thypoch.com/simera-50mm

[brusby]

I use a look-up-table created using a Gamma Curve.

GAMMA by fiftyonepointsix, on Flickr

The idea- applying the Gamma Curve using the look-up-table going from 14-bits to 16-bits avoids "collisions", two input values mapping to the same output value that it would if going from 14-bit to 14-bit. The slope would have to exceed 4 on the curve for a collision to happen when mapping to 16-bits. I also set the Black Value of the DNG to one that better matches the CCD in my camera. Leica was throwing away a lot of shadow detail with the value they chose.

Love it!

 

[boojum]

I use a look-up-table created using a Gamma Curve.

GAMMA by fiftyonepointsix, on Flickr

The idea- applying the Gamma Curve using the look-up-table going from 14-bits to 16-bits avoids "collisions", two input values mapping to the same output value that it would if going from 14-bit to 14-bit. The slope would have to exceed 4 on the curve for a collision to happen when mapping to 16-bits. I also set the Black Value of the DNG to one that better matches the CCD in my camera. Leica was throwing away a lot of shadow detail with the value they chose.

M Monochrom (CCD) version- how many have sent the camera in for remapping?

My M Monochrom with the new sensor developed an "underperforming line" evident at ISO 10,000. Well that was annoying. It took me one morning to write code to correct the error. I "hardwired" the code to my camera, meaning "Column 3203 row 3105", found by looking at the image in Photoshop. I'm...

www.rangefinderforum.com

The same code also restores under-performing Columns on the CCD. What I found: "Bad Columns" were not dead. They had a DC offset issue. On the theory that the pixel cannot change value so quickly, compute the DC offset for the column looking on each side of it- and add it back.

There are a certain few programmers with screwdrivers who refute the rule. You seem to be doing magic with that M9 sensor. Leica, of course, does not care as this is a 15 year-old product. It is what is known as "mature" which is company-speak for "we don't care anymore". And that is too bad as the old M9 is kind of the gold standard.

Well, the world is still an imperfect place but there are a certain few making it a more pleasant imperfect place. Thanks.

 

[Sonnar Brian]

TTArtisan ASPH 50mm f1.4 for Leica M

I'm selling a TTArtisan ASPH 50mm f1.4 lens in new condition. I thought I'd like it adapted to my Nikon Zf, but its heavier than I'm looking for. E

www.rangefinderforum.com

A TTart 50/1.4 popped up here on RFF... Includes Box, like new, $250 from a long time member.