I assume by butterfly you refer to the scalloped hoods made for short focal length lenses. It avoids any image cropping at short focal lengths.

These types of hoods are also known as flower, or more generally Tulip. Yes, they are intended for use with wide angles and now are found on many Zooms wide-angle to tele, such as 18 -200, 18 - 270 and so forth. At one time people carried a hood for the wide angle and when zoomed out a normal lens hood. Progress.

I think you mean that photographers used a hood for the widest angle of the zoom and it wasn't as effective when the lens was zoomed out. I can't imagine carrying two lens hoods for a single lens. Defeats the purpose of a zoom.

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At one time people carried a hood for the wide angle and when zoomed out a normal lens hood. Progress.

Many have forgotten and many did not know that lens hoods were no included with lenses as they are today. They were considered accessories and had to be purchased from the manufacturer for a particular lens. Some of the more expensive did come with hood. Minolta was one of the earliest that provided a shade that sliped out along the outside diameter even with some macros, Ibelieve. Then, beeing inovative as they were made the transition to hoods that slipped or turned onto the lens in such a manner to save space and add convenience of use.

Yep, people did walk around with two or three sometimes, collapsible lens shades, some clipped onto the outside diameter and some screwed into the filter threads. Some were adverised as multiple focal length use -- collapsible to coincide with a range of focal lengths. They are still made but many are rigid; whereas, the old styles collapsed almost flat (no wider than 3/4 inch at the maximum diameter.
Here are some of the new varieties -- somewhat similar in design, but not feature:

http://www.tallyns.com/TPP/AMAZING/items...C=colapseshades

Why would this be any different than those who carry every filter imaginable -- usually take them for a walk without ever using them?

Thanks for sharing this information. I really like your way of expressing the opinions and sharing the information. It is good to move as chance bring new things in life, paves the way for advancement, etc. But it is well known to everyone that moving to new location with bulk of goods is not an easy task to move or shift from one place to other place because I have experienced about that and I face the problem like that. There I go to village near to my city faced that problem there.
carpet stretching//

It avoids any image cropping at short focal lengths.[img]http://www.bosin.info/g.gif[/img]