Canon EF-S 55-250 IS STM or EF 70-300 IS II USM for a trip to South Africa

I understand that the latter is a slightly better lens, but it's almost twice as expensive. Is it worth it for the additional 50mm, USM and build quality?

The focus is faster, right. Only you can answer if it's worth the extra cost. The build quality is not weatherproof so I would not call the build quality much higher.

The extra 50mm may not matter, as the image quality of full-frame lenses is typically slightly worse when used on crop bodies than with full-frame lenses. Therefore, an image taken with the 55-250 at 250mm may be almost as good as an image taken with the 300-300mm 300-300, even when extra trimmed.

If you plan to use the lens only during this safari and live in an area where renting a lens is an option, you should rent some of the better lenses like Canon 100-400 or Canon 400 prime. I do not know how big the planned animals are and how far away they are. I would choose the Canon 400 prime for small animals like birds and Canon 100-400 for big animals.

Well, of course, if you're planning on taking photos of wildlife more often and are not ready to buy an expensive lens, the 55-250 and 70-300 lenses may be a good choice. I would also add a third-party 100-400 lens like the Tamron 100-400 lens. Third-party lenses sometimes have compatibility issues (example: My Tamron 100-400 had problems with Canon EOS RP), but it often fixes newer firmware (example: My Tamron 100-400 with the latest firmware works fine with Canon EOS RP). ,

My experience with shooting 55-250mm birds is that I used it all the time at 250mm. At least for birds, a lens with 100-400 could be a better choice.

A good middle ground could be to hire a lens that you can afford if you like it. For example, rental of lenses offers Tamron 100-400. The Tamron 100-400 is weatherproof, unlike the Canon 55-250 or Canon 70-300. In addition, the Tamron 100-400 has a focus limiter, unlike the Canon 55-250 or Canon 70-300.

Extension of the visa for South Africa for 90-day visitors?

I am a Canadian who will travel to South Africa next year to join my partner (also Canadian), who will study for this year. I will work remotely, but without a work visa, so I plan to leave the continent to renew the visa about every 90 days. This seems to be a viable (albeit expensive) strategy based on other answers I've read here. However, I have some questions about this:

1) Can I get a new 90-day visa by re-entering the correct date of my country of residence if I have already requested / used a 180-day extension? In other words, if I get an extension, use it and leave at the right time, can I get another 90-day visa on re-entry?

2) If I leave the continent before my 90-day visa expires and then return within the same time frame (eg after 60 days), will I get a new 90-day visa? Or will I have 30 days left in this case? I know that this is the norm for re-entering after visiting other African countries, but what about leaving the continent and returning?

math – Computes elevation, radius, and theta length relative to aspect ratio in Africa

problem
Hi everyone, as the title suggests, I try to render an aframen a-curvedimage,
I have the following values ​​from a dynamic data source.

    computedX: -365,  //computedX: x + width / 2 - parentArtboardWidth / 2 (centering x origin)
    computedY: 737,   //computedY: -(y + height / 2) + parentArtboardHeight (centering y origin for aframe)
    height: 350,
    name: "white plane",
    parentArtboardHeight: 1080,
    parentArtboardName: "01",
    parentArtboardWidth: 1920,
    parentInstanceOf: "Artboard",
    width: 686,
    x: 252,
    y: 168,
    zIndex: 3

Now the values ​​work exactly, I want them to work, but with a flat picture. But I need them to bend height radius and theta-length in relation to image aspect ratio,
I know how to calculate that image aspect ratio but how can I calculate the remaining values?
Here is a Codesanbox. Do not hesitate to try it yourself.

Note that you need to navigate if you want to change the pictures from flat to curved line 189 and put showCurved to true or false,
Expected issue: I expect to warp the elements a bit, but without disturbing the x and y coordinates. Currently the coordinates are not correct a-curvedimage although the computedX computedY Values ​​work perfectly in flat images.
Further information

In the codesanbox (https://codesandbox.io/s/zealous-volhard-7y2g1) you can try this problem yourself:
Line 189 There is a variable showCurved you can adjust to true false switch between a-curvedimage and a-image,
– The formulas are a mess right now, but they are on Line 189 to Line 219,
a-image Entities are generated from Line 234 and a-curvedimage Entities are generated from Line 249,

My ultimate goal is to display elements in a curve (the current curve amount is okay), but to put them in the right position, as they are in a plane.

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