تويت
الصخور والمعادن ..
العالم الطبيعي ..
كتاب التصوير الفوتوغرافي المغلق
Rocks and minerals
Natural rock formations are built on such a large scale that they are best recorded with a standard or even wide - angle lens . Close - ups can be taken in the field to illustrate portions of rock or soil . You can take comparative pictures of different sized pebbles or different colored sands on a beach , while a volcanic area may provide scope for textural close - ups of rope lava . The best minerals are unlikely to be found by chance in the field , although it can be fun exploring an area at night with an ultra - violet lamp in search of fluorescing rocks .
I select the studio lighting for each specimen by turning it in my hand beneath continuous light sources . Crystals are most difficult to light because the internal surfaces of the facets reflect light . Black velvet is a good background for photographing strongly colored specimens on color film . In larger - than - life - size close - ups , specks of dust can be removed by pressing down and peeling off strips of scotch tape from the velvet . Gray or even white art paper may be a more suitable background for mono chrome work .
Enhancing a rock specimen
When viewed in ordinary light , calcite is a white crystalline rock , but after several minutes exposure beneath ultra - violet light , it fluoresces a spectacular pink color . I fastened a pair of " black " ultra - violet emitting tubes to the underside of a table top with a deep flange as ultra - violet wavelengths are harmful to the eyes . The rock was then placed on the ground on black velvet as shown in the set - up on the left . The picture was taken in a blacked - out room with a Wratten 12 ( yellow ) filter over the camera , which rendered the rock orange . Lens Hasselblad 80mm + 25mm extension Mag . on film * 0.4 Mag . on page × 1.3
A landscape replica ▷ As different colored muds settle to form sediments they build up multi - colored layers . If an upheaval then takes place , the linear arrangement of the layers may be disrupted to form an intriguing abstract resembling ruined buildings , known as " ruin marble " . This piece , originating in Italy , has been sectioned and polished . As with any shiny surface , the main problem when photo graphing it is to overcome distracting reflections . I took this picture by indirect natural light after laying the section on black velvet on the floor of a sunroom early on an overcast day . Lens Hasselblad 80mm + 31mm ( 21 + 10 ) extension Mag , on film × 0.4 Mag . on page × 2
العالم الطبيعي ..
كتاب التصوير الفوتوغرافي المغلق
Rocks and minerals
Natural rock formations are built on such a large scale that they are best recorded with a standard or even wide - angle lens . Close - ups can be taken in the field to illustrate portions of rock or soil . You can take comparative pictures of different sized pebbles or different colored sands on a beach , while a volcanic area may provide scope for textural close - ups of rope lava . The best minerals are unlikely to be found by chance in the field , although it can be fun exploring an area at night with an ultra - violet lamp in search of fluorescing rocks .
I select the studio lighting for each specimen by turning it in my hand beneath continuous light sources . Crystals are most difficult to light because the internal surfaces of the facets reflect light . Black velvet is a good background for photographing strongly colored specimens on color film . In larger - than - life - size close - ups , specks of dust can be removed by pressing down and peeling off strips of scotch tape from the velvet . Gray or even white art paper may be a more suitable background for mono chrome work .
Enhancing a rock specimen
When viewed in ordinary light , calcite is a white crystalline rock , but after several minutes exposure beneath ultra - violet light , it fluoresces a spectacular pink color . I fastened a pair of " black " ultra - violet emitting tubes to the underside of a table top with a deep flange as ultra - violet wavelengths are harmful to the eyes . The rock was then placed on the ground on black velvet as shown in the set - up on the left . The picture was taken in a blacked - out room with a Wratten 12 ( yellow ) filter over the camera , which rendered the rock orange . Lens Hasselblad 80mm + 25mm extension Mag . on film * 0.4 Mag . on page × 1.3
A landscape replica ▷ As different colored muds settle to form sediments they build up multi - colored layers . If an upheaval then takes place , the linear arrangement of the layers may be disrupted to form an intriguing abstract resembling ruined buildings , known as " ruin marble " . This piece , originating in Italy , has been sectioned and polished . As with any shiny surface , the main problem when photo graphing it is to overcome distracting reflections . I took this picture by indirect natural light after laying the section on black velvet on the floor of a sunroom early on an overcast day . Lens Hasselblad 80mm + 31mm ( 21 + 10 ) extension Mag , on film × 0.4 Mag . on page × 2
تعليق