Head to head
Agfa APX 100 vs Eastman Plus-X 5231
Two slow-ish, fine-grain black and white negatives that both promise that classic mid-century look, so they land on the same shortlist for anyone chasing smooth tones without grain getting in the way. The biggest split is not on the negative at all. APX 100 is a current, easy-to-buy still film. Plus-X 5231 is a discontinued Eastman motion picture stock, so you are buying remaining inventory, usually respooled by small sellers.
How they differ
On the rendering side they are cousins, not twins. APX 100 leans a touch crisper and more contrasty, with a clean, slightly modern bite to the sharpness that suits architecture, street, and anything where you want edges to snap. Plus-X gives you that gentler cine gradation, longer-feeling midtones and a softer roll into the highlights, which is exactly why people hunt it down for portraits and a vintage Hollywood feel. Rate APX at box speed (100) and Plus-X closer to 80 in daylight, and both reward a normal develop in something common like D-76 or HC-110.
Where they really part ways is buying and shooting them. APX 100 sits on shelves in 35mm and 120, costs little, comes in tidy factory cassettes, and you can reorder the same emulsion next year. The 5231 is 35mm cine film, so you are dealing with whatever a respooler loaded, variable quantities, no medium format, and prices that swing with how scarce the lot is. Quality control is on you and the seller, not a current production line. If you need ten consistent rolls for a project, that gap matters more than any tonal nuance.
Choose Agfa APX 100
Pick APX 100 when you want a dependable, cheap workhorse you can shoot a lot of and buy again. It is the better call for beginners learning to develop, for 120 shooters (Plus-X 5231 is 35mm only), and for anyone who likes a sharper, slightly punchier negative for street, landscape, or documentary work where consistency beats novelty.
Full Agfa APX 100 guide →Choose Eastman Plus-X 5231
Reach for Plus-X 5231 when the softer, cinematic tonality is the point and you do not mind the treasure-hunt of sourcing respooled cine stock. It suits portrait and mood-driven 35mm work, people who want that motion-picture lineage in a still frame, and shooters who already trust a particular respooler and are comfortable testing a roll before committing.
Full Eastman Plus-X 5231 guide →The verdict
Close enough that taste and logistics decide it. If you want repeatable, affordable, and available in two formats, APX 100 wins on practicality. If you specifically love the gentle cine gradation and accept hunting for discontinued stock, Plus-X 5231 is worth the chase. Most people should default to APX and treat 5231 as a deliberate, occasional indulgence.