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raay04
Joined: 08 Dec 2012
Posts: 340
Location: India
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 Posted: Sat Nov 14, 2015 12:18 pm Post subject: Yet another teleconverter question |
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raay04 wrote:
Hello folks , this question is regarding kenko teleconverters. I have a kenko macro teleplus mc7 teleconverter and it has the same opical formula as the Vivitar 2x macro focusing tc . Both the vivitar and kenko has a helicoid , now on ebay .com i also see that there are kenko 2x teleplus mc7 TCs but without any helicoid . i see it also has a 7 element 5 group design like the macro teleplus , but can anyone confirm if they have same optical diagram ?? please see the below photos to better understand the equipment iam talking about
Macro teleplus with helicoid
optiacl diagram of macro teleplus/vivitar 2x macro focusing TC
kenko normal mc7 TC from manual era
_________________
Cameras-Point and shoot- Powershot A590IS Mirroless-SONY NEX-3
Lenses
M42 Mount
Super-Takumar 55/1.8, Super-Takumar 50/1.4 ,SMC Takumar 50/1.4 ,MC Helios 44M7-58/2,MC Helios 77M-4 50/1.8,Helios 44-2(valdai), Zenitar-M 50/1.7 Pentacon 50/1.8, MC Jupiter-37AM 135/3.5, Industar 50-2 50/3.5
Nikon F mount
Vivitar close focus 28/2.8(Komine) Keleinar 5N 100/2.8
LTM
Jupiter 8 50/2
KIEV
Jupiter8M ( element donor lens )
Minolta SR(MD)
MD 35/1.8, MD 35-70/3.5 macro, MD 50/1.4 ,Vivitar Auto macro 55/2.8,
Canon FD
FDn50/1.4
Minolta AF
Vivitar (cosina) 100/3.5 macro
Minolta AF 35-70/4
Enlarger
EL NIKKOR 50/2.8
Adaptall
Tamron 24/2.5 , Tamron sp 90/2.5 |
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marcusBMG
Joined: 07 Dec 2012
Posts: 1312
Location: Conwy N Wales
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| Posted: Sat Nov 14, 2015 12:55 pm Post subject: |
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marcusBMG wrote:
The "MC7" TC's are pretty ubiquitous mine is a tokina rmc. Optical structure externally, and internally as far as I can tell, looks identical to my KAF macro teleplus MC7 (= vivitar), however the KAF's barrel is a little higher by a few mm, and the rear group on the tok protrudes a little more.
In general terms they are certainly very similar, but not quite identical. i would guess that if the optical assemblies were laid side by side it would not be possible to tell them apart by eye.
_________________
pentax ME super (retired)
Pentax K3-ii; pentax K-S2; Samsung NX 20; Lumix G1 + adapters;
Adaptall collection (proliferating!) inc 200-500mm 31A, 300mm f2.8, 400mm f4.
Primes: takumar 55mm; smc 28mm, 50mm; kino/komine 28mm f2's, helios 58mm, Tamron Nestar 400mm, novoflex 400mm, Vivitar 135mm close focus, 105mm macro; Jupiter 11A; CZJ 135mm.
A classic zoom or two: VS1 (komine), Kiron Zoomlock... |
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raay04
Joined: 08 Dec 2012
Posts: 340
Location: India
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| Posted: Sat Nov 14, 2015 1:10 pm Post subject: |
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raay04 wrote:
| marcusBMG wrote: |
The "MC7" TC's are pretty ubiquitous mine is a tokina rmc. Optical structure externally, and internally as far as I can tell, looks identical to my KAF macro teleplus MC7 (= vivitar), however the KAF's barrel is a little higher by a few mm, and the rear group on the tok protrudes a little more.
In general terms they are certainly very similar, but not quite identical. i would guess that if the optical assemblies were laid side by side it would not be possible to tell them apart by eye. |
My main intention is to swap elements , would it be fesible??
_________________
Cameras-Point and shoot- Powershot A590IS Mirroless-SONY NEX-3
Lenses
M42 Mount
Super-Takumar 55/1.8, Super-Takumar 50/1.4 ,SMC Takumar 50/1.4 ,MC Helios 44M7-58/2,MC Helios 77M-4 50/1.8,Helios 44-2(valdai), Zenitar-M 50/1.7 Pentacon 50/1.8, MC Jupiter-37AM 135/3.5, Industar 50-2 50/3.5
Nikon F mount
Vivitar close focus 28/2.8(Komine) Keleinar 5N 100/2.8
LTM
Jupiter 8 50/2
KIEV
Jupiter8M ( element donor lens )
Minolta SR(MD)
MD 35/1.8, MD 35-70/3.5 macro, MD 50/1.4 ,Vivitar Auto macro 55/2.8,
Canon FD
FDn50/1.4
Minolta AF
Vivitar (cosina) 100/3.5 macro
Minolta AF 35-70/4
Enlarger
EL NIKKOR 50/2.8
Adaptall
Tamron 24/2.5 , Tamron sp 90/2.5 |
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raay04
Joined: 08 Dec 2012
Posts: 340
Location: India
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| Posted: Sat Nov 14, 2015 2:00 pm Post subject: |
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raay04 wrote:
this tamron AF MC7 TC image i found on the .bay... looks to be same optics inside
_________________
Cameras-Point and shoot- Powershot A590IS Mirroless-SONY NEX-3
Lenses
M42 Mount
Super-Takumar 55/1.8, Super-Takumar 50/1.4 ,SMC Takumar 50/1.4 ,MC Helios 44M7-58/2,MC Helios 77M-4 50/1.8,Helios 44-2(valdai), Zenitar-M 50/1.7 Pentacon 50/1.8, MC Jupiter-37AM 135/3.5, Industar 50-2 50/3.5
Nikon F mount
Vivitar close focus 28/2.8(Komine) Keleinar 5N 100/2.8
LTM
Jupiter 8 50/2
KIEV
Jupiter8M ( element donor lens )
Minolta SR(MD)
MD 35/1.8, MD 35-70/3.5 macro, MD 50/1.4 ,Vivitar Auto macro 55/2.8,
Canon FD
FDn50/1.4
Minolta AF
Vivitar (cosina) 100/3.5 macro
Minolta AF 35-70/4
Enlarger
EL NIKKOR 50/2.8
Adaptall
Tamron 24/2.5 , Tamron sp 90/2.5 |
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marcusBMG
Joined: 07 Dec 2012
Posts: 1312
Location: Conwy N Wales
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| Posted: Sat Nov 14, 2015 3:59 pm Post subject: |
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marcusBMG wrote:
Swap elements? A dubious project IMO. It may be however that the rear group and the main group come out as a block or unit. You could try swapping those around.
