J Posthuma

J Posthuma

Lives in Netherlands Utrecht, Netherlands
Joined on Feb 6, 2011

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Subject Forum Last post
Nature Riddle Pentax SLR Talk 2 months ago
Saddleback caterpillar K-01/FA100 macro w/T9-2X closeup adapter Pentax SLR Talk 3 months ago
Show me YOUR "lonely benches" :-) Pentax SLR Talk 3 months ago
K30 fried after using in rain Pentax SLR Talk 5 months ago
Length of DA 18-135/DA 18-250/DA* 50-135/Tamron 70-300 Macro? Pentax SLR Talk 8 months ago
High ISO Deer Photos (10 images) Pentax SLR Talk 8 months ago
Barred Owl Pentax SLR Talk 8 months ago
Sharpest lens I ever had Pentax SLR Talk 8 months ago
Help me out: How to crop? Pentax SLR Talk 8 months ago
Jupiter with Meade ETX90 and Pentax Q Astrophotography Talk Forum 9 months ago
Sigma 8-16 does Catch-In-Focus Pentax SLR Talk 10 months ago
Jupiter with SMC 500mm f4.5 and K5IIs Pentax SLR Talk 10 months ago
OT: Duck's POOING in action (1 pic) Pentax SLR Talk 10 months ago
Some tilt-fun Pentax SLR Talk 10 months ago
Andromeda in a Light Polluted Sky Astrophotography Talk Forum 10 months ago
small anecdote Pentax SLR Talk 11 months ago
Multiple Exposure Technique for Star Fields Astrophotography Talk Forum 11 months ago
Finished building the Barndoor tracker. Astrophotography Talk Forum 11 months ago
T-Adapter/Barlow Lens Question Astrophotography Talk Forum 11 months ago
Samyang 800mm Mirror lens Part I Astrophotography Talk Forum 11 months ago
Perseid Composites Astrophotography Talk Forum 11 months ago
The Old Man and His Friend Pentax SLR Talk 11 months ago
How can I improve my moon images? Astrophotography Talk Forum 11 months ago
Quadrantits meteor shower. failed !!! Astrophotography Talk Forum 11 months ago
New K-3 review from Ed at photouniverse Pentax SLR Talk 11 months ago
Moon with the Tamron SP 500mm F/8 Mirror Lens. Astrophotography Talk Forum 11 months ago
How to improve efficiency of my workflow? Astrophotography Talk Forum 11 months ago
More Friendly Deer (10 photos) Pentax SLR Talk 11 months ago
Moon Mosaic/Pano finished! Astrophotography Talk Forum 11 months ago
'Merlin' tracking mount for beginner? Astrophotography Talk Forum 11 months ago
Coastal (California+) - Feel free to Add Your Shots Pentax SLR Talk 11 months ago
Imaging Through Murky Skies - M35 & NGC 2158 Astrophotography Talk Forum 11 months ago
Rosetta Nebula - 180mm F/2.5 Astrophotography Talk Forum 11 months ago
THE BEST CAMERA FOR MILKYWAY Astrophotography Talk Forum 11 months ago
Farm lost in the fog with Da 20-40mm ( photo) Pentax SLR Talk 11 months ago
M42 with Canon 70D and TV Genesis SDF Astrophotography Talk Forum 11 months ago
Warning Time Lapse contains stars and daylight ...https://vimeo.com/83778705 Astrophotography Talk Forum 11 months ago
one more attempt at horsehead and flame Astrophotography Talk Forum 11 months ago
A few nightscapes of our local pier with the DA 20-40 Pentax SLR Talk 11 months ago
The Marble Pentax SLR Talk 11 months ago
What 2 mp can do Pentax SLR Talk 11 months ago
Samyang 800mm mirror lens Part II Astrophotography Talk Forum 11 months ago
Comet Panstarrs + aurora (E-330 + Hexanon 55mm F/1.2, ISO 800, 4sec, f=1.2) Astrophotography Talk Forum 11 months ago
Rather new here, some results with moderate means Astrophotography Talk Forum 11 months ago
Comparing EXIF info. on Photo I took from my Gallery. Pentax SLR Talk 11 months ago
Photos: Paths (K-5+DA15&DA70) Pentax SLR Talk 11 months ago
Welcome interloper Pentax SLR Talk 11 months ago
K3 in very low light Pentax SLR Talk 11 months ago
Mantis trick . Pentax SLR Talk 11 months ago
Massive solar flare to hit Earth Astrophotography Talk Forum 11 months ago