Ultra-wide, a level camera, and patience with interiors. Verticals that lean are a tripod problem, not a Lightroom problem you should have to fix every time.
Get the whole room in, and get the camera level. Those two beat a tilt-shift until you are shooting buildings for a living.
Interiors and tight facades need more than 24mm. 14–20mm on full frame (10–14mm APS-C) is the listing-photo range. Watch the edges: cheap ultra-wides stretch faces and furniture, so stop down and step back when you can.
What to look for: 14–24mm class on full frame, reasonably corrected, a filter thread or a holder if you want a CPL. Tilt-shift is a later, specialist buy.
Real estate interiors are often 0.5–2 second exposures, and architecture needs a level camera so verticals stay vertical. A leveling base or a head with a long bubble is faster than correcting every frame.
What to look for: A stable tripod, a head that panos on a level axis, and enough height to shoot over furniture. A geared head is a luxury, not a requirement.
Confirm level on the camera, and lift dark interiors without blowing windows if you can.
The electronic level in the camera is easy to ignore. A $10 bubble on the hot shoe is always in your eyeline when you are under a wide lens. Level once, shoot the bracket.
What to look for: A two-axis hot-shoe bubble. Plastic is fine.
Bouncing a flash into a ceiling lifts a dark living room so you are not pulling four stops of shadows. It is not a substitute for window-pull HDR, but it is a faster single-frame listing shot.
What to look for: TTL, a tilting head, a diffuser. Same Godox TT685-class light as the portrait kit.
Skip it if: you already bracket every interior and blend in post. Flash is optional then.
Glass and water are polarizer problems.
A polarizer cuts reflections in windows and on polished stone so the interior (or the building behind the glass) is actually visible. Rotate it while you watch the reflection die.
What to look for: A slim CPL in the ultra-wide’s thread — thick rings vignette at 14mm.
Not for listings and most architecture. A level tripod and a modest crop (or the lens profile) handle it. Tilt-shift is for when you are paid to keep every column perfect at 17mm.
Both work. HDR/bracketing is more common for window pulls. A bounced speedlight is faster for empty rooms with moderate windows. Use whichever you will actually process well.
When furniture looks stretched and rooms look bigger than they are in a dishonest way. For real estate, stay honest: step back, go a bit longer, or take two frames.
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