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Meopta Meostigmat 1.4/70 on FF and NEX via VNEX
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PostPosted: Sun Sep 21, 2014 2:46 pm    Post subject: Reply with quote
iangreenhalgh1 wrote:
Is that a helicoid or just a sliding tube?


As far as I understand it, it is a helicoid using metal on one side and velvet on the other. So it doesn't slide, but turn. A clever solution.
I will be able to enjoy this construction soon. I just need to decide which version I order from Henry. Wink


PostPosted: Sun Sep 21, 2014 5:25 pm    Post subject: Reply with quote
iangreenhalgh1 wrote:
Is that a helicoid or just a sliding tube?


This is helicoid like and has on one side a multiple 18 track thread, and as a counterpart a selfcutting velvet, which corresponds to the threads in the alloy body.
Rotating the lens, will move/turns the lens body forward and backwars, just like a normal helicoid, as Carsten described.

Works perfect, smooth from infinity to about 0.3m... and without any tolerances.

Regards
Henry


PostPosted: Sun Sep 21, 2014 5:43 pm    Post subject: Reply with quote
One piece of this helicoid is on the way to our User "buggz" ...
he plans to use it with a shorten Meostigmat on his Canon 5D MKII...

Hope he will report after his unit arrives.

Regards
Henry


PostPosted: Sun Sep 21, 2014 6:19 pm    Post subject: Reply with quote
Interesting idea, I wonder how long the life cycle of the velvet will be Wink


PostPosted: Sun Sep 21, 2014 8:47 pm    Post subject: Reply with quote
kds315* wrote:
Interesting idea, I wonder how long the life cycle of the velvet will be Wink


No problem after nearly 3 days of auto-rotating on a special constructed machine... and if it should be neccessary to replace the velvet in the future, its no problem to tape another stripe of the velvet on the Meopta Meostigmat 1.4/70mm... Very Happy

Simply screw in the new prepaired Meostigmat and enjoy...

Here you can see the velvet counterpart of the prototype... after 3 days of rotating the Meostigmat in the focusing aid...



For me and others, this works perfect... and if it should be necessary sometimes, no problem to replace the velvet after thousends and thousends turns.... replacement can be done by yourself for some cents...

This solution for the line of Meopta Meostigmat lenses is simply clever and easy to understand.

regards
Henry

Last edited by hinnerker on Sun Sep 21, 2014 9:00 pm; edited 1 time in total


PostPosted: Sun Sep 21, 2014 8:50 pm    Post subject: Reply with quote
I tried my 1.4/70 on my a850 today. Held against the mount, it only focuses about 20cm away and I see no way to shorten the tube by much, so it's for mirrorless only. Sad

So, anyone want to buy a Meostigmat 1.4/70 new, used only once briefly, in original case?


PostPosted: Sun Sep 21, 2014 9:16 pm    Post subject: Reply with quote
iangreenhalgh1 wrote:
I tried my 1.4/70 on my a850 today. Held against the mount, it only focuses about 20cm away and I see no way to shorten the tube by much, so it's for mirrorless only. Sad


Wrong statement... as you can see... if you would follow, what people posting here in this thread, you would have read that you can modify the lens to work on a Canon DSLR... and this one has a mirror-box. So its not only for mirrorless cams, only because you dont know how to modify the Meostigmat tubes.



If it fits to a Sony A850 or not depends on the hole diameter of the A-mount, because the rear lens has to intrude in the mirrorbox for some mm and this requires a minimum mount diameter of 47mm.

Sony A-Mount doesnt have this min. diameter as far as i know, so you can say... it works not on my Sony A850, but you cant say in generell, that this is only for mirrorless cams.

So you can simply say, that there are mounts, on which the Meostigmat will work and others on which it wont work.

But to say... its only for mirrorless is simply wrong

Last edited by hinnerker on Sun Sep 21, 2014 10:40 pm; edited 1 time in total


PostPosted: Sun Sep 21, 2014 9:34 pm    Post subject: Reply with quote
No need to be so critical.

Okay, so it will work on an EOS, but it will not work on a Sony DSLR or DSLT.


PostPosted: Mon Sep 22, 2014 1:21 am    Post subject: Reply with quote
Can barely wait!
I also will use the Meostigmat with the VNEX system on my FujiFilm X-E1.


hinnerker wrote:
One piece of this helicoid is on the way to our User "buggz" ...
he plans to use it with a shorten Meostigmat on his Canon 5D MKII...

Hope he will report after his unit arrives.

Regards
Henry


PostPosted: Mon Sep 22, 2014 6:26 am    Post subject: Reply with quote
iangreenhalgh1 wrote:
No need to be so critical.

Okay, so it will work on an EOS, but it will not work on a Sony DSLR or DSLT.


