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PostPosted: Wed Nov 26, 2014 3:22 pm    Post subject: Reply with quote
calvin83 wrote:
rudolfkremers wrote:
rudolfkremers wrote:



It seems this lens has an M55 screwthread... I assumed I would have to use something like :
this

But I am not sure how to get things to mount on the lens side... there seem to be no M55 helicoids around?

Any advice?

If it is in M55x0.75, you can use a 52mm helicoid with 52-55 step ring or 42mm helicoid with T2 M42 mount, 42-49 and 49-55 step ring etc..


Do you mean a lens FILTER step ring? I hadn't even considered that??
So, M55-M52 step down ring (Or step up? I never remember) -->M52-m42 helicoid-->m42 to EOS adapter?
Something like that?

Smile


PostPosted: Wed Nov 26, 2014 3:32 pm    Post subject: Reply with quote
rudolfkremers wrote:
calvin83 wrote:
rudolfkremers wrote:
rudolfkremers wrote:



It seems this lens has an M55 screwthread... I assumed I would have to use something like :
this

But I am not sure how to get things to mount on the lens side... there seem to be no M55 helicoids around?

Any advice?

If it is in M55x0.75, you can use a 52mm helicoid with 52-55 step ring or 42mm helicoid with T2 M42 mount, 42-49 and 49-55 step ring etc..


Do you mean a lens FILTER step ring? I hadn't even considered that??
So, M55-M52 step down ring (Or step up? I never remember) -->M52-m42 helicoid-->m42 to EOS adapter?
Something like that?

Smile

Yes. You need a 52-55 step up ring . As you need to mount a heavy lens, it is recommend buying a good one(made in Japan or US). You can check your lens against with a 55mm filter to confirm if it is M55x0.75.


PostPosted: Wed Nov 26, 2014 3:35 pm    Post subject: Reply with quote
I have a nice good Fotodiox one, and it fits nicely on the back of the lens!

Now I need to find the helicoid I guess.

Is this a reasonable price? Amazon link

Or do forum members have better addresses to buy these? :_)


PostPosted: Wed Nov 26, 2014 3:42 pm    Post subject: Reply with quote
rudolfkremers wrote:
I have a nice good Fotodiox one, and it fits nicely on the back of the lens!

Now I need to find the helicoid I guess.

Is this a reasonable price? Amazon link

Or do forum members have better addresses to buy these? :_)

I think the price is OK. If you need one in better quality, here is one i recommend Click here to see on Ebay. Also prepare a set of M42 tube for adapting the lens.


PostPosted: Wed Nov 26, 2014 3:47 pm    Post subject: Reply with quote
calvin83 wrote:
rudolfkremers wrote:
I have a nice good Fotodiox one, and it fits nicely on the back of the lens!

Now I need to find the helicoid I guess.

Is this a reasonable price? Amazon link

Or do forum members have better addresses to buy these? :_)

I think the price is OK. If you need one in better quality, here is one i recommend Click here to see on Ebay. Also prepare a set of M42 tube for adapting the lens.


You are a star.

By "prepare a set of M42 tube"... do you mean some kind of tube I can cut, to adjust the lens wrt register distance? Isn't that what the focusing helicoid will help me do?
(Don't laugh, this is all new to me!)


PostPosted: Wed Nov 26, 2014 3:57 pm    Post subject: Reply with quote
rudolfkremers wrote:
calvin83 wrote:
rudolfkremers wrote:
I have a nice good Fotodiox one, and it fits nicely on the back of the lens!

Now I need to find the helicoid I guess.

Is this a reasonable price? Amazon link

Or do forum members have better addresses to buy these? :_)

I think the price is OK. If you need one in better quality, here is one i recommend Click here to see on Ebay. Also prepare a set of M42 tube for adapting the lens.


You are a star.

By "prepare a set of M42 tube"... do you mean some kind of tube I can cut, to adjust the lens wrt register distance? Isn't that what the focusing helicoid will help me do?
(Don't laugh, this is all new to me!)

You need to check the length of the extension need to achieve infinity by placing the lens in front of a camera(it must be larger or equals to the length of the helicoid and adapter or infinity will be lost ). With a 22mm helicoid and 52-55 step up ring, it will take about 3cm extension. You will need to add some M42 extension tube to increase the extension such than you can focus closer with the helicoid.

Also read 'How to determine the length of a focusing helicoid'
http://photographyoftheinvisibleworld.blogspot.hk/2011/01/how-to-determine-length-of-focusing.html


PostPosted: Wed Nov 26, 2014 4:07 pm    Post subject: Reply with quote
calvin83 wrote:
rudolfkremers wrote:
calvin83 wrote:
rudolfkremers wrote:
I have a nice good Fotodiox one, and it fits nicely on the back of the lens!

Now I need to find the helicoid I guess.

Is this a reasonable price? Amazon link

Or do forum members have better addresses to buy these? :_)

I think the price is OK. If you need one in better quality, here is one i recommend Click here to see on Ebay. Also prepare a set of M42 tube for adapting the lens.


You are a star.

By "prepare a set of M42 tube"... do you mean some kind of tube I can cut, to adjust the lens wrt register distance? Isn't that what the focusing helicoid will help me do?
(Don't laugh, this is all new to me!)

