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nemesis101
Joined: 25 Mar 2008
Posts: 2050
Location: Oregon USA
Expire: 2015-01-22
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 Posted: Fri Jun 04, 2010 5:52 am Post subject: Kenko variable tele / extension tubes (Nikon) Help? |
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nemesis101 wrote:
Hi
I have a set comprising a Nikon type Kenko variable 2x-3x extension tube / teleplus. The odd thing is that the lens in the tele part appears to be sprung loaded, and matches a hollow tube that runs down the centre of the extension tube. I suppose the extension is to give the extra magnification (from 2x to 3x) but what is the reason for the lens being sprung?
Any ideas folk?
Doug
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Scheimpflug
Joined: 06 Feb 2010
Posts: 1888
Location: New Zealand / USA
Expire: 2011-11-18
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| Posted: Fri Jun 04, 2010 7:04 am Post subject: |
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Scheimpflug wrote:
Wild guess: Is it to avoid damage from a collision with the rear element of the lens?
Do you have a photo of it?
_________________
Sigma DP1, Nikon D40 (hers  ), Polaroid x530, Pentax P30t, Pentax P50, (P30t/P50 K-A to Nikon F body mount conversion)
Nikon: 18-55/3.5-5.6 "G ED II DX" (F) Soligor: 28/2.8 (FL->F converted), 135/3.5 (F), 3x TC (F, modified) Kalimar: 28-85/3.5 (F)
Vivitar: 70-210/2.8-4.0 Version 3 (F), Tele 500/6.3 Preset (F), 19/3.8 (F) Minolta: 300/5.6 (SR/MC/MD pending F conversion)
Tamron: 28/2.8 (Adaptall) Panagor: 28/2.5 (FD) Aetna: 300/5.6 (F) Osawa: MC 28/2.8 (F)
Vintage Lenses: Dallmeyer: 1940s A.M. 14in 356mm f4 (ULF->M42) 1930s Adon Telephoto Taylor, Taylor & Hobson: 1880s Rapid Rectilinear 8 1/2 x 6 1/2 11.31in f/8 (LF->?)
Parts Lenses: Nikon 35-135/3.5-4.5 (F), Sigma 70-210/4.5 (F), Nikon 50/1.8 Series E (F) |
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nemesis101
Joined: 25 Mar 2008
Posts: 2050
Location: Oregon USA
Expire: 2015-01-22
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| Posted: Fri Jun 04, 2010 8:16 am Post subject: |
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nemesis101 wrote:
It seems to line up with the 'tube' on the extension adapter... and travels towards, not away from, the lens placed in front of it?
| Scheimpflug wrote: |
Wild guess: Is it to avoid damage from a collision with the rear element of the lens?
Do you have a photo of it? |
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Pros worry about money,
Masters worry about light. |
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PBFACTS
Joined: 24 Dec 2008
Posts: 569
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| Posted: Fri Jun 04, 2010 8:23 am Post subject: Re: Kenko variable tele / extension tubes (Nikon) Help? |
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PBFACTS wrote:
| nemesis101 wrote: |
Hi
I have a set comprising a Nikon type Kenko variable 2x-3x extension tube / teleplus. The odd thing is that the lens in the tele part appears to be sprung loaded, and matches a hollow tube that runs down the centre of the extension tube. I suppose the extension is to give the extra magnification (from 2x to 3x) but what is the reason for the lens being sprung?
Any ideas folk?
