November/December View Camera Mag

Tyndall Bruce

A
Tyndall Bruce

  • 0
  • 0
  • 29
TEXTURES

A
TEXTURES

  • 4
  • 0
  • 56
Small Craft Club

A
Small Craft Club

  • 2
  • 0
  • 52
RED FILTER

A
RED FILTER

  • 1
  • 0
  • 45
The Small Craft Club

A
The Small Craft Club

  • 3
  • 0
  • 52

Recent Classifieds

Forum statistics

Threads
198,903
Messages
2,782,800
Members
99,743
Latest member
HypnoRospo
Recent bookmarks
0

photobackpacker

Advertiser
Advertiser
Joined
Mar 21, 2005
Messages
430
Location
Minnesota
Format
4x5 Format
Steve -

I got the Nov/Dec issue. Great stuff. In addition to the continued great content, the interview with LF camera sellers were a breath of fresh air and a ray of hope. Thank you

There are only a few magazines I keep. This is one of them.
 

Lee L

Member
Joined
Nov 17, 2004
Messages
3,281
Format
Multi Format
It also has the review of the Zone VI VC-LED head, which is interesting to read. I've been waiting to see the construction and cost on this. I've thought about this since learning about blue/green split filtration, and might build my own at some point. The head is basically two 99 step attenuators for the LEDs, separately controlled, with settings of 50 being half power output, and it sounds like the 00 setting is full off. There's a central button that turns both channels full on for focusing, etc.

Lee
 

Aggie

Member
Joined
Jan 1, 2003
Messages
4,914
Location
So. Utah
Format
Multi Format
Lee L said:
It also has the review of the Zone VI VC-LED head, which is interesting to read. I've been waiting to see the construction and cost on this. I've thought about this since learning about blue/green split filtration, and might build my own at some point. The head is basically two 99 step attenuators for the LEDs, separately controlled, with settings of 50 being half power output, and it sounds like the 00 setting is full off. There's a central button that turns both channels full on for focusing, etc.

Lee

Can you translate that for one with blonde roots?
 

L Gebhardt

Member
Joined
Jun 27, 2003
Messages
2,363
Location
NH
Format
Large Format
The head has two light sources built in: one blue and the other green. Both use LEDs but that is immaterial.

You can set the brightness of each channel separately from full on to full off. By setting different ratios of blue and green you can get different contrasts out of VC paper.
 

Lee L

Member
Joined
Nov 17, 2004
Messages
3,281
Format
Multi Format
Can you translate that for one with blonde roots?
Sorry Aggie. BTW, I had blonde roots before I was 18, but they went more reddish at that point, and a high percentage are now gray. My wife is also blonde, but she's a Ph.D. who teaches classes that require calculus, differential equations, and matrix transformations to grasp the subject properly. So even if I saw your blonde roots, I wouldn't make any assumptions.

This is a 4x5 variable contrast head that uses blue and green LEDs as a light source. It's available from Calumet and has been mentioned here on APUG. The blue and green LED arrays are controlled by separate attenuators (potentiometers/rheostats) so that their output, and consequently their relative contributions to the enlargement exposure can be nearly continuously varied. This gives the same range of results on variable contrast papers as two separate exposures with blue and green filters, commonly used in a white light enlarger for split filter printing.

It's a very cool idea (literally and figuratively), and with the recent price drops in high output green and blue LEDs, was bound to happen. I've calculated that I could get blue and green high output LEDs and circuit boards to mount them in for something less than $150. That's with half inch spacing and an array of about 99 LEDs covering 4x5 inches. That, an inexpensive power supply, a handful of resistors, a couple of potentiometers, and some diffusion plastic would duplicate the Zone VI head's function in some basic form. Add a PIC (a programmable integrated circuit used as a control device) and a little programming and you could do something home brewed that's very cool.

Lee
 

Aggie

Member
Joined
Jan 1, 2003
Messages
4,914
Location
So. Utah
Format
Multi Format
Thank You both. Not that I can't grasp the concept, it was just in that particular venacular I was seeing it float over my head. Your explanations helped and are totally understandable at least to me.

