Friday, October 17, 2008

Can You Get Foot And Mouth Twice

DRAWING TUTORIAL: LIGHTING (Part I) SLEEP ASTRONOMY II

To capture as much detail on an object is important to maintain proper lighting. Although it is red, if excessive could also lose vision capability. When we are in the field of observation generally use the red LED flashlights that fit on the forehead to keep your hands free. But unfortunately some of them are too strong and become annoying, especially when someone that looks at you wearing it and accidentally blinds you.


Some have combined red, white and clear, as Murphy is always lurking near the astronomer, when you try to turn it on does not succeed with the active and the white light being blinded with your classmates. The easiest is "caparla" to only work on so red.


This type of lighting is sufficient when we are not going to make a field that requires a lot of darkness, as the planetary observing or astrophotography, moon ... Now, when we want to do is to observe objects weak as nebulae and galaxies, things must change. Lighting should be minimal or absent for a flawless dark adaptation. If we have prepared well from the previous day for proper chemical adaptation of the retina (not much exposing to light during the day and taking care of the food) will be ready to get the most out of deep sky observation.

As always we need some light to manage in the dark and read the maps it is advisable to a small low-intensity LED flashlight, if adjustable better to leave it to a minimum. You would be surprised what we can do with so little light. With

pair of LEDs is sufficient, this example is home and is the most used in the field. I call it the "demon" because at night you can only see two red eyes:


To draw the base placed on the drawing and pointing it subtly illuminate the area of \u200b\u200bthe circle. But this method is not the best because too much light is wasted, this is lost on the sides and not concentrated in the target zone.

It is best to get a light that focuses solely on the circle. For this we use an LED light bulb equipped with a gooseneck support will enable us to direct light to the area you want, and finished in a clip that we use to attach your notebook or folder. Thus:


This light is ready to work as hard as plugging into an outlet in the country with batteries, and the best is also ready to adjust the intensity. Anyway the important thing is that we get the desired result: an illumination adjusted to the contour of the circle (what with the "demon" did not get):



Because this LED lamp provides a white light going to use the typical transparent red cellophane so often helps us although any material provided that it gives us the desired result:



As you can see the light focuses "only" within the circle and it is red to draw without dazzle.

Whether you work with a LED type "demonized" as if we use a more focused light what is really essential is that the light is dim, it is not intense, it would ruin the work and we would see little detail in the observed diffuse objects.

I hope these tips ... enlighten you and you can achieve the perfect balance of light to further enjoy your nights astronomical observation and drawing.

Ah! if anyone is interested I am posting a picture of the lighting equipment with the controller and battery.



Good heavens ... sticks and Murphy! Ana Leonor Hernandez

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