Doug |
Very old system (1970/1971) sold for few tm : Nikon, Exacta and very few others (no canon, no olympus, no minolta..) i have a ad.. i will check later the availables other mounts
It was the only system ever sold wich could 2x and 3x
The sprung is certainly (i presume) to put the converter lens at the right position depending on the magnification
_________________
OM USER .. I KEEP/USE:
Om2 sp + T32 (grip/filter/zoom) + T8
+ Zuiko 16mm 3.5 / 55mm 1.2 / 65-200 4/ x1.4
+ Sigma 8mm 4.0 / 14mm 3.5 / 18-35 3.5-4.5
+ Tamron 35/105 2.8
+Tokina 150/500 5.6
+ Kiron 105/2.8 macro 1:1
+ Vivitar S1 90/180 falst field macro
+ 2x Doubler HR7
>>I SELL: OM10 + OM4ti
+ i sell: OM Md1 + Md 2 + Grip PowerPack + charger
+ i sell: OM Zuiko 24mm 2.8 / 28mm 3.5 / 50mm 1.8 / 50mm 1.4 / 50mm 3.5 macro / 35-70 3.6 / 35-105 3.5-4.5 / 75-150 4 / 500mm / 2xA
+ i sell: OM Kiron 28/105 3.2-4.5 / 1.5 converter
+ i sell: OM Makinon reflex 5.6/300 + Spector reflex (makinon) 500mm
+ i sell: OM Macro panagor extender 1:1
+ i sell: OM Sigma 16mm 2.8 fisheye (last version) / 21-35 3.5-4.2 ot/ 28-70 2.8 /1000mm mirror
+ i sell: Tamron 28-70 3.5-4.5 / 28-80 sp 3.5-4.2 / 28-135 sp 4-4.5 / /28-200 3.5 / 35-135 3..5-4.5 / 90mm sp macro 1:1 2.8
+ i sell: OM Soligor 2x doubler / x3 converte
+ i sell: Soligor FisheEye x0.15
+ i sell: OM Tokina 28/135 4-4.6 / 70/210 3.5 (= vivitar S1 v2)
+ i sell: OM Vivitar 28-70 3.5-4.8 / 28-90 s1 2.8-3.5 / 35-70 2.8-3.8 / 55/2.8 Macro 1:1 (komine) / 70-150 3.8 ot (kiron) / 75-150 ot 3.8 (tokina + 2x matched)
+ i sell : OM cosina 100-500 5.6/8
Last edited by PBFACTS on Fri Jun 04, 2010 8:50 am; edited 1 time in total |
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nemesis101
Joined: 25 Mar 2008
Posts: 2050
Location: Oregon USA
Expire: 2015-01-22
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| Posted: Fri Jun 04, 2010 8:32 am Post subject: Re: Kenko variable tele / extension tubes (Nikon) Help? |
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nemesis101 wrote:
THANKS!
As the extension tube merely sits between the tele adapter and the camera I(and prsumably gives the extra magnification) I am not sure how a spring loaded lens would enhance matters though?
Doug
| PBFACTS wrote: |
| nemesis101 wrote: |
Hi
I have a set comprising a Nikon type Kenko variable 2x-3x extension tube / teleplus. The odd thing is that the lens in the tele part appears to be sprung loaded, and matches a hollow tube that runs down the centre of the extension tube. I suppose the extension is to give the extra magnification (from 2x to 3x) but what is the reason for the lens being sprung?
Any ideas folk?
Doug |
Very old system (1970/1971) sold for few tm : Nikon, Exacta and very few others (no canon, no olympus, no minolta..) i have a ad.. i will check later and the availables mounts
It was the only system ever sold wich could 2x and 3x
The sprung is certainly (i presume) to put the converter lens at the right position depending on the magnification |
_________________
Lenses and cameras:
Amateurs worry about equipment
Pros worry about money,
Masters worry about light. |
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PBFACTS
Joined: 24 Dec 2008
Posts: 569
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| Posted: Fri Jun 04, 2010 8:51 am Post subject: Re: Kenko variable tele / extension tubes (Nikon) Help? |
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PBFACTS wrote:
| nemesis101 wrote: |
As the extension tube merely sits between the tele adapter and the camera I(and prsumably gives the extra magnification) I am not sure how a spring loaded lens would enhance matters though?
