Rear Lens Camera
How can I take clear photographs that I can blow up and crop?
For background info, I have a Canon 300D with a Sigma 100-300mm 4.5-6.7 lens and 2x teleconverter (rear mount, naturally) and I plan to shoot the pictures while it's mounted on a tripod with a remote shutter trigger. I figure, taking into account the crop factor, I get a magnification around 8-10x with just the 300mm lens by comparing it to a 8x pair of binoculars. The math says its 9.6x. So 2x that would be a little less than 20x. I need to get roughly 40x magnification so that means I need to blow up the picture 2x and crop in half. Since the camera is 6.3MP I'll still have ~3.1MP, which is suitable for 4x6 prints and making HD slideshows. I was just wondering if anyone out there had any tips to make it easier to get good results. Your experience is greatly appreciated. Thanks for your help
Use a stable tripod. Wait for a great and unbroken stillness to fall over the land. Set the self-timer for 10 seconds. Use the Russian firmware hack that enables mirror lockup on the 300D. Walk into another room. Light candles. Pray.
If your subject is at a fixed size, it could make sense to use the teleconverter. At worst it's going to introduce some fringing and do weird things to the bokeh. At any rate, since you're spreading the *same* amount of light over four times the sensor area, you should see nearly a linear halving of noise, compared to just blowing up the final image twice as large. The gains from the increased resolution may only be modest.
For that matter, if you've got a second teleconverter, put that on too! Avoid the final 50% crop entirely.
I can't stress how important stability is. You're dealing with a very narrow angle of view here (1.65 degrees diagonal), and the 40x magnification is working at every scale during capture, including camera movement. It will be magnified enormously.
But what you're describing doesn't sound impossible. It's digital, after all. Experiment! Be persistent. Try it with the 2x extender and without. Stop the lens down. Diffraction softening sharpens up nicely in Photoshop. Lens softness does not. If you get the best results by stopping the lens down to f/16 and shooting at f/32 with the extender, do it.
Note: Don't forget that megapixels are a square function of image size. A 50% crop from the 300D is only 1.57mp, not 3.1mp, and that's *with* the 2x extender. Without it, you'd need to make a 25% crop, which is only 768x512, or 0.39mp.
Hope this helps!
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