| View previous topic :: View next topic |
| Author |
Message |
Jesito
Joined: 24 Aug 2007
Posts: 5745
Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
|
 Posted: Sat Jun 27, 2009 2:09 pm Post subject: Weston Master III - units and ISO equivalence (Help needed) |
 |
|
Jesito wrote:
I've been able of fixing a couple of nice Weston Master III light meters. Both show the same behaviour in front of a light source, but when trying to get them out to use, I found they aren't calibrated in ISO/ASA units but in Weston units.
Some places in the net say the equivalence is applying 1/3 stop lower (i.e. if you are using ISO 100 film, apply 80 on the Weston).
Other places say: "Film speeds have doubled since this meter was made, so it will overexpose if used at 4/5's of the recommended film speed ie 80 Weston = 100 ISO. You must divide by 5 and multiply by 8 to get the true figure, so 160 Weston = 100 ISO".
Anyone else having a Weston Master could shed me some light?.
Thanks in advance.
Jes.
_________________
Jesito, Moderator 
Jesito's backsack:
Zooms Sigma 70-300, Tamron 35-135 and 70-210 short, 70-210 long, 28-70 CF Macro, 35-70, 35-80, Vivitar 70-210 KA, Tamron 70-250.
Fixed Industar-50, , Tamron 24mm, Tamron 135mm, Sands Hunter 135mm, Pancolar 50mm, Volna-3, many Exakta lenses
DSLR SIGMA SD9 & SD14, EOS 5D, Sony A700 and NEXF3, Oly E-330, E-400, E-450, E-1
TLR/6x6/645 YashicaMat, Petri 6x45, Nettar, Franka Solida, Brilliant
SLR Minolta X300, Fuji STX II, Praktica VLC3, Pentax P30t, EXA500, EXA 1A, Spotmatic(2), Chinon CM-4S, Ricoh, Contax, Konica TC-X , Minolta 5000, 7000i, 3Sxi, EOS 500 and CX
Rangefinders Chinon 35EE, Konica C35 auto, Canonet 28, Yashica Lynx, FED-2, Yashica electro 35, Argus C3 & C4, Regula Cita III, Voigtlander Vitoret (many), Welta Welti-I, Kodak Signette 35, Zorki-4, Bessa-R & L, Minolta Weathermatic, olympus XA2
Compact Film Konica C35V, Voigtlander Vitorets, Canon Prima Super 105, Olympus XA2 and XA3
Compact Digital Olympus C-5050, Aiptek Slim 3000, Canon Powershot A540, Nikon 5200, SIGMA DP1s, Polaroid X530, IXUS55, Kodak 6490, Powershot G9 and G10
CSCCanon EOS-M, Samsung NX100 and NX210, Lumix G5, NEX-F3 |
|
| Back to top |
|
 |
Rense
Joined: 12 Sep 2008
Posts: 250
Location: Arnhem, The Netherlands
Expire: 2016-12-25
|
| Posted: Sat Jun 27, 2009 3:45 pm Post subject: |
|
|
Rense wrote:
Send a mail to John, he will know.
_________________
[5D][20D][50D][70D][EOS-M][Tamron Adaptall lenses][M42 lenses]
for complete gearlist, click here. |
|
| Back to top |
|
|
Shiladitya
Joined: 31 May 2008
Posts: 306
Location: New Delhi, India
|
| Posted: Sat Jun 27, 2009 5:15 pm Post subject: |
|
|
Shiladitya wrote:
| Quote: |
I've been able of fixing a couple of nice Weston Master III light meters. Both show the same behaviour in front of a light source, but when trying to get them out to use, I found they aren't calibrated in ISO/ASA units but in Weston units.
Some places in the net say the equivalence is applying 1/3 stop lower (i.e. if you are using ISO 100 film, apply 80 on the Weston).
Other places say: "Film speeds have doubled since this meter was made, so it will overexpose if used at 4/5's of the recommended film speed ie 80 Weston = 100 ISO. You must divide by 5 and multiply by 8 to get the true figure, so 160 Weston = 100 ISO".
Anyone else having a Weston Master could shed me some light?. |
I think you were refering to an old thread in Photo.net
I use both a Weston II which has the Weston scale and the Weston Master V which has the ASA scale. This 0.8 conversion works well for me and it gives consistent results as compared to the Master V.
Hope this helps.
_________________
Camera: 35mm SLR: Nikon F4s, Nikon FG, FE2, FM2n, FA; Pentax K1000, Spotmatic II, MZ60; Exakta Varex IIb, Olympus OM1n;
MF TLR: Yashica Mat 124G, Yashica 635, Rolleiflex Automat MX EVS
35mm RF: Voigtlander Prominent, Yashica Electro GSN, Minolta Hi-Matic 7s
MF Folder: Agfa Isolette III
Digital: Canon 5DC, Canon 550D
Lenses: Nikkor- 2.8/55 Micro, 1.4/50 AIS, 1.2/55 AI, 2.8/24 AIS, 2.8/20 AIS, 4/200 AIS, 2.5/105 AIS
Pentax K: SMC 1.7/50, 2.8/24, 3.5/135, 4/200 & 4.5/80-200
M42: SMC Tak 1.8/55, SMC Tak 3.5/28, SMC Tak 3.5/135, Super Tak 4/200, Yasinon DX 1.7/50, Meyer Oreston 1.8/50
Zuiko: 1.8/50, 3.5/28
Exakta: Pancolar 2/50, Pentacon 3.5/30, Enna 4.5/240
Prominent: Ultron 2/50, Skoparon 3.5/35, Dynaon 4.5/100 |
|
| Back to top |
|
|
visualopsins
Joined: 05 Mar 2009
Posts: 10992
Location: California
Expire: 2025-04-11
|
| Posted: Sat Jun 27, 2009 5:48 pm Post subject: |
|
|
visualopsins wrote:
I have Weston III. I use Weston 80 = ISO 100. Weston III meter readings agree with meter readings on several cameras...Weston III manual says use Weston 80 for ISO 100 film...