|
The magnification is due to the distance beetween the rear element and the magnifier lens
Longer the distance, bigger the magnification
_________________
OM USER .. I KEEP/USE:
Om2 sp + T32 (grip/filter/zoom) + T8
+ Zuiko 16mm 3.5 / 55mm 1.2 / 65-200 4/ x1.4
+ Sigma 8mm 4.0 / 14mm 3.5 / 18-35 3.5-4.5
+ Tamron 35/105 2.8
+Tokina 150/500 5.6
+ Kiron 105/2.8 macro 1:1
+ Vivitar S1 90/180 falst field macro
+ 2x Doubler HR7
>>I SELL: OM10 + OM4ti
+ i sell: OM Md1 + Md 2 + Grip PowerPack + charger
+ i sell: OM Zuiko 24mm 2.8 / 28mm 3.5 / 50mm 1.8 / 50mm 1.4 / 50mm 3.5 macro / 35-70 3.6 / 35-105 3.5-4.5 / 75-150 4 / 500mm / 2xA
+ i sell: OM Kiron 28/105 3.2-4.5 / 1.5 converter
+ i sell: OM Makinon reflex 5.6/300 + Spector reflex (makinon) 500mm
+ i sell: OM Macro panagor extender 1:1
+ i sell: OM Sigma 16mm 2.8 fisheye (last version) / 21-35 3.5-4.2 ot/ 28-70 2.8 /1000mm mirror
+ i sell: Tamron 28-70 3.5-4.5 / 28-80 sp 3.5-4.2 / 28-135 sp 4-4.5 / /28-200 3.5 / 35-135 3..5-4.5 / 90mm sp macro 1:1 2.8
+ i sell: OM Soligor 2x doubler / x3 converte
+ i sell: Soligor FisheEye x0.15
+ i sell: OM Tokina 28/135 4-4.6 / 70/210 3.5 (= vivitar S1 v2)
+ i sell: OM Vivitar 28-70 3.5-4.8 / 28-90 s1 2.8-3.5 / 35-70 2.8-3.8 / 55/2.8 Macro 1:1 (komine) / 70-150 3.8 ot (kiron) / 75-150 ot 3.8 (tokina + 2x matched)
+ i sell : OM cosina 100-500 5.6/8 |
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nemesis101
Joined: 25 Mar 2008
Posts: 2050
Location: Oregon USA
Expire: 2015-01-22
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| Posted: Fri Jun 04, 2010 9:14 am Post subject: Re: Kenko variable tele / extension tubes (Nikon) Help? |
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nemesis101 wrote:
Thanks, but I knew that! I mentioned it actually - what I could not understand was how the spring loading could have anything to do with the 'variable' nature of the magnification as the tele-adapter provided x2 and the extension another x1... as I mentioned in the passage you quoted!?
Doug
| PBFACTS wrote: |
| nemesis101 wrote: |
As the extension tube merely sits between the tele adapter and the camera I(and prsumably gives the extra magnification) I am not sure how a spring loaded lens would enhance matters though?
|
The magnification is due to the distance beetween the rear element and the magnifier lens
Longer the distance, bigger the magnification |
_________________
Lenses and cameras:
Amateurs worry about equipment
Pros worry about money,
Masters worry about light. |
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PBFACTS
Joined: 24 Dec 2008
Posts: 569
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| Posted: Fri Jun 04, 2010 9:16 am Post subject: Re: Kenko variable tele / extension tubes (Nikon) Help? |
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PBFACTS wrote:
Perhaps to give precise distance ?
