xpatUSA

xpatUSA

Lives in United States Bellville, TX, United States
Works as a Retired Consulting Engineer
Has a website at tcktek.blogspot.com
Joined on Dec 15, 2011
About me:

Mostly close-ups of watches for web publication.

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Snapshot of threads updated recently in which you have recently participated.

Subject Forum Last post
I need a Reference for a Sensor MTF Formula :-( Photographic Science and Technology 8 hours ago
What would the Ideal MP be for a FF 1:1:1 Foveon DSLR? Sigma Camera Talk 10 hours ago
SD1M in the 1930s Sigma Camera Talk 11 hours ago
Does the DP3 have higher resolution and IQ than the DP2Q? Sigma Camera Talk 13 hours ago
My dp2q review Sigma Camera Talk 14 hours ago
Merrill White Balance -- custom cards for warming effect Sigma Camera Talk 18 hours ago
Sigma on google plus Sigma Camera Talk 18 hours ago
Possibly stupid question... why do larger sensors fare better in DxOMark's "low light" test? Photographic Science and Technology 21 hours ago
Infrared ‘calibration’ Photographic Science and Technology 1 day ago
X3F BW from blue layer Sigma Camera Talk 1 day ago
My favourite bird. 8 foot wing span and as daft as a brush. The Pelican Sigma Camera Talk 2 days ago
$1k for SD1M or DP2Q Sigma Camera Talk 2 days ago
Weekend Pix for the week ending August 22nd to 24th, 2014 Sigma Camera Talk 2 days ago
Fun with micro contrast Sigma Camera Talk 2 days ago
SD15 keeps plugging away Sigma Camera Talk 2 days ago
Extreme OVF Magnification . . Photographic Science and Technology 3 days ago
Laurence, how about this one? Sigma Camera Talk 3 days ago
what happens to the photos captured by my lens? Photographic Science and Technology 3 days ago
Moirée DP2M Sigma Camera Talk 4 days ago
Anything New at Photokina Sigma Camera Talk 4 days ago
Is it possible to get true monochrome from CFA raw data? Photographic Science and Technology 4 days ago
Reid Reviews B&W Dp2Q vs Dp2M vs Leica Monochrom Sigma Camera Talk 4 days ago
Sigma ruined me for other systems... Sigma Camera Talk 6 days ago
Buyers remorse Sigma Camera Talk 6 days ago
Sigma macro 105mm lens Sigma Camera Talk 6 days ago
SD14: Old Log Cabin in Texas Sigma Camera Talk 6 days ago
FullFrame Sigma pics :) Sigma Camera Talk 6 days ago
Canon 7d-ii rumor: multi-lawyer sensor a'la Foveon Sigma Camera Talk 1 week ago
Tilt Shift Swing Slide Sigma Camera Talk 1 week ago
A few Infrared Today Sigma Camera Talk 1 week ago
This is all JackM's fault.. Sigma Camera Talk 1 week ago
Sigma DP2M 30mm Compact Camera + VF21 viewfinder + Extras For Sale and Wanted 1 week ago
Back from hols... Sigma Camera Talk 1 week ago
Merrill JPEG vs. RAW Sigma Camera Talk 1 week ago
HowTo? SPP settings to get equiv of RawDigger (raw image analyzer) to facilitate ETTR? Sigma Camera Talk 1 week ago
View finder Sigma Camera Talk 1 week ago
DP1m goes to Stonehenge Sigma Camera Talk 1 week ago
My simple but extremely nice X3F workflow Sigma Camera Talk 1 week ago
Rim Light Sigma Camera Talk 1 week ago
HowTo? Find EXIF that indicates what Quattro "Tone Control" option in effect? Sigma Camera Talk 1 week ago
Just arrived, my DP3M Sigma Camera Talk 1 week ago
Are Moire patterns ever seen in monochrome cameras? Photographic Science and Technology 1 week ago
2,300 mA-h battery heads up for SD14, SD15, SD1 Sigma Camera Talk 2 weeks ago
SPP 5.5.3 NR Sliders Question Sigma Camera Talk 2 weeks ago
Sensor linearization Photographic Science and Technology 2 weeks ago
Red Bleed on Merrill Sigma Camera Talk 2 weeks ago
SIGMA DP2 Merrill base ISO is 200? Sigma Camera Talk 2 weeks ago
What do you mean by equivalence? Photographic Science and Technology 2 weeks ago
DP2M raw versus . . . SD14 raw, yep. Sigma Camera Talk 2 weeks ago
Thank you xpatUSA Photographic Science and Technology 2 weeks ago