22
Jan
Bellows Extension Factor. Customize your Chrome homepage and make it work for you. Bellows Factor is nothing more than an adjustment to compensate for this effect. If the bellows is shorter than the focal length of the lens expose without compensation. At 04X magnification bellows draw 14 x focal length and exposure compensation is 2x or 1 fstop.
1122012 Please try again later. Bellows Factor is nothing more than an adjustment to compensate for this effect. 075 - bellows draw is 175 x focal length of your lens and exposure compensation is 3X or 15 additional stops. 492008 for example if your light meter says the exposure is 2 seconds f32 at ISO 100 if your bellows is extended 10. Apr 6 2008 3 christopher walrath No longer a newbie moving up. Or a foot it becomes 4 seconds f32 at ISO 100.
My 210 mm lens is at infinity when the lens and film planes are separated by 825.
Customize your Chrome homepage and make it work for you. For example extending the bellows to twice-F to focus for an object-to-image ratio of 11 the FACTOR will be 4. This gives you your actual working aperture. You can also use a metric measurement it does not mater. If the bellows is shorter than the focal length of the lens expose without compensation. This will give you the factor by which your bellows are drawn.