Agitation when rotary processing

[Scotty230358]

Having had marginal success using my HP combiplan and tray processing of 5x4 film I am now going to try rotary processing in my Jobo processor. I am going to be lazy and ask about agitation. Is two direction agitation better than single direction agitation.

Many thanks in advance

Adrian

[davemiller]

My guess is that it must be as you are less lightly to experience bromide drag marks which can be caused through regular flow pattens. However, as a confirmed tray processor I cannot be sure.

[Jim Noel]

Although for many years bi-directional agitation was touted as the only way to get smooth negatives, many users report that single direction works well. I have mine reverse, but am considering single direction for the expert drums because they are a very heavy load on the motor.

[Ron Marshall]

A Jobo tech. told me that reversing direction every 2.5 turns was optimal for the Expert Drums.

[Lachlan 717]

Reversing for me (non-Expert drums; non-expert operator!!)

[Bruce Watson]

I am going to be lazy and ask about agitation. Is two direction agitation better than single direction agitation.

I'll be lazy myself and just say "yes".

[Scott Davis]

I've always run my Jobo in bi-directional mode with my Expert drums - honestly I never knew it was possible to run it in only one direction.

[Oren Grad]

http://www.largeformatphotography.info/forum/showthread.php?t=46745

http://www.largeformatphotography.info/forum/showthread.php?t=55788

[Rui Morais de Sousa]

I would say:

ALWAYS reverse direction! I have been using it for over twenty years (E-6, C-41, B&W) with sucess. I see no reason to change it. As I said on a former post, I remember reading in some Jobo literature, back in Germany many years ago, that it was a MUST if you wanted to have consistent results...
I have always followed that rule, with all kinds of drums, including various Expert drums for sheet film processing.
Cheers,
Rui
AL-MOST-LY PHOTOGRAPHY (http://ruimoraisdesousa.blogspot.com/)

[David Karp]

I use the 3010 and 3005 drums on a Beseler base. I do not reverse them. So far, no problems.

[Jim Graves]

I use the 3005 Expert for 4x5, Whole Plate, and 8x10 on a Beseler base ... reversed for the 1st year ... switched to no reverse for the last 1.5 years ... I notice absolutely no difference. If I was using the non-Expert drums, I'd reverse.

I shoot only B&W .. Fuji Acros 100 in 4x5, Ilford FP4 WP, and Arista 200 8x10 ... develop with Pyro HD and HC-110.

[Scotty230358]

Thank you all for your helpful advice.

[Greg Blank]

Yes and no. Using the Expert drum you won't need the processor to reverse direction.

You should however IMOP, tip the drum with the lift turning off the motor each time*Once per minute for five seconds.*



Having had marginal success using my HP combiplan and tray processing of 5x4 film I am now going to try rotary processing in my Jobo processor. I am going to be lazy and ask about agitation. Is two direction agitation better than single direction agitation.

Many thanks in advance

Adrian