They do the best they can.

Currently the largest optical telescope is "The Great Canary Telescope" (Gran Telescopio Canarias) in Spain, it has an apeture of 10.4 metres. There is an optical telescope under construction in Chilie that when completed will have an apeture of 21.4 metres, called the Giant Magellan Telescope. The largest single dish apeture radio telescope is the Arecibo Radio Telescope in Puerto Rico which is 305 metres.

PSH 11 M1 Cabrine or fg 42 with scope actually i would use the mp40 with apeture

It is difficult to determine which aperture gives you the best resolution when focus-stacking without knowing which lens you are using. You will have to experiment to find the one best for your lens. The smallest aperture that works with your lens is the best one to use.

The name of the Corel program that is used in photo editing is called Corel Draw or Corel Paintshop. Some other photo editing programs are: ACD Systems, Adobe Photoshop Lightroom 4, Apple Apeture 3.

To find the aperture of a reflecting telescope, you would measure the diameter of the primary mirror. The aperture of a telescope is the diameter of its primary light-gathering element, which in the case of a reflecting telescope, is the primary mirror.

Tripod the camera, aimed at where you know the fireworks will take place and leave the shutter open (timed exposure). The light exposes the film (or records in the electronic camera) but the dark obviously doesn't. The apeture should be a high F-stop to increase depth of field. You'll need to experiment with the time.

At the bottom of the srt-100 there is a little dial that has three settings B.C/OFF/ON be sure you have working batteries and have the dial set to ON. I still don't know what B.C is for. When you look through your viewfinder the needle should now be moving depending on the amount of light that is entering the lense. All you have to do is move the shutter speed or apeture to make the other dial with the circle match up with needle and you have your exposure. Remember to consider what you are looking for in the picture you are taking. If you want depth of field, set the desired apeture for the desired affect, low number for a shallow depth of field, and only adjust the shutter speed to get your exposure and vice versa. Hope my answer has helped :) I'm still searching the web for a manual, I don't know what the difference is between the B.C setting and the ON setting is. BC is for checking the condition of the battery for the light meter!!

Concave mirrors can enlarge images because they can focus light rays and converge them at a point, creating a magnified image. This is due to their inward curved surface that allows them to reflect light in such a way that the image appears larger than the object.

Focal length is directly related to the format of the system and the print size. Since the print size aspect is not markedly significant, I will not delve into it here. For the 35mm format, then, the "normal" lens (whereby the viewfinder image appears to be the same size as the subject) is around 45mm. Shorter focal lengths allow you to move in closer and they provide more depth of field. However, as you approach 28mm, distortion in the form of convergence appears in any plane that is not parallel to the film (or CCD in the case of digital photography).

The longer the focal length, the greater is the minimum distance that you must maintain from the subject. Also, the depth of field decreases as does the field of view. The maximum apeture of a long lens also decreases, and in fact, there may be two markings for the maximum apeture if the lens is a zoom of sufficient range.

For medium format cameras, the normal lens will be in the range of 80mm (again, depending on the format dimensions), and for 4x5 cameras, the normal lens is around 200mm.

If you already know all the technical things needed to play the flute then yes. It is just a little more difficult because it takes more breath support and it requires a tighter mouth positioning. The opening in the mouth (aka apeture but i cant spell it) needs to be substantially smaller and the lips much tighter. Other than that its pretty much a breeze. Be aware though that the super high notes do cause headaches

It is a technique that maximizes the depth of field by rendering more of the foreground in focus than would ordinarily be achieved when the lens is set to focus on infinity (when the focus is turned to the maximum distance). Consider that depth of field is defined as the distance from a foreground point to a background point that is rendered as acceptably sharp (it cannot truly be a distance "in focus" as some would say since it is only possible to focus on one plane). If you really understand depth of field scales on the lens barrel, you should be able to comprehend that it should be possible to have the far point fall just on infinity rather than seemingly extend beyond it.

Hyperfocal distance is achieved by lining up the centre of the infinity mark on the focus scale with the indicator line for the apeture being used for the shot (the one at the far distance end of the aperture scale, not the near distance end of the scale). The foreground point of acceptable focus is then estimated by observing the reading on the distance scale that lines up with the other aperture indicator line I just referred to. Of course, when you look through the view finder, neither the near point or infinity will appear to be acceptably sharp if you are viewing at full aperture. The effect can only be pre-viewed if your camera can stop down the lens to the f-stop being used for the shot without taking the shot. Naturally, this effect is not worth the effort unless you are going to take the shot F11 or F16 or an equivalent for the film format you're using.

Micron

A rule of thumb is to think that if you focus on the hyperfocal distance you will be in focus from half the hyperfocal distance to infinity. Few zoom lenses have depth of field scales (the Tamron 80-200 is one), so you would have to rely on depth of field charts.

I used it many times with fixed focal length wide angle lens on a roll film Mamiya 120 slr. I set the infinity mark in the f22 position on the lens and found I had a depth of field that stretched from two feet to infinity!