Minimum Aperture vs Focal Length Range

[astroNikon]

It gets more complex as you learn more.

Wait until you get to the question of how your background blur is especially balls of light, and how many and types of aperture blades in the lens affects this.

 

[chuasam]

Telephoto lenses compress the image.

 

[Ysarex85 80]

Telephoto lenses compress the image.

No, they don't. What you're calling image compression is the perspective that results from being farther away from the subject. It's not a function of the lens focal length it's a function of being farther away. It's common to use telephoto lenses to photograph distant subjects and so it's a common misunderstanding to assign causality to the lens.

Joe