Relative difficulty: Medium-Challenging (low 7s)
Word of the Day: ISO (32A: Camera film speed inits.) —
Film speed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system. A closely related ISO system is used to describe the relationship between exposure and output image lightness in digital cameras. [...] The ASA and DIN film speed standards have been combined into the ISO standards since 1974. // The current International Standard for measuring the speed of colour negative film is ISO 5800:2001 (first published in 1979, revised in November 1987) from the International Organization for Standardization (ISO). Related standards ISO 6:1993 (first published in 1974) and ISO 2240:2003 (first published in July 1982, revised in September 1994 and corrected in October 2003) define scales for speeds of black-and-white negative film and colour reversal film, respectively. // The determination of ISO speeds with digital still-cameras is described in ISO 12232:2019 (first published in August 1998, revised in April 2006, corrected in October 2006 and again revised in February 2019). // The ISO system defines both an arithmetic and a logarithmic scale. The arithmetic ISO scale corresponds to the arithmetic ASA system, where a doubling of film sensitivity is represented by a doubling of the numerical film speed value. In the logarithmic ISO scale, which corresponds to the DIN scale, adding 3° to the numerical value constitutes a doubling of sensitivity. For example, a film rated ISO 200/24° is twice as sensitive as one rated ISO 100/21°. // Commonly, the logarithmic speed is omitted; for example, "ISO 100" denotes "ISO 100/21°", while logarithmic ISO speeds are written as "ISO 21°" as per the standard. (wikipedia)
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Found the NW extremely hard, as TOOT was first HONK then BEEP (again, "TOOT" for a horn honk feels olden). Is the "station update" in 4D: Subject of a station update, for short (ETA) a ... train station? bus station? "Station update" just feels so weird, like it's about TV or something. I actually wanted APSE early but didn't put it in because the "E" felt wrong in the cross. POLISHUP was hard to parse (2D: Make final improvements to). SOBSTORY was very vaguely clued (3D: A play to one's emotions) (Something about the "A" at the front of the clue felt strange). And then the SW got me too, with SPOIL being really hard to get from 43A: Turn, and that clue on PARROT, ugh, and ONEACT, also toughish (I wanted some 6-letter word for "existential" ... or else the actual 6-letter word FRENCH). Having SALESMAN for SALES REP (ugh) really really killed me (36D: Professional pitcher). Had TAN for SUN, which was a very right wrong answer (23A: Go for the bronze?). I hate this clue for SUN. You might SUN yourself with zero intention of getting "Bronze," but TAN—straight line from TAN to bronze. Sigh. I've seen MEETCUTE a few times now so it didn't enchant the way it might have in, say, 2015. Really surprised TENET didn't get the Christopher Nolan movie title treatment (60A: Article of faith). My greatest moment of glory was spelling TA-NEHISI perfectly on the first try—I put his full name in a themeless for Buzzfeed, lo these many (five?) years ago. PYRAMID SCHEME is a nice answer. Seems like the kind of answer you'd build a theme around. You can have that idea for free, constructors of the world. See you tomorrow.
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