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mo
Joined: 27 Aug 2009
Posts: 8979
Location: Australia
Expire: 2016-07-30
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 Posted: Tue Mar 16, 2010 2:21 am Post subject: How do you use a preset lens correctly? |
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mo wrote:
I am talking about the macro takumar F4/50mm with the 2 aperture rings on the front of the lens,which is the one that sets the aperture you want and the other that you can open it up fully to see what you are photographing?Am I on the right track or missed the use of these 2 aperture rings?
For arguments sake the 1st ring closet to the camera can be number 1.
Your help much appreciated.
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Moira, Moderator 
Fuji XE-1,Pentax K-01,Panasonic G1,Panasonic G5,Pentax MX
Ricoh Singlex TLS,KR-5,KR-5Super,XR-10
Lenses
Auto Rikenon's 55/1.4, 1.8, 2.8... 50/1.7 Takumar 2/58 Preset Takumar 2.8/105 Auto Takumar 2.2/55, 3.5/35 Super Takumar 1.8/55...Macro Takumar F4/50... CZJ Biotar ALU M42 2/58 CZJ Tessar ALU M42 2.8/50
CZJ DDR Flektogon Zebra M42 2.8/35 CZJ Pancolar M42 2/50 CZJ Pancolar Exakta 2/50
Auto Mamiya/Sekor 1.8/55 ...Auto Mamiya/Sekor 2/50 Auto Mamiya/Sekor 2.8/50 Auto Mamiya/Sekor 200/3.5 Tamron SP500/8 Tamron SP350/5.6 Tamron SP90/2.5
Primoplan 1.9/58 Primagon 4.5/35 Telemegor 5.5/150 Angenieux 3.5/28 Angenieux 3,5/135 Y 2
Canon FL 58/1.2,Canon FL85/1.8,Canon FL 100/3.5,Canon SSC 2.8/100 ,Konica AR 100/2.8, Nikkor P 105/2.5
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luisalegria
Joined: 07 Mar 2008
Posts: 6602
Location: San Francisco, USA
Expire: 2018-01-18
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| Posted: Tue Mar 16, 2010 2:43 am Post subject: |
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luisalegria wrote:
You have it precisely right.
Set your taking aperture with the one ring, which sets a "stop".
Then you can flip the other ring - which actually opens and closes the aperture, and ideally should move very easily - open to focus and closed just before taking your shot.
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I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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mo
Joined: 27 Aug 2009
Posts: 8979
Location: Australia
Expire: 2016-07-30
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| Posted: Tue Mar 16, 2010 3:17 am Post subject: |
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mo wrote:
Thank you
The 1st ring is the stiffer of the 2 and with the more pronounced clicks,The end one is certainly more easier to move....the only thing I forgot to do was move it back when shooting 
I am excited I actually was on the right track as I could not find a thing in Google and my books seemed to have missed that feature of a lens 
Do you know what the coloured dots are for?... Perhaps DOF?
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Moira, Moderator
Fuji XE-1,Pentax K-01,Panasonic G1,Panasonic G5,Pentax MX
Ricoh Singlex TLS,KR-5,KR-5Super,XR-10
Lenses
Auto Rikenon's 55/1.4, 1.8, 2.8... 50/1.7 Takumar 2/58 Preset Takumar 2.8/105 Auto Takumar 2.2/55, 3.5/35 Super Takumar 1.8/55...Macro Takumar F4/50... CZJ Biotar ALU M42 2/58 CZJ Tessar ALU M42 2.8/50
CZJ DDR Flektogon Zebra M42 2.8/35 CZJ Pancolar M42 2/50 CZJ Pancolar Exakta 2/50
Auto Mamiya/Sekor 1.8/55 ...Auto Mamiya/Sekor 2/50 Auto Mamiya/Sekor 2.8/50 Auto Mamiya/Sekor 200/3.5 Tamron SP500/8 Tamron SP350/5.6 Tamron SP90/2.5
Primoplan 1.9/58 Primagon 4.5/35 Telemegor 5.5/150 Angenieux 3.5/28 Angenieux 3,5/135 Y 2
Canon FL 58/1.2,Canon FL85/1.8,Canon FL 100/3.5,Canon SSC 2.8/100 ,Konica AR 100/2.8, Nikkor P 105/2.5
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PaulC
Joined: 23 Dec 2008
Posts: 2318
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| Posted: Tue Mar 16, 2010 8:37 am Post subject: |
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PaulC wrote:
| Mo-Fo wrote: |
Thank you
The 1st ring is the stiffer of the 2 and with the more pronounced clicks,The end one is certainly more easier to move....the only thing I forgot to do was move it back when shooting
I am excited I actually was on the right track as I could not find a thing in Google and my books seemed to have missed that feature of a lens
Do you know what the coloured dots are for?... Perhaps DOF? |
Those dots would certainly correspond with the loss of light you would get using a teleconverter. I don't know if that is why they are there, but with a 2x teleconverter when the lens was set on f4 with the white dot, the 2x dot would show you what the effective aperture is.
