On Wed, 08 Jan 2003 09:21:17 +0000, Moldy <elim(underscore)oldman@hotmail(dot)com> wrote:

>I have just got a screw in hood for a lens on which I mount a UV

>filter. Which order should I place the filter and hood.

>

>Lens | Filter | Hood - Will this cause vignetting?

>

>or

>

>

>Lens | Hood | Filter - Will the added distance between the front

>element and the filter affect the picture?

>

>The lens is 28mm focal length with a 52mm filter size if this is of

>any relevance

Lens | Filter | Hood - otherwise, the filter is not

shaded or protected. Whether or not the combination

will vignette depends on the design of the lens, the

thickness of the filter rim, and the design of the

hood (the hood is the most likely to introduce

vignetting). If your camera has DOF preview, you can

easily check for vignetting by focusing to infinity with

most short lenses, setting the aperture at the smallest

stop possible, and while holding in the DOF preview

button, look at a bright subject area placed in a

corner of the VF to see if the corner is darkened.

If you VF does not have nearly 100% coverage, though,

this will not be definitive (moving a finger around

the edge of the shade extended very slightly inside

the shade edge while doing the checking can indicate

if there is a likely problem). If this is too awkward

or impossible, shoot one picture of a smooth-toned

subject occupying the entire frame, with focus at

maximum and with the lens at the smallest stop.

BTW, if the 52mm filter will fit onto the hood, it

is likely the shade will vignette in any case with a

28mm lens for 35mm format, unless the lens front

element is considerably smaller than the 52mm

filter ring...