Floating mountain

Aw I see the framing issue you had.  hm, I would probably just stick with the black, but yeah, it's not perfect.
Sorry.

Seems black is the given choice for borders, however, with a key middle gray as a 1 pix border and then a White matt, you just might see something different.

Nicely captured.

Just a side note, the sunny 16 rule is calculated from a Bright sunny day (Noonish) no clouds, from there, the photographer adjusts accordingly either in -stops or +stops, by combinations of shutter ISO and aperture or go with just the aperture, ISO or shutter.
The neat thing is once the shutter and aperture scales are memorized, when shooting in the shade, the photographer will be able to say such and such as a starting point.

When I shoot animals or even models and have that bright day, I intentionally as I'm walking set the camera at 1/500 f/8 ISO 100 that's my starting point and adjust from there, in 3rds.

So, if you write down the scales and see what I have done, you'll say, I wanted F8, the question is what will be my shutter speed? as you see, 500.

Anyway, just thought maybe I would share and hopefully in future shots, I'll see your combinations varied.

Beautiful view

On knowing your fstops and shutter speed?

F stops
1.0-1.4-2.0-2.8-4.0-5.6-8.0-11-16-22-36

Shutter
1-1/2-1/4-1/8-1/15-1/30-1/60-1/125-1/250-1/500-1/1000-1/2000-1/4000-1/8000

So, what tute do you need now.

Now that you know the f16 rule above this post, I want to shoot at f/4.0, what's my shutter speed?

The rule is

ISO 100  1/125 @ f/16
ISO 200 1/250 @ f/16

And so on as you see by the table above.

So, ISO 100 _____ @ f/8.0 fill in the blank

So let me see if I understand this right.

Based off of the example above in Bold.  ISO is the amount of light the sensor picks up so at 100 it is letting in the least amount of light.  Your shutter speed is faster to reduce the amount of exposure time and the f/16 is the focal length ratio of the lens.

Then to answer your question it should be 500 (not because I read it above) because your focal length is shorter which allows in more light so you want a faster shutter speed with the lowest ISO to produce a picture that isn't over/under exposed.

How did I do?

Yeah, and now I know how to shoot in low light situations.  Sadly I admit I have been using the auto setting on the camera and using it as a point and shoot (I have been busy/lazy and haven't read the manual.)  I just looked this up so now I have a better understanding of it and will practice tonight (the wife and I are trying to go 30 days without watching any TV, so if I seem stressed you know the reason.)