I dye my hair red so I am a blonde in denial. Seriously I collect college degrees like others collect antiques. Maybe the next one will be English so I can get rid of this poor grammer/spelling trait I have. ( I get bored and take college classes, over 25 years I have augmented my orginal dual degree)
 

roteague

Member
Joined
Jul 15, 2004
Messages
6,641
Location
Kaneohe, Haw
Format
4x5 Format
blaughn said:
Steve -

I got the Nov/Dec issue. Great stuff. In addition to the continued great content, the interview with LF camera sellers were a breath of fresh air and a ray of hope. Thank you

There are only a few magazines I keep. This is one of them.

Just think .... three more months and I may get it as well. I just checked the bookstore yesterday, and the July/August issue is still on the shelves.
 

BradS

Member
Joined
Sep 28, 2004
Messages
8,120
Location
Soulsbyville, California
Format
35mm
Not here yet either :sad:. Will keep looking sounds like a "good one".
 

Lee L

Member
Joined
Nov 17, 2004
Messages
3,281
Format
Multi Format
grahamp said:
With LEDs as the light source, it would be cool by definition...
Yes, the literal part of "literally and figuratively". I've been looking at the RH Designs Stop Clock Pro, which has a two separate timing channels for split filter printing, and also thinking about making a home built green/blue LED head over the last 6 months or so. The review of the Zone VI head in View Camera and more recent thoughts about a Stop Clock Pro just merged into an idea for a home brew PIC controlled two channel attenuator/timer connected to the light source. Unfortunately, I don't have the time for a project like this now, but the LED head for my D5 should be simple from available parts that would fit into the adjustable condenser housing. See the 9 LED circuit board strips and high output blue and green LEDs at superbrightleds.com for inspiration.

Lee
 

Lee L

Member
Joined
Nov 17, 2004
Messages
3,281
Format
Multi Format
And after some digging:

http://huws.org.uk/

for a couple of PIC controlled blue/green enlarger heads for MF and 4x5 with circuit diagrams and PIC source code.

Are we far enough off topic yet? Sorry...

Lee
 

Bob F.

Member
Joined
Oct 4, 2004
Messages
3,977
Location
London
Format
Multi Format
Lee L said:
And after some digging:

http://huws.org.uk/

for a couple of PIC controlled blue/green enlarger heads for MF and 4x5 with circuit diagrams and PIC source code.

Are we far enough off topic yet? Sorry...

Lee
Or Dead Link Removed for those of us with an allergy to popups... ( I know: Firefox & Google toolbar etc blocks them, but I just resent their very existence, speading their evil upon the face of the Earth... :wink: )

Huw has shown up here from time to time - don't know if he still around: hasn't posted since March.

Cheers, Bob.
 

hortense

Member
Joined
Jun 17, 2004
Messages
611
Location
Riverside, C
Format
Large Format
blaughn said:
Nov/Dec issue. ...interview with LF camera sellers were a breath of fresh air and a ray of hope.
Yes, this was an interesting interview but poorly written or, should I say poorly asked questions. I found it quite "rambling" many with standard bullshit answers. The the additional articles by Bill Andres and Richard Newman that were interesting.; the editing has improved.
 

hortense

Member
Joined
Jun 17, 2004
Messages
611
Location
Riverside, C
Format
Large Format
Construction

Too complicated for me but, I would buy one if it would fit my 4x5 Bessler.
 

steve simmons

Member
Joined
Sep 25, 2002
Messages
367
Hortense

What questions would you like to have asked. We wil do a followup and can ask them if you make suggestions.

There were some editing mistakes in the issue and we are putting corrections in the Free Articles section of our web site

www.viewcamera.com

steve simmons
 
Photrio.com contains affiliate links to products. We may receive a commission for purchases made through these links.
To read our full affiliate disclosure statement please click Here.

PHOTRIO PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Ilford ADOX Freestyle Photographic Stearman Press Weldon Color Lab Blue Moon Camera & Machine
Top Bottom