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
|
|
| Back to top |
|
|
Jesito
Joined: 24 Aug 2007
Posts: 5745
Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
|
| Posted: Sat Jun 27, 2009 7:33 pm Post subject: |
|
|
Jesito wrote:
Thanks a lot colleagues, I'll be using the 80 to 100 ratio!.
Regards,
Jes.
_________________
Jesito, Moderator
Jesito's backsack:
Zooms Sigma 70-300, Tamron 35-135 and 70-210 short, 70-210 long, 28-70 CF Macro, 35-70, 35-80, Vivitar 70-210 KA, Tamron 70-250.
Fixed Industar-50, , Tamron 24mm, Tamron 135mm, Sands Hunter 135mm, Pancolar 50mm, Volna-3, many Exakta lenses
DSLR SIGMA SD9 & SD14, EOS 5D, Sony A700 and NEXF3, Oly E-330, E-400, E-450, E-1
TLR/6x6/645 YashicaMat, Petri 6x45, Nettar, Franka Solida, Brilliant
SLR Minolta X300, Fuji STX II, Praktica VLC3, Pentax P30t, EXA500, EXA 1A, Spotmatic(2), Chinon CM-4S, Ricoh, Contax, Konica TC-X , Minolta 5000, 7000i, 3Sxi, EOS 500 and CX
Rangefinders Chinon 35EE, Konica C35 auto, Canonet 28, Yashica Lynx, FED-2, Yashica electro 35, Argus C3 & C4, Regula Cita III, Voigtlander Vitoret (many), Welta Welti-I, Kodak Signette 35, Zorki-4, Bessa-R & L, Minolta Weathermatic, olympus XA2
Compact Film Konica C35V, Voigtlander Vitorets, Canon Prima Super 105, Olympus XA2 and XA3
Compact Digital Olympus C-5050, Aiptek Slim 3000, Canon Powershot A540, Nikon 5200, SIGMA DP1s, Polaroid X530, IXUS55, Kodak 6490, Powershot G9 and G10
CSCCanon EOS-M, Samsung NX100 and NX210, Lumix G5, NEX-F3 |
|
| Back to top |
|
|
GrahamNR17
Joined: 17 Jan 2009
Posts: 1855
Location: Norfolk, UK
Expire: 2012-09-06
|
| Posted: Sat Jun 27, 2009 7:34 pm Post subject: |
|
|
GrahamNR17 wrote:
Yep, that's correct. 0.8 x ASA = Weston Units.
I wasn't around at the time of the change  |
|
| Back to top |
|
|
Jesito
Joined: 24 Aug 2007
Posts: 5745
Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
|
| Posted: Sun Jun 28, 2009 5:54 am Post subject: |
|
|
Jesito wrote:
| GrahamNR17 wrote: |
Yep, that's correct. 0.8 x ASA = Weston Units.
I wasn't around at the time of the change |
Thanks, Graham!.
I'm just learning how to use it. It seems quite complicate at the beginning with so many dials...
Regards,
Jes.
_________________
Jesito, Moderator
Jesito's backsack:
Zooms Sigma 70-300, Tamron 35-135 and 70-210 short, 70-210 long, 28-70 CF Macro, 35-70, 35-80, Vivitar 70-210 KA, Tamron 70-250.
Fixed Industar-50, , Tamron 24mm, Tamron 135mm, Sands Hunter 135mm, Pancolar 50mm, Volna-3, many Exakta lenses
DSLR SIGMA SD9 & SD14, EOS 5D, Sony A700 and NEXF3, Oly E-330, E-400, E-450, E-1
TLR/6x6/645 YashicaMat, Petri 6x45, Nettar, Franka Solida, Brilliant
SLR Minolta X300, Fuji STX II, Praktica VLC3, Pentax P30t, EXA500, EXA 1A, Spotmatic(2), Chinon CM-4S, Ricoh, Contax, Konica TC-X , Minolta 5000, 7000i, 3Sxi, EOS 500 and CX
Rangefinders Chinon 35EE, Konica C35 auto, Canonet 28, Yashica Lynx, FED-2, Yashica electro 35, Argus C3 & C4, Regula Cita III, Voigtlander Vitoret (many), Welta Welti-I, Kodak Signette 35, Zorki-4, Bessa-R & L, Minolta Weathermatic, olympus XA2
Compact Film Konica C35V, Voigtlander Vitorets, Canon Prima Super 105, Olympus XA2 and XA3
Compact Digital Olympus C-5050, Aiptek Slim 3000, Canon Powershot A540, Nikon 5200, SIGMA DP1s, Polaroid X530, IXUS55, Kodak 6490, Powershot G9 and G10
CSCCanon EOS-M, Samsung NX100 and NX210, Lumix G5, NEX-F3 |
|
| Back to top |
|
|
|
|
Search
Memberlist
Register
Profile
Log in to check your private messages
Log in
