Archives for January 2015

A couple of days ago, I looked at the visual  shadow and dynamic range effects of the Sony alpha 7 shutter modes that reduce the bit depth from 13 to 12 bits. In the case of the Sonys, the loss in bit depth is accompanied by an increase in read noise that results in visible… [Read More]

I don’t know if you’re tired of looking at pictures of bookcases and test charts, but I’m tired of making them. So, for a little break, here are some IR pictures with the LifePixel-modified Sony a7 and the 28mm f/1.4 Nikkor-D. The camera has LifePixel’s “Super COlor” filter, which passes some visible light in addition… [Read More]

A reader asked if I’d test the in-body image stabilization (IBIS) on the Sony alpha 7II with a really short lens, to add to  the testing I’ve done previously with a 180mm Apo-Telyt and the Zony 55mm FE and the Leica 28mm f/2.8 Elmarit-R. I selected the Leica 16/18/21mm f/4 Tri-Elmar, aka the WATE. Sony calls IBIS SteadyShot…. [Read More]

When you change shutter modes on the Sony alpha 7II, you may affect the bit depth. Because of the raw compression algorithm on this and all the other alpha 7 cameras, which is not defeatable, I need to go into a little detail about just what bit depth I’m talking about. The raw compression scheme… [Read More]

A couple of days ago, I tested the MTF vs f-stop of the 28mm f/1.4 Nikkor-D mounted on a IR-modified Sony alpha 7. At the time, there was some discussion as to why the lens delivered the best IR-only results at f/2.8. Jack Hogan speculated that it might be something with the adapter. I checked and… [Read More]