Lighting isn't much of a problem
2
ken_in_nh wrote:
SigmaTog wrote:
I have just purchased a vintage Canon 20mm f3.5 Macro Bellow Lens.
It is pristine, but it has a terrible flare.
Is there a way to deal with this please ?
What bellows are you using? What adapters?
I have the same lens but don't use it much anymore because there are easier ways to get to high mag while still preserving full automation. Also, lighting is a problem with such a short focal length lens, isn't it?
The magnification range for that lens is roughly 4x to 10x. The working distance at 10x is about 16mm, and that does sound scary for lighting, until you realize how small the MP 20 really is. It's similar to manual lenses of the day in that it has a small front. It even has a chamfered front, like a microscope objective, so it's 24mm in diameter where it faces the subject.
That means your light comes in from arctan((24mm/2)/16mm) = 37° from perpendicular.
At 5x this improves to 31°, while the overhyped MPE-65 can only manage about 48° at 5x. (Although, if you really want to see 5x goodness, the MP-35 can be lit from 20° from perpendicular).
I found a lovely illustration of this on a page about this lens over at Photography in Malaysia (a fantastic resource for photography outside of Malaysia, too).
https://www.mir.com.my/rb/photography/companies/canon/fdresources/fdlenses/fdmacro/2035macro.htm
Unfortunately, they don't allow direct image links.
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The term "mirrorless" is totally obsolete. It's time we call out EVIL for what it is. (Or, if you can't handle "Electronic Viewfinder Interchangeable Lens" then Frenchify it and call it "LIVE" for "Lens Interchangeable, Viewfinder Electronic" or "Viseur électronique").
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Rahon Klavanian 1912-2008.
Armenian genocide survivor, amazing cook, scrabble master, and loving grandmother. You will be missed.
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