Month: May 2024

Market cap

Jovan Stosic May 21, 2024

Market capitalization, often abbreviated as “market cap,” is a measure used to assess the total value of a publicly traded company. It’s calculated by multiplying the company’s current stock price by the total number of outstanding shares. In essence, market cap represents the theoretical cost of buying all of a company’s outstanding shares at the current market price.

Market cap is widely used by investors and analysts to gauge the size of a company and its relative importance in the financial markets. It’s also used to categorize companies into different classes such as large-cap, mid-cap, and small-cap, which helps investors understand the risk and growth potential associated with investing in a particular company.

https://chatgpt.com/?oai-dm=1

Market cap was last modified: May 21st, 2024 by Jovan Stosic

Euler Function

Jovan Stosic May 19, 2024

The Euler function assigns to any natural number d another natural number, called φ(d). This is the number of integers between 1 and d that are relatively prime with d; that is, have no common divisors with d (apart from 1, of course). For example, take d = 6. Then 1 is relatively prime with 6, 2 is not (it is a divisor of 6), 3 is not (it is also a divisor of 6), 4 is not (4 and 6 share a common divisor; namely, 2), 5 is relatively prime with 6, and 6 is not. So there are two natural numbers between 1 and 6 that are relatively prime with 6: namely, 1 and 5. Hence the Euler function of 6 is equal to 2. We write this as φ(6) = 2.

Euler Function was last modified: May 19th, 2024 by Jovan Stosic

Clarification on Spot Meter

Jovan Stosic May 7, 2024

Thanks for your responses!
Ok,  yesterday I did a quick test.  Using Canon’s meter I exposed a gray card for normal exposure, so Zone V (not shooting RAW). I switched to ML spot meter and the reading was 49.  I did the same comparison up and down the scale and got the following:
1. (-3) Zone II = 11%
2. (-2) Zone III = 20%
3. (-1) Zone IV = 34%
4. (0) Zone V = 49%
5. (+1) Zone VI = 69%
6.(+2) Zone VII = 83%
7. (+3) Zone VIII = 96%
Then I re-read the article by Gisle Hannemyr (ftp://http://dpanswers.com/content/tech_zonesystem.php) and noticed that he has the percentages that correspond to the various Zones and my numbers come very close to his.  I think this shows that the proper reading for a gray card (18% reflectance), in order to place it on Zone V, should be 49/50%, the middle of the scale, and not 18%. I think the reason for this is that a camera meter is measuring tonalities, not actual reflectance.  When I think about it, if a meter is going to measure the percentage of reflectance an object has, it would have to know the strength of the light source.  So I think that the scale 0% to 100% simply represents the tonal range from black to white (much like 0-255), not the actual reflectance of an object, and we expose any given object in a way to place it where we want it on that scale.

https://www.magiclantern.fm/forum/index.php?topic=15830.0

Clarification on Spot Meter was last modified: May 7th, 2024 by Jovan Stosic