_________________
pentax ME super (retired)
Pentax K3-ii; pentax K-S2; Samsung NX 20; Lumix G1 + adapters;
Adaptall collection (proliferating!) inc 200-500mm 31A, 300mm f2.8, 400mm f4.
Primes: takumar 55mm; smc 28mm, 50mm; kino/komine 28mm f2's, helios 58mm, Tamron Nestar 400mm, novoflex 400mm, Vivitar 135mm close focus, 105mm macro; Jupiter 11A; CZJ 135mm.
A classic zoom or two: VS1 (komine), Kiron Zoomlock... |
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raay04
Joined: 08 Dec 2012
Posts: 340
Location: India
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| Posted: Sat Nov 14, 2015 4:11 pm Post subject: |
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raay04 wrote:
well when i got the kenko macro teleplus cleaned i observed that all the elements were separate , no cementing . it is only wishful thinking that other mc7 tcs also have similar construction.
_________________
Cameras-Point and shoot- Powershot A590IS Mirroless-SONY NEX-3
Lenses
M42 Mount
Super-Takumar 55/1.8, Super-Takumar 50/1.4 ,SMC Takumar 50/1.4 ,MC Helios 44M7-58/2,MC Helios 77M-4 50/1.8,Helios 44-2(valdai), Zenitar-M 50/1.7 Pentacon 50/1.8, MC Jupiter-37AM 135/3.5, Industar 50-2 50/3.5
Nikon F mount
Vivitar close focus 28/2.8(Komine) Keleinar 5N 100/2.8
LTM
Jupiter 8 50/2
KIEV
Jupiter8M ( element donor lens )
Minolta SR(MD)
MD 35/1.8, MD 35-70/3.5 macro, MD 50/1.4 ,Vivitar Auto macro 55/2.8,
Canon FD
FDn50/1.4
Minolta AF
Vivitar (cosina) 100/3.5 macro
Minolta AF 35-70/4
Enlarger
EL NIKKOR 50/2.8
Adaptall
Tamron 24/2.5 , Tamron sp 90/2.5 |
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DConvert
Joined: 12 Jun 2010
Posts: 921
Location: Essex UK
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| Posted: Sat Nov 14, 2015 9:53 pm Post subject: |
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DConvert wrote:
| raay04 wrote: |
| well when i got the kenko macro teleplus cleaned i observed that all the elements were separate , no cementing . it is only wishful thinking that other mc7 tcs also have similar construction. |
The basic construction might be similar but I doubt they have the same focal lengths & refractive indexes for each element. They may well also be different diameters meaning they don't physically fit.
Mind you it might prove an interesting experiment to try, as long as none of the components have been expensive. |
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raay04
Joined: 08 Dec 2012
Posts: 340
Location: India
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| Posted: Sun Nov 15, 2015 7:53 am Post subject: |
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raay04 wrote:
well , currently thinks about getting a goodcondition macro tc , no need for hassle.
_________________
Cameras-Point and shoot- Powershot A590IS Mirroless-SONY NEX-3
Lenses
M42 Mount
Super-Takumar 55/1.8, Super-Takumar 50/1.4 ,SMC Takumar 50/1.4 ,MC Helios 44M7-58/2,MC Helios 77M-4 50/1.8,Helios 44-2(valdai), Zenitar-M 50/1.7 Pentacon 50/1.8, MC Jupiter-37AM 135/3.5, Industar 50-2 50/3.5
Nikon F mount
Vivitar close focus 28/2.8(Komine) Keleinar 5N 100/2.8
LTM
Jupiter 8 50/2
KIEV
Jupiter8M ( element donor lens )
Minolta SR(MD)
MD 35/1.8, MD 35-70/3.5 macro, MD 50/1.4 ,Vivitar Auto macro 55/2.8,
Canon FD
FDn50/1.4
Minolta AF
Vivitar (cosina) 100/3.5 macro
Minolta AF 35-70/4
Enlarger
EL NIKKOR 50/2.8
Adaptall
Tamron 24/2.5 , Tamron sp 90/2.5 |
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