Please clarify you above statements a bit. Are you speaking from personal experience/test or just a 'educated guess'? Thanks.I think I would put myself in OzRay's corner on this discussion. Although it is feasible to use a longer hood since the effective lens focal length is doubled, the hoods that have been designed for the lens were made to best cover the lenses full front element. It is possible a longer hood could affect the characteristics of the light entering the lens without vignetting occurring, since the purpose of a hood is to eliminate stray light from entering through the front element. If you eliminate the light entering from the lens edges (which would still travel through the center of the lens), it could affect the characteristics of the final image produced - you may not see obvious signs such as vignetting, but the color characteristics (admittedly a subjective, more intangible part of an image!) could also be affected.
Educated guess, makes sense to me. As I stated it is a completely subjective discussion anyway, I doubt there would be a way to quantify such ideas.Please clarify you above statements a bit. Are you speaking from personal experience/test or just a 'educated guess'? Thanks.
P.s. It will be nice to see an example of a long hood having a negative impact on an image.
Really? Quantify good Bokeh for me then. You can't, its subjective! You can only define the word, not what any one person would call good or bad.if you cannot quantify an effect, the effect does not exist.