Raynox DCR-250 and light meter help

[KmH]

A stop is a halving or a doubling of the amount of light.

Most DSLR cameras are set by default to 1/3 stop steps of shutter speed, lens aperture and ISO.
For shutter speed and ISO a stop is divide by 2 (1/2) or times 2 (double).

ISO 200 is 1 stop from ISO 400. ISO 400 is 2x more light sensitive than ISO 200
1/100 is 1 stop from 1/200. 1/100 lets in 2x more light than 1/200 does.
f/5.6 is 1 stop from f/8. f/5.6 lets in 2x more light than f/8 does.
Lens aperture is about the area of the lens opening (not the diameter), so instead of a factor of 2, the factor is the square root of 2, which is roughly 1.4142 (5.6 times 1/4412 = 7.92 which gets rounded to f/8)

If you add a stop of lens aperture and a stop of ISO or shutter speed - you add 4 times more light.
If you add 1/3 a stop of shutter speed and 2/3 of a stop of aperture or ISO - you add 1 stop of light.

 

[iPhoto17]

oooo, The stops still confuse me after all these years shooting, and of course the day after i get the lens it rains, so I'll be out and about with it before work tonight

 

[iPhoto17]

I don't know why but when I go out front to look for spiders and bugs I get like, a mini panic attack and I go back inside until they are gone, I just don't like people watching me while I shoot for some reason, and it's just really uncomfortable for me, don't know why