Help with calculations for developing negatives

10 months 4 weeks ago #658866 by LunaValRestrepo
Hi guys!

It's my second time posting in this forum and the first one was super helpful. 

I started developing my B&W negative in my bathroom but the results where not well revealed. After thinking about it, I concluded that one of my calculation was wrong. 

I wanted to check with you for the second time if my calculations are correct. 

My film is a FOMAPAN 400 ISO 400, my developer is a RODINAL, I have the ILFOSTOP and the KODAFIX solution. My tank is a Patterson tank universal 4 with two reels but I am only using one reel for one film. 

I decided to fill the tank entirely even though I am only developing one film. So 580 ml if I am correct. 

RODINAL : 1+25 / 11min / 20 degrees. 
580 / 26 = 22.3 ml 
580 - 22.3 = 557.7 ml 
So 22.3 ml of Rodinal and 557.7 ml of water
(I have seen the Dev Short and for ISO 400, three differetion dillutions were proposed, I chose the first one, please let me know if that is wrong). 

1+19 = 20
580 / 20 = 29 
580 - 29= 551
So 29 ml of ILFOSTOP and 551 ml of Water.

580/4 = 145
So 145 ml of Kodafix and 435 ml of Water

I hope this is not too much trouble for you, it would be a great help if someone is willing to check this calculations or let me know if the ml in my tank is wrong or anything else. 

Thank you so much for your time and wonderful help!!! 

Please Log in or Create an account to join the conversation.

10 months 4 weeks ago #658886 by Ozzie_Traveller
G'day mate

Your maths is fine - but don't fuss too much with being over-accurate with each of the stop or fixer ... each of them is reused several times, esp if you double or treble the strength. The developer on the other hand will need to be "fairly accurate" - not necessarily into scientific accuracy, but not so inaccurate as to make it all go belly-up

For me [years ago] I made up 2litre bottles of stop & fixer and reused them for up to a dozen rolls of film over about a 4-week period

For temperature control - esp in the cold of winter, I had the bottles in a warm-water bath in the sink - at about 70F / 21C before actual use in the tank. ps- my tanks were both the 2-roll & 4-roll sizes ~ I was also doing heaps of E6 colour slide stuff as well

Hope this helps
Phil from the great land Downunder

Please Log in or Create an account to join the conversation.





  • Facebook

    802,251 / Likes

  • Twitter

    205,000 / Followers

  • Google+

    1,620,816 / Followers

Latest Reviews

In this Fujifilm X-E3 review, learn about the specs, features, pros, cons, and more of this excellent entry-level mirrorless camera.

Aug 05, 2020

In this Nikon D500 vs Nikon D7500 matchup, we explore the features and specs, pros and cons, and prices of these older, but highly capable DSLRs.

Jun 22, 2020

Check out this Sony a7R IV review to learn all about this incredible camera's specs, features, image quality, price, and more.

Jun 15, 2020

The Panasonic Lumix S1 might be a few years old, but its features and specs (and its used price today) make it worth a long, hard look.

Jun 08, 2020
Get 600+ Pro photo lessons for $1

Latest Articles

What are the best metal print companies in 2020? In this detailed metal print comparison, we discuss the pros and cons of metal prints from six leading companies.

Aug 12, 2020

With these simple post-processing tips, you will learn how to edit a landscape photo for maximum impact.

Aug 11, 2020

Not sure how to seal the deal with your clients? With these photography business tips, learn a few insider tricks for capturing more long-term business.

Aug 11, 2020

Camera straps should be an investment in something that lasts a long, long time. These specialty Star Wars camera straps from Holdfast fit the bill!

Aug 11, 2020

Having a good lens filter in your kit is paramount if you want to take the best photos. This particular lens filter might just be the best one you can buy.

Aug 11, 2020

With this list of gifts for photographers under $250, you have tons of great holiday gift ideas for the photographer on your list!

Aug 06, 2020

If your photography business is floundering, use these six simple photography business tips to get the ball rolling.

Aug 06, 2020

photo album, photo album features, best photo album, photo album layout

Aug 05, 2020