Search found 4 matches

by Borberg
07.03.2005 04:37
Forum: Helicon Focus: Macro
Topic: Accurate slicing
Replies: 8
Views: 34642

For most of the macro lenses the manufacturer gives the DOF at certain magnification factors. I always shoot at f8 because quality deteriorates and exposure times become long (at 5x up to 15 seconds). The trick is to calcualte how many slices you need to achieve the desired DOF and by how much the c...
by Borberg
21.02.2005 01:51
Forum: Helicon Focus: Macro
Topic: One shot at f32 or 4 shots at f8:?
Replies: 2
Views: 22704

One shot at f32 or 4 shots at f8:?

It is tempting to shoot a macro picture in a single shot if the depth of field at f32 is large enough. But what will the result be? After much experimenting with my Canon 1Ds and 100mm macro and 65 mm mpelenses I found that I achieve far superior results shooting 4 slices at f8 than 2 at f16 or 1 at...
by Borberg
21.02.2005 01:37
Forum: Helicon Focus: Macro
Topic: Accurate slicing
Replies: 8
Views: 34642

Accurate slicing

Ever wonder how many slices you have to shoot to get 1 mm of object depth at a given magnification? I use a Manfrotto macro rail which advances 1.25 mm per 360° turn of the crank. This translates into the following number of slices and turns for 5 different magnifiction factors (using the Canon mpe-...
by Borberg
19.02.2005 19:20
Forum: Helicon Focus: Macro
Topic: Dust map
Replies: 17
Views: 46009

Dust map

No matter how carefully you clean your lenses and chip there will be residual dust left, plus the drying rings from the cleaning fluid (I use Eclipse from Photo Solutions). When you use a macro lens with 1:5 magnification and view the image on a 21" monitor (320 mm high), you have a viewing magnific...