_________________
OM USER .. I KEEP/USE:
Om2 sp + T32 (grip/filter/zoom) + T8
+ Zuiko 16mm 3.5 / 55mm 1.2 / 65-200 4/ x1.4
+ Sigma 8mm 4.0 / 14mm 3.5 / 18-35 3.5-4.5
+ Tamron 35/105 2.8
+Tokina 150/500 5.6
+ Kiron 105/2.8 macro 1:1
+ Vivitar S1 90/180 falst field macro
+ 2x Doubler HR7
>>I SELL: OM10 + OM4ti
+ i sell: OM Md1 + Md 2 + Grip PowerPack + charger
+ i sell: OM Zuiko 24mm 2.8 / 28mm 3.5 / 50mm 1.8 / 50mm 1.4 / 50mm 3.5 macro / 35-70 3.6 / 35-105 3.5-4.5 / 75-150 4 / 500mm / 2xA
+ i sell: OM Kiron 28/105 3.2-4.5 / 1.5 converter
+ i sell: OM Makinon reflex 5.6/300 + Spector reflex (makinon) 500mm
+ i sell: OM Macro panagor extender 1:1
+ i sell: OM Sigma 16mm 2.8 fisheye (last version) / 21-35 3.5-4.2 ot/ 28-70 2.8 /1000mm mirror
+ i sell: Tamron 28-70 3.5-4.5 / 28-80 sp 3.5-4.2 / 28-135 sp 4-4.5 / /28-200 3.5 / 35-135 3..5-4.5 / 90mm sp macro 1:1 2.8
+ i sell: OM Soligor 2x doubler / x3 converte
+ i sell: Soligor FisheEye x0.15
+ i sell: OM Tokina 28/135 4-4.6 / 70/210 3.5 (= vivitar S1 v2)
+ i sell: OM Vivitar 28-70 3.5-4.8 / 28-90 s1 2.8-3.5 / 35-70 2.8-3.8 / 55/2.8 Macro 1:1 (komine) / 70-150 3.8 ot (kiron) / 75-150 ot 3.8 (tokina + 2x matched)
+ i sell : OM cosina 100-500 5.6/8 |
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PBFACTS
Joined: 24 Dec 2008
Posts: 569
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| Posted: Sat Jun 05, 2010 12:27 pm Post subject: Re: Kenko variable tele / extension tubes (Nikon) Help? |
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PBFACTS wrote:
| PBFACTS wrote: |
Very old system (1970/1971) sold for few tm : Nikon, Exacta and very few others (no canon, no olympus, no minolta..) i[i] have a ad.. i will check later the availables other mounts
|
After having checked the 11/1971 ad,
The mounts available were Nikon, Canon FX (before fd/no auto aperture), Topcon , Exacta (Topcon & exacta mounts are nearly same except auto aperture)+ M42.. NOTHING ELSE
_________________
OM USER .. I KEEP/USE:
Om2 sp + T32 (grip/filter/zoom) + T8
+ Zuiko 16mm 3.5 / 55mm 1.2 / 65-200 4/ x1.4
+ Sigma 8mm 4.0 / 14mm 3.5 / 18-35 3.5-4.5
+ Tamron 35/105 2.8
+Tokina 150/500 5.6
+ Kiron 105/2.8 macro 1:1
+ Vivitar S1 90/180 falst field macro
+ 2x Doubler HR7
>>I SELL: OM10 + OM4ti
+ i sell: OM Md1 + Md 2 + Grip PowerPack + charger
+ i sell: OM Zuiko 24mm 2.8 / 28mm 3.5 / 50mm 1.8 / 50mm 1.4 / 50mm 3.5 macro / 35-70 3.6 / 35-105 3.5-4.5 / 75-150 4 / 500mm / 2xA
+ i sell: OM Kiron 28/105 3.2-4.5 / 1.5 converter
+ i sell: OM Makinon reflex 5.6/300 + Spector reflex (makinon) 500mm
+ i sell: OM Macro panagor extender 1:1
+ i sell: OM Sigma 16mm 2.8 fisheye (last version) / 21-35 3.5-4.2 ot/ 28-70 2.8 /1000mm mirror
+ i sell: Tamron 28-70 3.5-4.5 / 28-80 sp 3.5-4.2 / 28-135 sp 4-4.5 / /28-200 3.5 / 35-135 3..5-4.5 / 90mm sp macro 1:1 2.8
+ i sell: OM Soligor 2x doubler / x3 converte
+ i sell: Soligor FisheEye x0.15
+ i sell: OM Tokina 28/135 4-4.6 / 70/210 3.5 (= vivitar S1 v2)
+ i sell: OM Vivitar 28-70 3.5-4.8 / 28-90 s1 2.8-3.5 / 35-70 2.8-3.8 / 55/2.8 Macro 1:1 (komine) / 70-150 3.8 ot (kiron) / 75-150 ot 3.8 (tokina + 2x matched)
+ i sell : OM cosina 100-500 5.6/8 |
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estudleon
Joined: 15 May 2008
Posts: 3754
Location: Argentina
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| Posted: Sat Jun 05, 2010 1:40 pm Post subject: |
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estudleon wrote:
I have a tele converter 2x-3x.
Brand? Vario Teleconverter 2x (CS) Japan. ¿¿??
