Main Menu
|
|
The Forums
|
|
Cool Links
|
|
Gallery Links
|
|
 |
R3 filter |
 |
03-19-2006
|
#1
|
|
There's my Proctor-Silex!
lmd91343 is offline
Join Date: Feb 2006
Location: Los Angeles
Posts: 360
|
R3 filter
I have a Leitz A36 filter marked R3 . It is deep red, nearly opaque. I want to use it for some B & W infrared landscapes and flowers.
What is the filter factor? Any hints on using it with Kodak HIE?
I tried it on my old Sony videocam. I have the model that was recalled for revealing too much behind synthetic clothes in IR/nite mode. With this filter, it does what they said! Don't worry, it was only a test - OF MY WIFE. It will never be aimed at women wearing synthetic cloth. I am surprised that these things are not being wielded by scores of high school and college age boys at the beach.
Thanks,
__________________
-Lance
Rangefinders used:
Canon IV Sb2; B&H 7; 7s x2; Fed 1.b; 2.f modified for Canon 0.95; Zorki 1.c
Canonet QL17 GIII; Kodak Retina II; Moskva 5; Zeiss SI folder; Medalist II
Rangefinders lenses used:
Canon/Seranar 50/0.95; 50/1.8; 50/1.9; 85/2.0; 100/3.5; 135/4
FSU F10; I10; I22; I26; I50; J3; J9; J12
|
|
|
|
 |
|
03-19-2006
|
#2
|
|
my autofocus is broken.
kvanderlaag is offline
Join Date: Oct 2005
Location: Calgary, AB, Canada
Posts: 335
|
That is just downright weird.
And creepy.
__________________
-Keegan
[ Leica M2, Leica CL ] [ Zorki 6, FED-5 ] [ Kodak Retina IIc ] [ Agfa Karat IV ] [ Fujica 35-SE ]
|
|
|
|
|
03-19-2006
|
#3
|
|
back to basics
laptoprob is offline
Join Date: Feb 2005
Location: the original Haarlem
Age: 43
Posts: 1,541
|
3x would be 3 stops. 8x longer exposure plus maybe a little more to compensate for specific film sensitivity. Try and be amazed, I guess.
edit: you can just measure through the filter and know for sure!
__________________
groeten, Rob.
old Sonnars, what else?
You live and learn. At any rate, you live. Douglas Adams
for sale: Pasoptik 28mm brightline finder, Canon 25, 90mm Leitz M-adapter, Alden bulk loader, 39mm filters (093 IR, colours), two Summitar yellow filters.
new: South African panorama's
Last edited by laptoprob : 03-19-2006 at 22:54.
|
|
|
|
|
03-20-2006
|
#4
|
|
There's my Proctor-Silex!
lmd91343 is offline
Join Date: Feb 2006
Location: Los Angeles
Posts: 360
|
Rob,
I measured with my Luna Pro. It is 3 1/3 stops. Good catch!
However, My Leitz 36A yellow filter's number designation (0,1,2,3) does not match their filter factor (1/3,2/3,1,1).
How does the designation system work? Is there a paper or web site somewhere?
Quote:
|
Originally Posted by laptoprob
3x would be 3 stops. 8x longer exposure plus maybe a little more to compensate for specific film sensitivity. Try and be amazed, I guess.
you can just measure through the filter and know for sure!
|
Thanks,
__________________
-Lance
Rangefinders used:
Canon IV Sb2; B&H 7; 7s x2; Fed 1.b; 2.f modified for Canon 0.95; Zorki 1.c
Canonet QL17 GIII; Kodak Retina II; Moskva 5; Zeiss SI folder; Medalist II
Rangefinders lenses used:
Canon/Seranar 50/0.95; 50/1.8; 50/1.9; 85/2.0; 100/3.5; 135/4
FSU F10; I10; I22; I26; I50; J3; J9; J12
|
|
|
|
|
03-20-2006
|
#5
|
|
back to basics
laptoprob is offline
Join Date: Feb 2005
Location: the original Haarlem
Age: 43
Posts: 1,541
|
Measurement is Knowledge.
All other figures are approx. The value changes with light conditions too. That is why I used my CLE for BW filtering work in the first place. But a screwmount Leica is soooo cute!
This reminds me to go measuring my filters as well. Maybe the rule of thumb of my medium yellow, orange and red as 1, 2 and 3 stops has to be evaluated.
I have a few lighter yellows as well, but a little overexposure isn't bad.
__________________
groeten, Rob.
old Sonnars, what else?
You live and learn. At any rate, you live. Douglas Adams
for sale: Pasoptik 28mm brightline finder, Canon 25, 90mm Leitz M-adapter, Alden bulk loader, 39mm filters (093 IR, colours), two Summitar yellow filters.
new: South African panorama's
|
|
|
|
|
03-20-2006
|
#6
|
|
Registered User
VictorM. is offline
Join Date: Oct 2004
Location: Toronto
Age: 62
Posts: 1,393
|
Leitz simply numbered their filters, with the lower numbers indicating lighter shades of the same colour. The dark red, #3, had a filter factor of 15, with infrared film, in the early fifties. Of course modern films, infrared or not, will have different filter factors because their colour sensitivity is different. Also, some filters fade with age, again changing the filter factor. The only way to be sure is to shoot a test.
|
|
|
|
|
03-20-2006
|
#7
|
|
Registered User
John Shriver is offline
Join Date: Jan 2005
Location: Arlington, MA, USA
Posts: 961
|
The dark red filter is listed as having a filter factor of 20 in the 1937 Leica III instruction booklet part III. Well, for Agfa R-Film, which looks like it must have been their infrared film. Only film they gave a factor for with that filter. Looks to have a cutoff wavelength of about 695 millimicrons.
|
|
|
|
|
03-20-2006
|
#8
|
|
Registered User
VictorM. is offline
Join Date: Oct 2004
Location: Toronto
Age: 62
Posts: 1,393
|
The site is so slow, I didn't think I posted that reply.
|
|
|
|
| Thread Tools |
|
|
| Display Modes |
 Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
All times are GMT -8. The time now is 01:16. |
|
|
