astrophotography – Sony e-mount choice of photo lenses

You probably do not want to use noise reduction in astrophotography because algorithms can think of stars as noise!

Generally, when you choose a lens for astrophotography, you want a short focal length and a large aperture simultaneously. You can calculate an "astrophotography index" for lenses, and this index should be as low as possible. The index is:

I = f * N2

where f is the focal length and N is the opening number. Example: The index is 141.12 for Zeiss and 80 for Tokina. So, you should get the Tokina because it captures 76.5% more light, so you can use 0.57 times the ISO you use for Zeiss. Lower ISO, less noise.

BTW, according to this index, the Samyang 14mm f / 2.8 is worse than Tokina 20mm f / 2.0.

More information: https://www.lonelyspeck.com/lenses-for-milky-way-photography/ – note however that their "ranking" (which should be high, not low) is calculated at the # 39, using a different formula so that numeric values ​​are not comparable.

Justification of the index formula: opening opening in units of length squared (proportional to2/ NOT2) and the field of view in units of angle squared (proportional to 1 / f2) indicates how much you can collect light. However, the maximum exposure time is proportional to 1 / f because you do not want star trails; the light collection capacity is therefore proportional to 1 / (f * N2), you will want as high as possible 1 / (f * N2) or in other words as low as possible f * N2.

Convex Optimization – Proven Subspace $ V = C-x_ {0} = left {x-x_ {0} | x in C subseteq R ^ n right } $ associated with the affine set $ C $ does not depend on the choice of $ x_0 $

Subspace $ V = C-x_ {0} = left {x-x_ {0} | x in C subseteq R ^ n right $ associated with the whole affine $ C $ does not depend on the choice of $ x_0 in C $, that is to say. $ V $ are the same regardless of $ x_0 $

My essay:
For $ V_0 = C-x_ {0} = left {x-x_ {0} | x in C right $ and $ V_1 = C-x_ {1} = left {x-x_ {1} | x in C right $
assume $ v_0 in V_0 $, I'm trying to show that $ v_0 + x_1 in C $but I do not know how to show it

A clue?

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Inexpensive or expensive brushes / Art suppliers

Inexpensive or expensive brushes / Art suppliers

+ Answer the thread

  1. Inexpensive or expensive brushes / Art suppliers

    In quality and price, the best watercolor brushes can be those ranging from a sealed business package of up to five, hanging at the end of the driveway of your national hobby chain, to those benefiting from a royal seal, such as "By Command, to Her Majesty the Queen". (Queen Victoria commissioned Winsor & Newton to become her favorite size in the Round 7 Kolinsky Red Sable series.) The first choice could be used for a short time to clean a child's boots. in your locker room. The latter can be framed proudly on the wall of your studio. Between the two, you will find a wide choice of brushes usable by recognized brands. Some of these brands are: Winsor & Newton Series 7, Isabey, Rafael, Arches, Escoda, Pro Arte and others. The less important, but still quite usable ranges include: Winsor & Newton 666 Series, Princeton and Grumbacher. I recommend buying a good brand. Avoid these multiple packages; they will work so poorly in practice and sustainability that you will be very discouraged. Some of each brand are mentioned and I appreciate each brush. And yes, I bought cheapo brushes in the past … and I had to throw them away.


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I create a game, how to implement the function of choice of time [pendente]

I need in my game a menu function in which the player chooses a game time of between 1.2 and 3 minutes. Copper game

Filter randomly 1700 social signals in 6 days from 4 sites of choice for $ 5

Filter randomly 1700 social signals in 6 days from 4 sites of choice

All SEO experts know at least 99% of the time needed to rank websites and videos

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How to automatically fill in the drop-down menu of the choice of the image

I have an ecommerce site using magento 2.
I have a product with several color options. I've been able to configure the drop-down menu to switch to the appropriate images when the color is selected, but I also want to automatically populate the drop-down list from the moment the photo is selected.
No advice?

airlines – The best flight choice for those who suffer from reflux

Someone is suffering from severe reflux and is following a very boring diet that excludes anything that is spicy, fried, greasy, and so on. What is the best meal option to choose from in-flight meals that one can order in advance before the flight? Do all airlines offer the same choice or can it be specific to an airline?
The flight is with Qatar: Sydney to Doha.

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