Originally posted by ogl ISO6400 and 1.4 (I know only DA55/1.4 and FA50/1.4 with such aperture) + 1/40 = using SR and unacceptable IQ. Sigma 30/1.4 - I don't think that it's good lens.
The Sigma 30/1.4 is a great lens. Have a look at the respective
sample image thread and tell me with which other lens (sans the FA 31/1.8) you can get results like this.
There is also the excellent Rokinon 85/1.4, the Nokton, the f/1.2 lenses, etc.
Originally posted by ogl Did the same with K200D + FA24*/2- from semi-dark corridor to dark room - f4.5, ISO200, 1.6 s.
Assuming an 18% exposure that's just an EV of 2.6. Not a challenge.
Originally posted by ogl Let's have a look at K-5 and K200D at full SNR - it's very interesting:
Where are these figures from?
Are they based on pixel noise or image noise?
If they are based on pixel noise, they'd be inadequate, favouring the K200D with its lower resolution.