My thanks for the vlisit Mike.
As for the different focal lengths of lenses - when you move your arm in and out (like the Trombone Slide) you put in more or less of your subject. Both the main opening and PEEP HOLE work this way. Doing this reminds me of uisng wide angle to tele lens. Doing this is much easier than using the weight of a a long lens - especially - to frame a scene first. Mysefl, I CANNOT EYEBALL my FINAL COMPOSITION without it. One thing I like here - I am able to work -for as long as I want without a cam - if I just want to STLUDY ONLY how to PORTRAY A SUBJECT without thinking of a cam.
Along with that, I am able to use the small PEEP HOLE to ISOLATE SMALLER AREAS of a SUBJECT to STUDY LIGHT VALUES which help in JUDGING EXPOSURES. Since I started using this PEEP HOLE, I found thlis most helpful - especially if I - need or do not need - to assess - whether to add or reduce light in small parts of a subject. A V. C. PEEP HOLE is a real help for this - unless a person walks up to a subject with a MAGNIFYING GLASS.
The 3 1/2 x 3 1/2 viewcatcher is constructed of durable plastic to hold up to the elements and provide years of use. Pulling out the slider gives you a 3 inch SQUARE opening. V C'S SLIDER DOES NOT PULL RIGHT OUT of the FRAME. It is colored a #5 gray to help judge value and has a small sight opening in the center that enables artists to see "true" color. It can be held at different distances and the adjustable opening can be oriented horizontally or vertically to help find just the right composition.
Even on the P C SCREEN - I am able to use these ildeas for the same pruposes in making my final decision in my COMPOSITION.
Here is a link - showing one side of the package for it -
http://www.jerrysartarama.com/discou...ew-catcher.htm