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Giulio Scorio interview (and third party E-M5 battery test). - 43 Rumors

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The dimensions differ among adults by only one or two millimeters. The vertical measure, generally less than the horizontal distance, is about 24 mm among adults, at birth about 16–17 mm. (about 0.65 inch) The eyeball grows rapidly, increasing to 22.5–23 mm (approx. 0.89 in) by the age of three years. From then to age 13, the eye attains its full size. The volume is 6.5 ml (0.4 cu. in.) and the weight is 7.5 g (0.25 oz.)”

but here is something interesting: ” The retina has a static contrast ratio of around 100:1 (about 6.5 f-stops). As soon as the eye moves (saccades) it re-adjusts its exposure both chemically and geometrically by adjusting the iris which regulates the size of the pupil. Initial dark adaptation takes place in approximately four seconds of profound, uninterrupted darkness; full adaptation through adjustments in retinal chemistry (the Purkinje effect) are mostly complete in thirty minutes. Hence, a dynamic contrast ratio of about 1,000,000:1 (about 20 f-stops) is possible.[4] The process is nonlinear and multifaceted, so an interruption by light merely starts the adaptation process over again. Full adaptation is dependent on good blood flow; thus dark adaptation may be hampered by poor circulation, and vasoconstrictors like tobacco.

The eye includes a lens not dissimilar to lenses found in optical instruments such as cameras and the same principles can be applied. The pupil of the human eye is its aperture; the iris is the diaphragm that serves as the aperture stop. Refraction in the cornea causes the effective aperture (the entrance pupil) to differ slightly from the physical pupil diameter. The entrance pupil is typically about 4 mm in diameter, although it can range from 2 mm (f/8.3) in a brightly lit place to 8 mm (f/2.1) in the dark. The latter value decreases slowly with age, older people’s eyes sometimes dilate to not more than 5-6mm.”

A bit OFF, but would Olympus 45/1.8 owners tell to me whether it’s normal for te focus ring to have very slight but easily perceptible play along the LONGITUDINAL lens axis? The lens is brand new, I bought it 3 days ago.

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What will happen if I charge a non rechargeable AAA battery?

May 20, 767 by KidRandom | Posted in Other - Electronics

I want to charge one AAA rechargeable but I need two of them to do it. I'm thinking of using a non rechargeable battery as a substitute. What will happen when I charge it?

Thanks

First place, you should never combine chargeable batteries with non-chargeable, as they have different ma ratings and could damage whatever you're using them in.
Next, by charging the alkaline battery, you just might start a fire.
If