***DSLR Thread***

SO MUCH FUN!!

Orange Rind:
http://gcalvin.com/files/ExtensionTube/_GCC0406.jpg

Rusty Nail:
http://gcalvin.com/files/ExtensionTube/_GCC0409.jpg

Dying Bougainvillea Leaf:
http://gcalvin.com/files/ExtensionTube/_GCC0410.jpg

Bougainvillea Flower (the yellow part is only about 1/8 inch in diameter):
http://gcalvin.com/files/ExtensionTube/_GCC0413.jpg

Daisy:
http://gcalvin.com/files/ExtensionTube/_GCC0417.jpg

Razor-Grass Seed Stalk:
http://gcalvin.com/files/ExtensionTube/_GCC0419.jpg

Little Purple Flowers (each is about 1/4" in diameter):
http://gcalvin.com/files/ExtensionTube/_GCC0420.jpg

These were hand-held. Had I not been lazy, I'd have put my tripod up. The difference between in-focus and out-of-focus on these images is litterally a couple millimeters, and I found that as I'd breathe, the camera would change its distance from the subject just enough to put it out of focus either on the far side or near side.

What I really need is a focusing rail! That's next. They aren't cheap!

Also, I need to play around in better lighting. I could up the shutter speed while keeping things stopped to around f/8 if I had better lighting. Wonder how an off-camera flash might be able to be used?

Quote:

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Originally Posted by FlyBoeingJets

These were hand-held. Had I not been lazy, I'd have put my tripod up. The difference between in-focus and out-of-focus on these images is litterally a couple millimeters, and I found that as I'd breathe, the camera would change its distance from the subject just enough to put it out of focus either on the far side or near side.

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That's crazy! Very cool stuff. Any way you could take a photo of this rig all put together?

I was wondering about the focus of some of the photos. It seems the very center (obviously) is always in focus but outer edges that appear to be in the same vacinity are out of focus.

For example, the top head of the nail;, the center 50% horizontally is in focus but the upper and lower 25% horizontally is out of focus even though they are very close in proximity.

http://gcalvin.com/files/ExtensionTube/_GCC0409.jpg

Those are very nice Glenn. I'm gonna have to look into that.

****, i cant compete with that!

Quote:

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Originally Posted by BleedingPurple

That's crazy! Very cool stuff. Any way you could take a photo of this rig all put together?

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Yeah. Gimme a bit.

Quote:

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Originally Posted by BleedingPurple

I was wondering about the focus of some of the photos. It seems the very center (obviously) is always in focus but outer edges that appear to be in the same vacinity are out of focus.

For example, the top head of the nail;, the center 50% horizontally is in focus but the upper and lower 25% horizontally is out of focus even though they are very close in proximity.

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Well, if you think of the focus point as being a flat plane parallel to the front of the camera on which anything is in focus, then you can see why only the middle of the head of the nail is in focus. It passes through the focal plane at an angle because I took the image with the camera pointed down at the nail from an angle of approximately 45-degrees.

Had the sun not been behind a cloud, the f-stop might have been a little higher (tighter aperture, greater DOF) so more of the nail would have been in focus. I'm still learning how to control DOF with these things installed.

Quote:

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Originally Posted by kingofdodgers

****, i cant compete with that!

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What's to compete with? Do your own thing, man! We're not in competetion with each other!

:)

Great stuff!! I need some tubes :)

Quote:

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Originally Posted by BleedingPurple

That's crazy! Very cool stuff. Any way you could take a photo of this rig all put together?

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You know how hard it is to take a picture of your camera when that's the only camera you've got??

The D200 with the 50mm f/1.4 mounted on it:
http://gcalvin.com/files/ExtensionTube/IMG_2396.JPG

The D200 with the 50mm f/1.4 mounted on top of 68mm worth of extension tubes:
http://gcalvin.com/files/ExtensionTube/IMG_2397.JPG

Yes, that's my season ticket box. No I haven't burned it yet.

Heh.

I just stuck the big mama-jama 70-200 f/2.8 on the end of the stack of tubes. At 200mm, the focus point is like eight inches in front of the lens! Normal minimum focusing distance is like 5 feet!

But the funny thing was that at 70mm, the focus point is somewhere between the front lens element and the UV filter!! I can probably focus on the fingerprints on the UV filter!!

Quote:

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Originally Posted by FlyBoeingJets

You know how hard it is to take a picture of your camera when that's the only camera you've got??

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I thought about that after I asked. I figured you had to have a P&S or a camera phone. :) Thanks for posting!

Very interesting. Are these tubes a cheaper alternative to a very expensive lens or is the application totally different?