

Canon Rebel XSI

I bought this camera about a year ago to use in micro photography. I read that 12 megapixel was the highest resolution camera one should use in micro photography. I saw images on mindat.org showing what happens when too high resolution camera is used. Ronald J. Pellar on mindat has a good essay on this subject. Can't understand the math he presents and can't make the calculations required. You might want to check out Ron's essay. I have expressed my confusion in a reply.

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