Films/speeds with similar development times?

Is there any compiled list or something of films and at which speed they have a similar (+/-30s) time to another film/speed? For C-41 and E-6 of course it's all easy, but B/W is variable.

The combination I recently found is FP4+@200 and HP5+@1600 share almost the same speed for DD-X and HC-110. I used DD-X and leaned toward under development (the FP4+ required a bit longer) since some notes I found said the recipe produces high contrast for FP4+ (even with reduced development it was pretty high contrast).

I recall once developing Tri-X and HP5+ in the same tank as well at some point. I think Tri-X was box speed and HP5+ was pushed or vice versa.

Anyone else have any experience doing different films in the same process?

(and stand development is cheating )

If you are willing to work at a particular temperature, there are some developers that permit the same development time with both T-Max 100 and T-Max 400.
Kind of convenient, wouldn't you say?

I've exposed FP4 and ACROS at the same speed, then developed sheets of both in the same tray of PMK at the same time, for the same length of time, with completely predictable results. Sadly, ACROS is disappearing, with its sheet film likely to go out of circulation first. FP4 has a similar tonality and even similar look if you add a light yellow-green filter to it; but in smaller 120 roll film size, the slightly finer grain and higher acutance of ACROS was welcome.

DREW WILEY said:

Sadly, ACROS is disappearing, with its sheet film likely to go out of circulation first

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It seems that way. Went to a crazy cool rare film store in Shanghai and they had plenty of bricks of Acros in 120 and 35mm but said they hadn't seen any Acros in sheet format available in months

On your box of developer it should have a list of films and dev times, you could find the ones that have the same dev times on there.

I go for what is part "like" stand-dev, but also not! This means that I use the 'perfect' amount of dev for a roll or sheet, I use 3,5ml of hc-110 for each 120 roll or 135 (36) roll - that way I can mix all kinds of film in the same tank as long as they are shot at box speed! The difference for me in opposite to "stand" development is that I agitate more often, like just as often as I would like, normally 10sec every 5mins for a total of an hour. If I use a larger tank than 1liter I tend to extend the hour to two hours. Water temp around 23-24C.

I think the negatives come out just perfect whatever I put in it and dont really know any longer why I would use D76 or any other developer.
I started to use this method for very old film which I was unable to find times for and found the results very much impressive, and so I do this for all films since a year back or so.

I guess the downside is that the development takes more time - perhaps all is done and developed after 15mins, but I do one hour anyway just to make sure that all of the concentrate is used.

Somebody a couple days ago stated that he had just acquired sixty boxes of 4X5 Acros for personal use. That's quite an investment, but it does keep well in a cool environment. With so many really good sheet films currently available, I don't feel that urge, though I did wisely stockpile quite a bit of 8X10 TMax (both speeds) when it was at a far lower price than today, and keep that in the freezer. I am currently adding more 5-pk rolls of 120 Acros to the freezer, but have already mostly switched to TMX, since I put in some time learning how to enhance its edge effect for landscape use. Generally I prefer TMY400 or FP4 sheet film for that kind of application, but in the case of smaller 120 roll film, need the finer grain of TMX100, which also happens to have a longer straight line and hence faster realistic speed than either ACROS or FP4. I'm getting superb results,
but still want enough ACROS on hand for its own kind of look or its unique characteristics. I use a lot of different developers for special purposes, but my regular go-to developer for general photography is PMK pyro.

earlz said:

Is there any compiled list or something of films and at which speed they have a similar (+/-30s) time to another film/speed?

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Not that I've come across. That doesn't mean it doesn't exist, of course.

If you tend to work with certain films you could always reference the dev times on the Massive Dev Chart and look for film speeds (exposure indexes, really) that allow you to match the times up.
It means you'd have to do the legwork yourself, but if you usually use the same developer it shouldn't take too long to gather the information you need there and compile a list for yourself since the MDC is easily searchable.

I have looked into the possibility of developing different film types in the same tank as well, but things never seemed to line up quite right so I stopped trying. Either the times weren't close enough or the agitation scheme was different or I just hadn't recently shot the type of film that would have worked. After a while it just seemed easier to develop one type of film at a time.

Over the years I've regularly processed EFKE (Adox) 25, Tmax100, Agfa APX100 alongside each other in the same developing tanks, the APX100 @ 100EI and the EFKE 25 and Tmax 100 @ 50 EI, that was in Rodinal and Xtol, all print on the same grade of paper.

These days I'm processing Delta 100 & 400, HP5, EFKE 25 alongside each other in Pyrocar HD mostly at box speed (EFKE 25 had a daylightb speed of 50 ISO, Tungsten speed is 25 ISO hence the name). I've also process the odd rolls os Acros alongside these films.

The only exceptions are I never process Fomapan 100 & 200 alongside other films as I use significantly shorter development times with them to tame their contrast.

Ian