How to shoot the sky in transit of venus, how to use Nikon D90 SLR camera, how to set the aperture and shutter, and what other instruments are needed?

First of all, there must be a telephoto lens. According to experience, when shooting the sun or the moon, the imaging size on the sensor is 1% of the focal length of the lens, and the sensor of D90 is 23.6 *15.8 mm. According to this estimation, the diameter of the sun irradiated by the lens of 1200mm accounts for 76% of the picture width. Therefore, if you want to show transit of venus, the longer the focal length, the better, and the minimum should not be less than 800 mm. ..

Second, there must be a tripod, because when shooting celestial bodies with a telephoto lens, jitter has a great influence on shooting, and it is impossible to be stable without a tripod.

Third, the release of the cable, like a tripod, is to prevent the action of pressing the shutter from affecting the image clarity.

4. Gray-scale mirror (ND mirror) or Budd film plays a dimming role. The larger the number marked by the ND mirror, the greater the dimming effect. There is a simple formula, assuming that the shutter speed of normal exposure of your camera is T, without adding nd, then under the same light conditions, aperture size and iso, the shutter speed of normal exposure is T * X, and this X is the number marked on the back of nd lens. For nd4, x=4, and for nd8, x=8. However, Nd has an influence on the color temperature, and the larger the number, the more obvious it is. Therefore, it is not the best way to eat ND every day, so use Bud film.

Shooting parameters:

Use spot metering to minimize the sensitivity, adopt aperture priority mode, and adopt the appropriate F/ 16-F/32 aperture according to your lens (some lenses will cause diffraction if the aperture is too small).