jtra

Lives in Czech Republic Prague, Czech Republic
Has a website at http://jtra.cz/
Joined on Mar 6, 2008

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Subject Forum Last post
Spectacular Bokeh: Wavelength Dependence Nikon SLR Lens Talk 6 days ago
Sigma 135/1.8 released; looking forward to comparisons vs Nikon 105/1.4 Third Party Lens Talk 1 week ago
Look vs. Sharpness a.k.a. 1.4G vs. Art Nikon SLR Lens Talk 3 weeks ago
Lenstip review - Sigma 135mm f1.8 Art Third Party Lens Talk 1 month ago
24-120mm F4 samples at f4! Could someone help me out? Nikon SLR Lens Talk 1 month ago
Sigma 12-24mm f/4.5-5.6 AF II DG HSM vs Tokina 16-28mm f/2.8 AT-X Pro (IF) FX Lens Nikon SLR Lens Talk 2 months ago
Sigma 135 1.8 Art first review Third Party Lens Talk 2 months ago
The Naked Truth About Bokeh Nikon SLR Lens Talk 3 months ago
Does anyone have both 105mm f/1.4 and 105mm f/2 dc? Nikon SLR Lens Talk 4 months ago
Expert Opinion needed , Sigma ART , micro-contrast and depth rendition Nikon FX SLR (DF, D1-D5, D600-D800) Talk 4 months ago
24-85 3.5-4.5G ED VR & 24-120 4G ED VR Comparison and Overall IQ Nikon SLR Lens Talk 4 months ago
D750 live view "focus points" Nikon FX SLR (DF, D1-D5, D600-D800) Talk 5 months ago
How to Share D810 Small JPEGs via Cellphone, in the field? Nikon FX SLR (DF, D1-D5, D600-D800) Talk 6 months ago
Nikon D 750 : incomplete image Nikon FX SLR (DF, D1-D5, D600-D800) Talk 6 months ago
Bokeh and rain. Nikon SLR Lens Talk 6 months ago
Lens Microcontrast 2 Nikon SLR Lens Talk 7 months ago
Do older lenses have better bokeh? Open Talk 7 months ago
HMM... D750: Err bug :-( Nikon FX SLR (DF, D1-D5, D600-D800) Talk 7 months ago
Weird AF tune issues with D750 Nikon FX SLR (DF, D1-D5, D600-D800) Talk 7 months ago
D750 and App for Smart Phone? Nikon FX SLR (DF, D1-D5, D600-D800) Talk 7 months ago
First impressions: Samyang 135mm f2- Nikon AE Third Party Lens Talk 7 months ago
Does anyone use the dpad lock switch? Nikon FX SLR (DF, D1-D5, D600-D800) Talk 7 months ago
Sigma 50mm discrepancy Third Party Lens Talk 7 months ago
Any possible D750 replacement announcement this year? Nikon FX SLR (DF, D1-D5, D600-D800) Talk 7 months ago
Is Nikon D810 with 24-120mm still a good buy? Nikon FX SLR (DF, D1-D5, D600-D800) Talk 7 months ago
How does Canon's new dual pixel raw enables to refocus in post? Photographic Science and Technology 8 months ago
$270 Bargain Third Party Lens Talk 8 months ago
Is the ERR code on the D750 a warranty repair? And less than happy people Nikon FX SLR (DF, D1-D5, D600-D800) Talk 8 months ago
D750 failed shutter Nikon FX SLR (DF, D1-D5, D600-D800) Talk 8 months ago
What Killed Sigma 50-150 f/2.8? Third Party Lens Talk 8 months ago
105mm/1.4 G vs. Guess the Lens! Nikon SLR Lens Talk 8 months ago
How many shutter actuations do you REALLY get from a camera? Nikon FX SLR (DF, D1-D5, D600-D800) Talk 9 months ago
Nikon 105mm f1.4 - Its Official - Its Expensive Nikon SLR Lens Talk 9 months ago
When is the D750 supposed to be replaced? Nikon FX SLR (DF, D1-D5, D600-D800) Talk 9 months ago
Dpreview testing of the D810 and D750 low light AF Nikon FX SLR (DF, D1-D5, D600-D800) Talk 9 months ago
Nikon 24 1.8G or Sigma 24 1.4 Art ? Need some feedback Nikon SLR Lens Talk 9 months ago
Anybody using D750 with zfinder/lcdvf or similar for LV manual focus? Nikon FX SLR (DF, D1-D5, D600-D800) Talk 10 months ago
Sigma 50mm 1.4 ART vs Nikon 50mm 1.8G Third Party Lens Talk 11 months ago
Comes the D810 beater from Pentax for 1800 USD Nikon FX SLR (DF, D1-D5, D600-D800) Talk 11 months ago
24-120 f/4 not so hot at the long end? Nikon SLR Lens Talk May 31, 2016
DxO reviews the D5 Nikon FX SLR (DF, D1-D5, D600-D800) Talk May 29, 2016
Focal length of smartphone cameras Mobile Photography Talk May 24, 2016
if you could have 4 Nikon lens for free,,,,,,, Nikon SLR Lens Talk May 12, 2016
Tamron 15-30 2.8 not comaring as expected againt Olympus 7-14 Nikon SLR Lens Talk May 11, 2016
Nikon D5 Motion Blur Images Issue Nikon FX SLR (DF, D1-D5, D600-D800) Talk May 3, 2016
Nikon d610 walk around lens Nikon SLR Lens Talk May 3, 2016
Tamron 70-300vc moon shot Third Party Lens Talk Apr 22, 2016
Tripod help and advice, for possibly the Sirui K-30X ball head Accessories Talk Apr 22, 2016
24 mm lens advice Nikon SLR Lens Talk Apr 15, 2016
New user looking for Sirui tripod/ball head help Accessories Talk Apr 14, 2016