Trik wrote in post #18494793
Temma : thank you for the warning. I confess that I do not know what affect diffraction will have, as I have never used such a small aperture before. However, as I mentioned above, I have to crop very heavily, so will that help?
Lenses have an aperture at which they're sharpest. F29 is rarely the sharpest.
Diffraction produces softness in the image, which is the polar opposite of what you want.
Cropping won't make a soft image sharp. It'll just give you a bigger soft image.
If this is something you're planning to pursue, you'll eventually either be using:
- extension tubes
- a bellows
- a reversed prime lens (50mm and shorter works best)
- an enlarger lens (reversed or otherwise)
- a microscope objective
As I said, I'm getting around 3.5x with the 50mm manual reversed onto two sets of extension tubes. This kind of arrangement REQUIRES a focusing rail (manual or automated) since you cannot focus using the focus ring on the lens. You HAVE to move the camera forward and backward.
If I were photographing things that small, I'd be looking at microscope objectives. Don't be fooled into believing that you need a $1,000+ Mitsutoyo objective. The people at Wemacro will sell you a whole kit to allow you to use a microscope objective (including the objective) for somewhere around $100 USD. If you pick the pieces up individually on eBay and Amazon, you should come in under $100, not counting a rail of some sort. Amscope objectives get pretty good reviews for non-professional macrophotography.
That takes us back to depth of field. The odds of you having everything in sharp focus are pretty much nil, so that means focus stacking. You CAN do focus stacking with a cheap Chinese manual rail. I know I've done it. Would I like to do that with a moth egg shot through a microscope objective? I'd rather rather let the bolt on my M-1 rifle slam shut on my thumb... ten times in a row.
It's a question of how serious you are with this.
I did this in stages as my finances permitted.
In rough order:
- Canon 350D
- reverse ring
- cheap manual extension tubes
- cheap manual rail
- extension tubes with contacts
- coupler rings to mount reversed 50mm manual onto kit lens or 70-300mm zoom
- Tokina 100mm macro lens.
- Canon t4i to replace the 350D (needed live view)
- DSLR Controller software to do focus stacking via the auto focus Tokina 100mm macro
- Android tablet to run DSLR Controller
- Wemacro automated rail
Here are a couple of invaluable resources if you're serious about macrophotography:http://extreme-macro.co.ukhttp://www.photomacrography.net