Overall lens length differences
Geez mate - it's been over 50 years since I did Photographic Optics as part of my tertiary studies
Originally, all "big" lenses were regarded as 'long' lenses. ie: a 400mm lens was 400mm long, until post-war maths allowed better designs and glass compounds, when the industry was able to shorten the physical length via better optics. With the telephoto design of lenses a 400mm lens became around 300mm long ~ and we loosely refer to all lenses today as being a telephoto lens without realising what it really refers to
As to the Aperture and its possible variability during zoom operations, I do not think that it is an issue. For example - someone using a 100mm macro set to F11 should have the same image brightness as the user of a 70-200 zoom at the 100mm setting and also using F11
If this were not the case, the outcry from users world-wide would kill off zoom lenses ~ surely?
Hope this helps
Phil from the great land Downunder
www.flickr.com/photos/ozzie_traveller/sets/
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