Fujifilm Astia 100F color reversal (slide) film was popular among portrait and fashion photographers because of its excellent skin tone reproduction. It was known for low contrast and low color saturation, as well as having a slight warm/yellow cast and creamy highlights.
Astia would be pretty low on your list of choices for anything other than pictures of people. Because of this I only ever shot one roll of Astia 100F film.
The Astia Film Simulation on Fujifilm cameras doesn’t match real Astia film. It has far too much contrast and saturation, and the cast is more orange-red than yellow. But that doesn’t make it unworthy of your use. In fact, on the X-E1 that I used to own, it was my favorite choice and I used it probably 80% of the time.
Astia is not my favorite choice for color on my X100F. Classic Chrome is my go-to option, and I select Velvia (which has been noticeably improved) when I want something more bold. There is still a time and place for Astia, and I do use it occasionally.
Something interesting that I discovered back on the X-E1, and it is still true on the X100F, is that Astia and Pro Neg Hi are nearly identical. Put them side-by-side and it can be tough to tell which is which. Astia has just a hair more color saturation and is just a tad warmer. Adjust color by one and customize the white balance and the two options are completely interchangeable.
One thing that I like about the Astia Film Simulation is that it strikes a good balance, sort of the Goldilocks of the Film Simulation options. Not too little or too much contrast, not too little or too much saturation, not too little or too much warmth–for many situations it is just a good choice. It won’t wow you but it won’t underwhelm you, either. I think it is a better standard Film Simulation than the standard (Provia) option.
I have customized my Astia Film Simulation to my liking. It is not intended to be more faithful to the actual film. I think if you were to adjust my settings to be -2 color and take a little red out of the white-balance you would be pretty close to actual Astia film. That’s not the look I want, so I stick with my custom recipe, which I think is better than Astia film ever was for things other than portraits.
Dynamic Range: DR200
Noise Reduction: -3
Grain Effect: Weak
White Balance: Auto
ISO: Auto up to ISO 12800
Exposure Compensation: +1/3 (typically)
Example photos, all camera-made JPEGs captured using my Astia Film Simulation recipe: