Archived posting to the Leica Users Group, 1999/08/07
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Erwin wrote: > > Through the Hexanon 1.2/60mm at full aperure flows less energy than through > the Noctilux 1.0/50mm. In fact the Hexanon at 1,2 is equal to the Noctilux > at f/1.4. When comparing the two lenses at their full aperture, one should be > aware of the fact that it is a f/1.0 against f/1.4 game. 'Puzzled' of Singapore now writes: Could you explain this a bit further, Erwin? I have always thought that relative aperture (strictly speaking T-stop instead of f-stop) was the only factor controlling 'energy flow' - ie that an f1 50 mm lens has the same 'energy flow' as an f1 100 mm lens, for example. The 100 mm lens admits four times the energy from each point, but the 50 admits the energy from four times as many points, if you like. So I'm a bit baffled about how a 60 mm f1.2 has the same 'energy flow' as a 50 mm f1.4. Maybe it is just that we are each thinking of different things when we say 'energy flow'. Anyway, you have prompted me to look at an aspect of my M6s that I have neglected: their feng shui. I have now consulted an expert who has recommended that I place a small window-box planted with certain spiky cacti under the rangefinder window (to improve sharpness) and another with round-leaved plants under the lens (to improve bokeh). He hasn't yet told me what to do to improve the number of R8 tokens in my bank balance, except to suggest that I paint the cameras red. I shall keep the LUG posted about the success of my plantings. Regards, Malcolm