petak, 21.10.2011.



Drapery Rod Extender

drapery rod extender

  • A substance added to a product such as paint, ink, or glue, to dilute its color or increase its bulk

  • Any of various substances designed to extend any of several properties of a material; Any of various components designed to extend the length of a device; Another term for runner or quick-draw. (from sense #2)

  • (Extenders) Low cost materials used to dilute or extend high cost resins without much lessening of properties.

  • A person or thing that extends something

  • In set theory, an extender is a set which represents an elementary embedding having large cardinal properties. A nonprincipal ultrafilter is the most basic case of an extender.

  • Cloth coverings hanging in loose folds

  • Long curtains of heavy fabric

  • curtain: hanging cloth used as a blind (especially for a window)

  • Drapery is a general word referring to cloths or textiles (Old French drap, from Late Latin drappus ). It may refer to cloth used for decorative purposes - such as around windows - or to the trade of retailing cloth, originally mostly for clothing, formerly conducted by drapers.

  • cloth gracefully draped and arranged in loose folds

  • The artistic arrangement of clothing in sculpture or painting

  • A slender straight stick or shoot growing on or cut from a tree or bush

  • any rod-shaped bacterium

  • A thin straight bar, esp. of wood or metal

  • A wand or staff as a symbol of office, authority, or power

  • a long thin implement made of metal or wood

  • perch: a linear measure of 16.5 feet

Canon Extender EF 2x II Test - Day 30

Canon Extender EF 2x II Test - Day 30

At Phil's sestion I carried out these tests. That pretty much used up Day 30 at the lake. Now I have to get back to some organizing and some quicker photo shoots.

1) Do I get better telephoto shots with a 2X extender than without?
2) How does quality depend on F-stop with these combinations?
3) Does backing off a little from the lens' maximum zoom help?

A gin bottle. I followed the lead of dpreview.com in this, after finding that a not-so-flat subject tended to get focused poorly.

1) Velbon CX 570 tripod. A little flimsy for this equipment, but I didn't extend the upper shaft which is the most flexible part.
2) Shutter lockup used for all except the hand held shots. 2 second delay from shutter press.
3) Image stabilization on. That's supposed to be okay on a tripod for these newer lenses.
4) ISO 200.
5) Natural light outdoors - in shade but well lit.
6) About 45 feet (14 meters) from camera to subject.

1) Canon 350D (Rebel XT)
2) Canon EF 70-200mm 2.8L IS USM lens
3) Canon Extender EF 2x II
4) The tripod already mentioned.
5) One bottle of gin. I don't drink the stuff, but it had a detailed label.

The tests done are mostly indicated on the image itself. The line labeled "closeup" was taken with the same lens (no extender) from a couple of meters away for reference.
Note that the "stretch" line is included to show what happens if you just use software to enlarge a 200m shot to the size of a 400m original. The "shrink" line is the reverse. If you use an extender and then shrink to 200m scale, do you get anything extra?

1) The extender doesn't help much. It gives the magnification advertised of course, but you don't see much more detail than without it.
2) Consistent exposures in this sort of test are a problem.
3) You can't beat getting close to the subject - but everyone already knows that.

Extender Study with ISO Changes - Day 33

Extender Study with ISO Changes - Day 33

Another day when those of you looking for pretty pictures will be disappointed.

Phil pointed out that since my 70-200mm lens and that same lens with a 2x extender have different best apertures, it might pay to vary the ISO to allow the longer lens to have an acceptable shutter speed.

The goal here is to find out what parameters work best with the extender, and also if the extender is worth having.

Subject: willow leaves

1) Handheld, to include the real-world effect of shutter speed.
2) Image stabilization on.
3) ISO 200 to 1600
4) F4 and F5.6 at 200mm (no extender)
F5.6, F11, and F16 at 400mm (with extender)
5) Natural light outdoors - cloudy, no shade
6) About 120 feet (37 meters) from camera to subject.
7) Slight breeze, so that the willow is not moving noticeably, but it probably moves a bit.

1) Canon 350D (Rebel XT)
2) Canon EF 70-200mm 2.8L IS USM lens
3) Canon Extender EF 2x II

I won't draw many conclusions until others have a look. One thing that does stand out to me is that the F11 shot at ISO 200 looks very good among the 400mm shots. This is surprising because the shutter speed of 1/30 second should have produced more motion blur. Maybe the tree and I were just especially steady for that one.

drapery rod extender

See also:

car shades

bravo sports quik shade weekender 64 canopy

lattice shade structure

medical drapes

crown tent and awning

remote control shutters

canon 50d remote shutter release

cheap window covering ideas

lawn swing canopy

- 07:23 - Komentari (0) - Isprintaj - #

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