Max/Min Shutter limits
Shutter range locked to the body and lens in your hands.
Where to find it
Viewfinder Wheels; Tools tab Ranges
Summary
The shutter wheel clamps to the fastest and slowest shutter speeds your camera body and lens can handle. In Gear-based mode, a leaf-shutter lens or body focal-plane bounds override the manual sliders.
How it works
When you pick a camera body and lens, the shutter wheel stops at the fastest and slowest speeds those two pieces can actually achieve. A leaf-shutter lens maxes out around 1/500. A focal-plane SLR can reach 1/4000 or faster.
How it bounds
If you pick a 1/1000 leaf-shutter lens on a 1/4000-capable body, the wheel's top speed becomes 1/500 (the lens's limit). If you pick the same lens on a 1/125 body, the body's limit wins and the wheel tops at 1/125.
Bulb exposure
The wheel also respects whether your body supports Bulb (T mode) for exposures longer than 1 second. If Bulb is not available, the wheel bottoms out at its slowest mechanical speed, typically 1 second.
Manual override
In Ranges tab, you can manually set custom shutter limits if you want to simulate a different body or work in a restricted range.