Three points. 2X, 2,5X and 3x
2 tubes. the first to put when we need 2,5x
The second to put with the first when we need 3x.
IQ Good resolution at 2x. Only "emergency" to use 2,5. Not use 3x.
Loss of contrast near 1 stop at 2x.
Any reference of the brand?
Thanks.
Rino.
_________________
Konica 2,8/100
CZJ: 4/20, 2,4/35, 1,8/50 aus jena, 3,5/135MC, Pentacon 1,8/50
Pentax S-M-C-1,4/50
Helios 44-3
Mamiya 2,8/135
Misc. : jupiter 9
Stuff used:
A) SRL
Alpa 10 D - kern macro Switar 1,9/50 -black, Kilffit apochromat 2/100.
Asahi pentax spotmatic super takumar 1,4/50
Contaflex super B tessar 2,8/50 Pro-tessar 115
Leica R3 electronic summicron 2/50 elmarit 2,8/35
Konica Autoreflex 3 (2 black and chrome one), TC, T4. 2,8/24, 3,5/28 not MC and MC, 1,8/40, 1,4/50, 1,7/50 MC and not MC, 1,8/85, 3,2/135, 3,5/135, 4/200
Minolta XG9 2,8/35, 2/45, 3,5/135
Nikkormat FTn 1,4/50, 2,8/135
Fujica ST 801, 605, 705n. 3,5/19, 1,4/50, 1,8/55, 4/85, 3,5/135.
Praktica MTL 5 and a lot of M42 lenses.
Voigtlander. Bessamatic m, bessamatix de luxe, bessamatic cs, ultramatic and ultramatic cs.
Skoparex 3,5/35, skopagon 2/40, skopar 2,8/50, skopar X 2,8/50, super lanthar (out of catalogue) 2,8/50, dinarex 3,4/90, dinarex 4,8/100, super dinarex 4/135, super dinarex 4/200, zoomar 2,8/36-83, portrait lens 0, 1 and 2. Curtagon 4/28 and 2,8/35
Canon AV1, 1,8/50
Rolleiflex SL35 and SL35 E. 2,8/35 angulon, 2,8/35 distagon, 1,4/55 rolleinar, 1,8/50 planar, 4/135 tessar, 2,8/135 rolleinar, x2 rollei, M42 to rollei adap.
Etc.
RF
Yashica Minister III
Voightlander Vito, vitomatic I, Vito C, etc.
Leica M. M2, M3 (d.s.) and M4. Schenider 3,4/21, 2/35 summaron 2,8/35 (with eyes). Summicron 2/35 (8 elements with eyes), 2/35 chrome, 2/35 black, 1,4/35 pre asph and aspheric - old -, 2/40 summicron, 2,8/50 elmar, 2/50 7 elements, 2/50 DR, 2/50 - minolta version, 1,4/50 summilux 1966 version, 1,4/75 summilux, 2/90 large version, 2/90 reduced version of 1987, 2,8/90 elmarit large version, 4/135 elmar. |
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nemesis101
Joined: 25 Mar 2008
Posts: 2050
Location: Oregon USA
Expire: 2015-01-22
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| Posted: Sat Jun 05, 2010 6:53 pm Post subject: |
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nemesis101 wrote:
Not sure.
Mine has glass only in the single section, the other appears to be a simple tube. The only odd thing is as I said, the lens in the 2x section moves on a spring, and the extension tube section has an 'inner cylinder' that matches the diameter of the rear element of the 2x section, seemingly compressing it when in use? I wondered if this was to minimis internal reflections from inside the adapter or to prevent flare or
???
Doug
| estudleon wrote: |
I have a tele converter 2x-3x.
Brand? Vario Teleconverter 2x (CS) Japan. ¿¿??
Three points. 2X, 2,5X and 3x
2 tubes. the first to put when we need 2,5x
The second to put with the first when we need 3x.
IQ Good resolution at 2x. Only "emergency" to use 2,5. Not use 3x.
Loss of contrast near 1 stop at 2x.
Any reference of the brand?
Thanks.
Rino. |
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Lenses and cameras:
Amateurs worry about equipment
Pros worry about money,
Masters worry about light. |
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