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Thanks everyone. Appreciate the input. I decided to heat the solution to just below boiling. Precipitate disappeared. Now I will develop a few films to make sure I didn't alter anything with the high...

Has anyone had a white precipitate form in the Part A of their Photographer's Formulary Pyrocat-HD puchased as a liquid mixed in glycol and if so what did you do about it? I've seen threads about...

Hi, Let me know if this works for you as well. I am going to contact PF to see if they have any insight as to what exactly is happening in the solution when it gets cold.

Hedd-wyn

Problem solved. I filled up a mixing bowl with the hot water tap running into it and immersed my 500ml bottle of Part A. My hot water comes out of the tap at 128F or 53C. I left the bottle in to...

Well, that's good to know. Thanks for the prompt reply. This kit was from Photographers' Formulary as well. I notice that in other threads that Part B can precipitate out because of low storage...

I bought Pyrocat-HD in glycol, the large 500ml size to make 10 litres, in October of 2019. Upon receiving it, I immediately decanted both Part A and Part B into clean brown glass 500ml bottles and...

Thanks to both of you. Makes perfectly good sense.

Hi, This question is for the users of the ExpoDev software. I have recently tried Btzs with conventional film and developers and so far I am really enjoying the results. Now, I have done the testing...

UPDATE Oct.21/2019: To find Aristo replacement lamps you now have to go to www.light-sources.com . In the search box at the top of the page type in Aristo and you will be taken to the Aristo lamp...

Alright, now I understand why you suggested lux.seconds, More precision. Makes sense. Thanks for the links as well. You have motivated me to start dealing with logarithms.

Cheers.

Hi Pere, Thanks for the input. I am trying to follow a very specific methodology as outlined in the BTZS book. Non of the graphs that I am going to plot use lux.seconds. I am a neophyte film tester...

Just realized that the correct answer to question #4 is that I have to plot the 4 minute curve and measure the distance between IDmin and IDmax to get my SBR expressed in stops. Duh.

Hi, As a relative newbie to 4x5 photography I have decided to go down the rabbit hole of film testing. I have become intrigued with the testing method as outlined in the BTZS 4th ed. book by Phil...

Hi, I'm happy to report that replacement lamps are still being manufactured for the Aristo cold light heads including the VCL4500. Go to www.lcdl.com. Click on "Products" in the green menu bar at the...

Problem solved. There is nothing wrong with the timer. It has been my own stupidity all along, however, in my defense, nobody else caught on to the solution either.

Seems there is a User Option...

Hi all, After speaking to Keith Pitman it would appear that all my problems are stemming from the fact that my timer is, in fact, defective. It is not doing what it is supposed to. Looks like I will...

Hey Keith. No, but I do live in Canada and have free calling to the US. I'd really appreciate talking to you tonight.

My e-mail is: hedd-wyn@shaw.ca Please send me your # and I will call.

By...

Hey Keith, Thank-you for the response, according to what you are saying, I may actually be having a mechanical problem with my timer as suggested previously by Payral and photog-ed. When I am in test...

Hi, Thanks for the replies so far but unfortunately, gentlemen, the above replies aren't addressing the problem as I see it. I am not having any issue producing the actual test strip itself. The...

Hi, I have just starting to use a new RH Designs StopClock Vario f-Stop enlarging timer and I am seriously missing something when it comes to making a test strip as per the accompanying instructions....

Hi, Just an update for any other Toyo users considering an ultra wide lens. It took awhile but I am finally in possession of the Schneider 47mm f5.6 Super Angulon XL and I am just thrilled with the...

Thanks guys, The prompt response is appreciated. I went to the link you provided and you are right, you can drop the bed on this camera by tilting the whole camera forward and downward on the tripod...

Hi, I admire the ultrawide images I have seen in various portfolios and need specific advice on using such wide angle lenses on a Toyo 45A field camera. Specifically, as the Toyo doesn't have a drop...

Cor: Thanks for the advice. I had a feeling that this was a rather short developing time and figured I would start getting problems with even shorter times when I start to determine my N-1 time....

Hi, Thanks for the prompt responses. I guess I was too focused on producing a negative that would print on a Grade 2 paper contrast scale without filter manipulation hence the need to make changes to...

Hi, New to large format. I have standardized on two variable contrast papers. A resin coated, that being Ilford Multigrade IV RC DE LUXE Glossy and a fiber based, that being Oriental Seagull VC-FB II...

Hi, Thanks for the quick replies. Hadn't realized that non filtered VC paper had a grade 2 contrast. Makes sense for non filtered light sources though. Much appreciated. Glad to know my work wasn't...

Hi, Just getting into 4X5 processing. Determined personal film speed using Fred Picker's Zone VI testing method. (my speed: 250 for TMX 320 processed in a Unicolor print drum and motorized base for 7...

Hi,Thanks everyone. The green light evidently is way brighter than the blue in both standard and dual models. The green is also used maxed out for the split printing. The dimmer is to reduce short...

Hi, I am looking for advice from someone who is using the Aristo VCL4500 Dual Dimmer Model of this cold light head. I am about to use this light for the very first time. The blue lamp is controlled...