I have modifed my Meopta Meostigmat 70mm/1.4 for Canon EOS with a macro teleconverter helicoid. From what I remember there should be enough room for Sony DSLR too. Have to search for the lens at home.


PostPosted: Mon Sep 22, 2014 7:07 pm    Post subject: Reply with quote
The back lens border at my lens is at infinity about ~1mm bellow the EF flange. It does not protrude inside the camera on EF.
Sony A-mount free mount diameter is about 47mm, lens back housing diameter in my helicoid is 43mm, so there is enough room for the adapter part between this.
Yes, the Meopta Meostigmat 70mm f/1.4 can be converted to Sony A mount - but it is not a pure adaption. There is some machining to do.

Last edited by ZoneV on Mon Sep 22, 2014 7:18 pm; edited 1 time in total


PostPosted: Mon Sep 22, 2014 7:11 pm    Post subject: Reply with quote
How can it be adapted to A mount? The diameter of the lens tube is greater than the mount and the lens only focuses to about 20cm when held against the mount. There isn't much that can be done to shorten the tube.


PostPosted: Mon Sep 22, 2014 7:24 pm    Post subject: Reply with quote
The housing protrudes ~15mm behind the lens, and the actual lens diameter is much smaller than the housing.
My conversion was some months ago, don't remember the details. At the moment some hot glue is involved, probably I open it and make some photos of the parts.


PostPosted: Mon Sep 22, 2014 7:38 pm    Post subject: Reply with quote
The black part of the Meostigmat back has 6 mm. It can be "shaved" to 1 mm. to gain 5 mm. In fact you'll loose ~2 more mm. with the helicoid mount, so your only gain is ~3mm. by "shaving" it. That should be just enough for infinity focus on your camera, I think (if the "unshaven" lens focuses to infinity on EOS). If it doesn't, the adaptation is still possible but one has to re-make the barrel and back group lens thread (lathe) to be able to cut as much as ~1.5 cm. from the lens back.


PostPosted: Mon Sep 22, 2014 8:00 pm    Post subject: Reply with quote
Unshaved on EOS is focus only to ~50cm distance.
It is some work to get a lot of the back tube away (depends on what kind of helicoid to use). And I have worked on the inner lens tube too, to get the diameter as small as I needed. for Sony A mount this is needed too.


PostPosted: Mon Sep 22, 2014 8:01 pm    Post subject: Reply with quote
l shall have to take another look at mine, but I think there is only about 3mm that can be removed from the back of my copy, which would still be far rom infinity.

As dan says, to get the rear inside the mount would require lathe work as it's quite a bit wider than the opening in the mount.


PostPosted: Mon Sep 22, 2014 8:29 pm    Post subject: Reply with quote
Yes, as I wrote not easy adaption, but machining.
Either with lathe, or mill - or with a lot of patience, knowledge and hand tools.
I have used my lathe - but without thread cutting.


PostPosted: Mon Sep 22, 2014 9:11 pm    Post subject: Reply with quote
Hi Henry,
Maybe I'm confused, probably so.
I hope I will still be able to use the modified shortened Meostigmat with my Fuji XF mount VNEX system also.
Yes?

Ed

hinnerker wrote:
One piece of this helicoid is on the way to our User "buggz" ...
he plans to use it with a shorten Meostigmat on his Canon 5D MKII...

Hope he will report after his unit arrives.

Regards
Henry


PostPosted: Mon Sep 22, 2014 9:47 pm    Post subject: Reply with quote
buggz wrote:
Hi Henry,
Maybe I'm confused, probably so.
I hope I will still be able to use the modified shortened Meostigmat with my Fuji XF mount VNEX system also.
Yes?

Ed


Hi Ed,

yes, you can use the Meostigmat

1. on your Canon EOS 5D MKII
2. on your Fuji X cam via VNEX uni

After getting your parcel, you will find the Meostigmat 1.4/70mm mounted on the new velvet helicoid ready to work on EOS 5D MKII !
Mount this unit as is on your EOS and enjoy !

On the delivered VNEX uni with Fuji X mount you will find the unit already prepared with the neccessary tools to use the Meopta on your Fuji as well.

Therefore the Meostigmat 1.4/70mm do have on the rear of the body a special manufatured M39 thread. So if you want to use it on Fuji cam, simply screw out the Meostigmat from the Velvet Helicoid for the 5D MKII and screw it on the already prepared VNEX uni... if you like... all is possible !

This thread pitch inside the mount is M39 for connecting the lens to the VNEX uni to Fuji XF


You will understand the way how to connect the lens to each of your cams very fast... its really simple and easy to understand.

And if you dont want to change all the time between the new Velvethelicoid and the VNEX, simply you are free to use an EOS EF to Fuji X adapter...

This is possible because your Meostigmat 1.4/70mm is now optimized for use on EOS bodys with full infinity focus to close up distance at about 40cm !!


