The house in Almaden Valley was a 1964 Eichler — flat roof, floor-to-ceiling glass on the garden elevation, post-and-beam construction with exposed fascia and no eaves on the south side. I was shooting the living room for a listing in June 2023, and the south-facing glass wall was full of 10 a.m. summer light. The interior was about four stops darker than the window. That is not a photography problem; that is every real estate photographer’s standard challenge in a California Eichler. But for inspection and documentation photography — where both the interior detail and the window view matter as evidence — the four-stop difference is the whole problem, and you cannot sidestep it with a plug-in.
Understanding the exposure problem
A modern mirrorless sensor has 10 to 14 stops of dynamic range. A room with a bright exterior window can span 5 to 8 stops from the darkest shadow to the sky beyond the glass. On a sunny day through south-facing glass, that can exceed 10 stops — at or past what a single exposure can hold.
The options: expose for the interior and blow the window; expose for the window and lose the interior; shoot multiple exposures and blend; or change the light so the range is manageable. For a listing, a blown window with a pleasant interior exposure often reads fine. For documentation — where a water stain near the window or a crack in the glass frame needs to be readable — a blown zone near the damage is a problem. The National Institute of Standards and Technology publishes imaging standards relevant to documentation photography covering dynamic range, exposure consistency, and evidentiary accuracy.
Practical exposure choices for documentation interiors
For inspection footage in bright-window rooms, I use two strategies. If the damage is away from the window, I expose for the interior at f/5.6 to f/8, ISO 400 to 1600, and let the window blow. If the damage is near the window — a leak stain at the glass-to-frame junction, a crack at the corner of a pane — I shoot a bracket: one exposure for the interior, one for the window, one at the midpoint. The bracket gives three files covering the full range without blending.
HDR blending is legitimate for listing photography. For documentation I avoid it unless I label the blended image clearly as a processed composite and include the originals. An HDR image is a derived document; in a dispute, the unprocessed originals carry evidentiary weight.
Supplemental light versus window management
Adding light reduces the window-to-interior ratio. A 600-watt-second strobe bounced off the ceiling can bring the interior up by 2 to 3 stops, cutting the effective dynamic range from 7 stops to 4 or 5 — what a single exposure can handle. I use this for rooms where I need to document multiple elements and cannot bracket every frame.
Alternatively, reduce the window light: translucent diffusion film taped over the glass cuts transmission by 1 to 2 stops. But the simplest solution in Almaden Valley in June is to schedule for late afternoon. By 4 p.m. the sun has moved off the south face and the interior-to-exterior ratio drops from 6 stops to about 3. A single ISO 800 exposure handles it without supplemental light or HDR.
Interior links between the two problems
Dark corners and bright windows are the same problem from opposite ends of the tonal range. I handle dark corners with a second light: a bare LED panel at 45 degrees behind the camera’s lens axis, set 2 stops below the ceiling-bounce strobe, fills the shadow zone without flattening everything. In documentation photography, some shadow is an asset — it reveals surface texture. A fill that eliminates every shadow also eliminates the texture you are there to record.
The case study on humidity, veneer and close-ups: documenting custom millwork in Miami covers the related challenge of shooting high-contrast veneer surfaces in a mixed-light interior — the same window-versus-subject problem applied to a different material.
Frequently asked questions
How do I expose correctly when there is a bright window behind my subject? Decide what must be readable in the final image. Expose for the interior at f/5.6 to f/8 and ISO 400 to 800 if interior detail is the priority. Shoot a bracket of three exposures if both the interior and the window view need to be documented. For inspection documentation, include all bracket frames in the file rather than selecting only one.
What is the easiest way to reduce the exposure gap between a dark room and a bright window? Schedule the shoot for late afternoon when direct sun has moved off the window face, or add a ceiling-bounce strobe to bring the interior up. Both approaches require no post-processing and produce a single-exposure result that is unambiguous as a document. Translucent window film is a third option if the exterior is accessible and the owner permits temporary application.
Should I use HDR for inspection or damage documentation photos? Generally no. HDR is a processed composite that can look more informative than any single exposure but carries less evidentiary weight in a dispute. Include all bracketed originals in the documentation file and label any processed images as composites. If you must use HDR, keep the tone-mapping subtle enough that the result looks like a real photograph, not a processed rendering.