Irix'in sitesinde rastladım ve daha önce bilmediğim bir bilgiydi! :o
(Bu bilgiyi 'Uzun Pozlama' başlığı altında paylaşmıştım, ancak bu u bilgiyi çekim teknikleri altında ayrı bir başlık olarak paylaşıyorum ki, kayıp edilmesin.)

Bonus Tip:

Use the rule of 600!

This rule concerns the apparent movement of the stars in the sky caused by the rotation of the Earth and trying to avoid the effect of moving stars.

This rule is really simple to use: the ‘’600’’ should be divided by our focal length, and the result will be the maximum exposure time with no visible movement of the stars.
For example, the lens that we’ll use is the Irix 15mm f/2.4, so we divide 600/15 = the 40s. With such a long period and bright optics (f/2.4) we can use the lowest possible ISO value, thus not only reducing the noise but also allowing our camera to record images with a wider dynamic range, which is really handy when, afterwards, we begin to post process our images.

Author:
Piotr Tomala
Irix Brand Manager

Referans: The Irix Edge Light Pollution Filter : My Irix


Bilginize.