Another way would be, to change the 52mm reverse ring on the velvet helicoid to a 52mm > Fuji X reverse ring... you have all possibilities by hand.

For example .. if you have the VNEX uni prepard with an enlarger lens and would also like to take the premounted Meostigmat 1.4/70mm on the velvet helicoid with you.. simply take an EOS EF to Fuji Adapter... and enjoy the same way, as on the Canon 5D MKII without remounting the VNEX...

cheers,
Henry...

your parcel is on the way since yesterday...


PostPosted: Mon Sep 22, 2014 11:46 pm    Post subject: Reply with quote
GREAT!
This is so going to rock!
Thank you sir!
Can you tell I'm excited?
*8^)

hinnerker wrote:
buggz wrote:
Hi Henry,
Maybe I'm confused, probably so.
I hope I will still be able to use the modified shortened Meostigmat with my Fuji XF mount VNEX system also.
Yes?

Ed


Hi Ed,

yes, you can use the Meostigmat

1. on your Canon EOS 5D MKII
2. on your Fuji X cam via VNEX uni


PostPosted: Sat Sep 27, 2014 9:54 am    Post subject: Reply with quote
buggz wrote:
GREAT!
This is so going to rock!
Thank you sir!
Can you tell I'm excited?
*8^)

hinnerker wrote:
buggz wrote:
Hi Henry,
Maybe I'm confused, probably so.
I hope I will still be able to use the modified shortened Meostigmat with my Fuji XF mount VNEX system also.
Yes?

Ed


Hi Ed,

yes, you can use the Meostigmat

1. on your Canon EOS 5D MKII
2. on your Fuji X cam via VNEX uni or an EOS to Fuji X Adapter


Hi Ed,

and there is another good news for your Fuji - X cam...

you are now able to use your Canon modified Meostigmat 1.4/70mm with an aperture by simply use this adaptor...

here shown for my NEX 7 cam...


This is a link to the same thing with Fuji X mount...
http://www.ebay.de/itm/Canon-EOS-EF-Objektivadapter-Adapter-mit-Blende-an-Fujifilm-X-Mount-X-Pro1-X-E1-/290824320708?pt=DE_Foto_Camcorder_Objetivanschl%C3%BCsse_Adapter&hash=item43b67af6c4

Here are some quick samples with such an adaptor with integrated aperture for my Sony NEX 7 (or Alpha 7 in Crop-Mode)...

Close up @f1.4...



Close up @ f8-11...



Another comparison shot... (left 1. open, right 2. f8-11)



And a 100% crop of an infinity shot..



No need to tell, what was open and stopped down... Very Happy


Kindly regards
Henry


PostPosted: Sat Sep 27, 2014 11:29 am    Post subject: Reply with quote
Many thanks for posting the samples with aperture. I often wondered about these adapters with aperture, if they wouldn't cause vignetting as not placed at optical centre of lens. Apparently not, which is good to know. Smile


PostPosted: Sat Sep 27, 2014 12:37 pm    Post subject: Reply with quote
iangreenhalgh1 wrote:
Many thanks for posting the samples with aperture. I often wondered about these adapters with aperture, if they wouldn't cause vignetting as not placed at optical centre of lens. Apparently not, which is good to know. Smile


Vignetting is clearly visible on fullframe cams.. not on the APS-C formats like Fuji, NEX but for users with such cams, this is a very good thing to know.

But to use such an adaptor with an aperture, you must shorten the lens about some cm to get space to establish him between cam and lens-rest.


PostPosted: Sat Sep 27, 2014 4:39 pm    Post subject: Reply with quote
iangreenhalgh1 wrote:
Many thanks for posting the samples with aperture. I often wondered about these adapters with aperture, if they wouldn't cause vignetting as not placed at optical centre of lens. Apparently not, which is good to know. Smile

Most samples I've seen from adapters with apertures vignette more than increase DOF, even on APS-C, this actually looks usable for APS-C.


PostPosted: Sat Sep 27, 2014 5:02 pm    Post subject: Reply with quote
Lightshow wrote:
iangreenhalgh1 wrote:
Many thanks for posting the samples with aperture. I often wondered about these adapters with aperture, if they wouldn't cause vignetting as not placed at optical centre of lens. Apparently not, which is good to know. Smile

Most samples I've seen from adapters with apertures vignette more than increase DOF, even on APS-C, this actually looks usable for APS-C.


This is vignetting on the nearly closed aperture at infinity point on NEX 7... must be f22 or f32... adapter has no engraved values



That is a very small amount of vignetting... nobody would use this projection lens at infinity with such a high value... Very Happy

So IMHO this works perfect for the modified Meostigmat on APS-C...

Crop of center... the house in the background is about 1km away from my position during taking the shot.

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