I asked one question about macro adapters and one tells me about close up filters and I don't get it. He tells "+1 = 1000mm, +2 = 500mm, +3 = 333mm,..." and when he tells me about how to use them, I can't figure it out.
This lash-up now allows you to focus on an object 250mm (10 inches) from the front of the lens
I totally get it. It says that 'now an object that is 10 inches away from the lens, can be focused', right?
But what does he say by this?
Generally, the normal focus range is about equal to1 additional diopter power. Thus the natural focusing range of the camera allows you to achieve focus down to about 200mm (8 inches).
He says normal MFD of a lens is 1 meter, right? (does 'a normal lens has a +1 diopter' mean the same?)
You camera has a natural range of focus distance. Unusually, infinity to about 1 meter (3 feet). Mount a supplemental lens +3 and with the camera set to infinity your focus distance is now 333mm
So, a +5 close up filter reduces the infinity normal MFD to 200mm? And now an object that is 8 inches away from the lens, can be focused? The millimeter equivalent thing of the close up filter gives the lens the ability to have a MFD of the equivalent millimeters, am I correct?
- +2 → 500mm
- +3 → 333mm
- +4 → 250mm
And again, I completely don't get what he has said on the 4th comment..
So please help me to clarify this..