Longtime Exposures under Daylight Conditions tutorial - using gray filters for longtime exposures under daylight conditions used hardware Pentax istDS Digital SLR B+W Neutral Density Gray Filter 110 (ND3) 1000x, 58mm www.schneiderkreuznach.com Tripod used software CaptureOne Pro v3.7.2 http://www.phaseone.com RAW Converter DeltaLab (DeltaView) http://www.xdeltax.com Image Processing Software Xe847 Pro (PS-Plugin) http://www.xe847.com Color Correction Plugin image format source format Pentax RAW 12bit target format JPEG 8bit gray filter types type factor f-stops light no filter ND-filter ND 0.3 2x 1 50.00% 1/60 sec. 1/30 sec. ND 0.6 4x 2 25.00% 1/60 sec. 1/15 sec. ND 0.9 8x 3 12.50% 1/60 sec. 1/8 sec. ND 1.2 16x 4 6.25% 1/60 sec. 1/4 sec. ND 1.8 64x 6 1.56% 1/60 sec. 1 sec. ND 2.0 100x 6.66 1.00% 1/60 sec. 1.5 sec. ND 3.0 1000x 10 0.10% 1/60 sec. 16 sec. ND 4.0 10000x 13 0.012% 1/60 sec. 128 sec. ND 6.0 1000000x 20 0.001% 1/60 sec. 120 min. sample pictures 30 sec., f=19, ISO200, ND3 1/45 sec., f=22, ISO 200 30 sec., f=13, ISO200, ND3 1/180sec., f=13, ISO 200 30 sec., f=13, ISO200, ND3 1/60 sec., f=13, ISO 200 30 sec., f=13, ISO200, ND3 1/180sec., f=13, ISO 200 30 sec., f=13, ISO200, ND3 1/2 sec., f=13, ISO 200 {hot link to this tutorial: http://www.xdeltax.com/tutlongexp/index.html}