I've not seen this before.
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alex
Joined: 18 Apr 2009
Posts: 561
Location: UK
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| Posted: Tue Mar 16, 2010 9:02 am Post subject: |
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alex wrote:
| PaulC wrote: |
| [Those dots would certainly correspond with the loss of light you would get using a teleconverter. |
My first thought was that, as it's a macro lens that can go to 1:1, it was something to do with effective apertures at big extensions.
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Alex |
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PaulC
Joined: 23 Dec 2008
Posts: 2318
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| Posted: Tue Mar 16, 2010 9:05 am Post subject: |
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PaulC wrote:
Maybe it came with dedicated tubes or bellows that were marked for the specified magnifications to correspond with these dots.
It ought to be an outstanding lens if it intended for extreme macro work.
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Minolfan
Joined: 30 Dec 2008
Posts: 3439
Location: Netherlands
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| Posted: Tue Mar 16, 2010 9:55 am Post subject: |
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Minolfan wrote:
I am convinced that Alex is right. I have a 50mm Minolta macro Rokkor with a scale on the barrel for the magnification and an indication on the focusing ring with the corresponding decreasing of the indicated aperture setting in stops. For your Takumar the factor is the needed extension of the shuttertime with unchanged aperture setting. So focused till 1: 2 you have to set the exposure x2, with extra ring to 1:1 set the exposure x4. Factors you don't have to calculate with, when you are measuring light through the lens ofcourse. But they are important when measuring with a handheld meter of calculating the settings for use of a flashlight. |
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mo
Joined: 27 Aug 2009
Posts: 8979
Location: Australia
Expire: 2016-07-30
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| Posted: Tue Mar 16, 2010 11:04 am Post subject: |
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mo wrote:
Thanks for the insight.I have about 10 shots left before I get the first film developed....annoying part is there is always a hint of wind when shooting.I have tried some ambitious shots such as a caterpillar hanging from a thread off a tree...I don't hold out much hope as it was spinning at the time 
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Moira, Moderator
Fuji XE-1,Pentax K-01,Panasonic G1,Panasonic G5,Pentax MX
Ricoh Singlex TLS,KR-5,KR-5Super,XR-10
Lenses
Auto Rikenon's 55/1.4, 1.8, 2.8... 50/1.7 Takumar 2/58 Preset Takumar 2.8/105 Auto Takumar 2.2/55, 3.5/35 Super Takumar 1.8/55...Macro Takumar F4/50... CZJ Biotar ALU M42 2/58 CZJ Tessar ALU M42 2.8/50
CZJ DDR Flektogon Zebra M42 2.8/35 CZJ Pancolar M42 2/50 CZJ Pancolar Exakta 2/50
Auto Mamiya/Sekor 1.8/55 ...Auto Mamiya/Sekor 2/50 Auto Mamiya/Sekor 2.8/50 Auto Mamiya/Sekor 200/3.5 Tamron SP500/8 Tamron SP350/5.6 Tamron SP90/2.5
Primoplan 1.9/58 Primagon 4.5/35 Telemegor 5.5/150 Angenieux 3.5/28 Angenieux 3,5/135 Y 2
Canon FL 58/1.2,Canon FL85/1.8,Canon FL 100/3.5,Canon SSC 2.8/100 ,Konica AR 100/2.8, Nikkor P 105/2.5
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