You need to check the length of the extension need to achieve infinity by placing the lens in front of a camera(it must be larger or equals to the length of the helicoid and adapter or infinity will be lost ). With a 22mm helicoid and 52-55 step up ring, it will take about 3cm extension. You will need to add some M42 extension tube to increase the extension such than you can focus closer with the helicoid.

Also read 'How to determine the length of a focusing helicoid'
http://photographyoftheinvisibleworld.blogspot.hk/2011/01/how-to-determine-length-of-focusing.html


This is lik some kind of dark art. Very Happy
Right, M42 extension tube... like this? EBAY LINK

And where in the link is this placed? Between lend a helicoid, or between helicoid and body?
(Sorry about the question overload)


PostPosted: Wed Nov 26, 2014 4:19 pm    Post subject: Reply with quote
rudolfkremers wrote:
calvin83 wrote:
rudolfkremers wrote:
calvin83 wrote:
rudolfkremers wrote:
I have a nice good Fotodiox one, and it fits nicely on the back of the lens!

Now I need to find the helicoid I guess.

Is this a reasonable price? Amazon link

Or do forum members have better addresses to buy these? :_)

I think the price is OK. If you need one in better quality, here is one i recommend Click here to see on Ebay. Also prepare a set of M42 tube for adapting the lens.


You are a star.

By "prepare a set of M42 tube"... do you mean some kind of tube I can cut, to adjust the lens wrt register distance? Isn't that what the focusing helicoid will help me do?
(Don't laugh, this is all new to me!)

You need to check the length of the extension need to achieve infinity by placing the lens in front of a camera(it must be larger or equals to the length of the helicoid and adapter or infinity will be lost ). With a 22mm helicoid and 52-55 step up ring, it will take about 3cm extension. You will need to add some M42 extension tube to increase the extension such than you can focus closer with the helicoid.

Also read 'How to determine the length of a focusing helicoid'
http://photographyoftheinvisibleworld.blogspot.hk/2011/01/how-to-determine-length-of-focusing.html


This is lik some kind of dark art. Very Happy
Right, M42 extension tube... like this? EBAY LINK

And where in the link is this placed? Between lend a helicoid, or between helicoid and body?
(Sorry about the question overload)

M42 to EOS adapter -> extension tube(s) -> helicoid -> step up ring -> lens. Personally, I prefer the old Japanese extension tubes as the Chinese tubes are poorly made.


PostPosted: Wed Nov 26, 2014 4:31 pm    Post subject: Reply with quote
calvin83 wrote:
rudolfkremers wrote:
calvin83 wrote:
rudolfkremers wrote:
calvin83 wrote:
rudolfkremers wrote:
I have a nice good Fotodiox one, and it fits nicely on the back of the lens!

Now I need to find the helicoid I guess.

Is this a reasonable price? Amazon link

Or do forum members have better addresses to buy these? :_)

I think the price is OK. If you need one in better quality, here is one i recommend Click here to see on Ebay. Also prepare a set of M42 tube for adapting the lens.


You are a star.

By "prepare a set of M42 tube"... do you mean some kind of tube I can cut, to adjust the lens wrt register distance? Isn't that what the focusing helicoid will help me do?
(Don't laugh, this is all new to me!)

You need to check the length of the extension need to achieve infinity by placing the lens in front of a camera(it must be larger or equals to the length of the helicoid and adapter or infinity will be lost ). With a 22mm helicoid and 52-55 step up ring, it will take about 3cm extension. You will need to add some M42 extension tube to increase the extension such than you can focus closer with the helicoid.

Also read 'How to determine the length of a focusing helicoid'
http://photographyoftheinvisibleworld.blogspot.hk/2011/01/how-to-determine-length-of-focusing.html


This is lik some kind of dark art. Very Happy
Right, M42 extension tube... like this? EBAY LINK

And where in the link is this placed? Between lend a helicoid, or between helicoid and body?
(Sorry about the question overload)

M42 to EOS adapter -> extension tube(s) -> helicoid -> step up ring -> lens. Personally, I prefer the old Japanese extension tubes as the Chinese tubes are poorly made.


Brilliant. I now have a plan thanks to your kind and patient support!


PostPosted: Wed Nov 26, 2014 5:10 pm    Post subject: Reply with quote
rudolfkremers wrote:

Brilliant. I now have a plan thanks to your kind and patient support!

You are welcomed! You may not need to add tubes as the lens is pretty long itself.

Please report back in your thread at the DIY section when you are done. It might be useful to other members.


PostPosted: Wed Nov 26, 2014 7:58 pm    Post subject: Reply with quote
Instead of helicoid, consider a bellows.
These are usually cheaper than helicoids and may be more versatile.
They certainly are better for longer lenses as there is much more extension possible.


PostPosted: Thu Nov 27, 2014 2:03 am    Post subject: Reply with quote
If you don't use it on the field, a bellow might be a better opinion(as mentioned by Luis).

Here is one(different version) adapted to Nikon, you can see roughly how much extension you need.
http://www.dchome.net/forum.php?mod=viewthread&tid=1192083


PostPosted: Thu Nov 27, 2014 2:29 am    Post subject: Reply with quote
woodrim wrote:
That Kodak lens is quite valuable and its images very nice. Unfortunately, it is for large format, so any adaptation will require something quite long. You'll only be using a small portion of the image circle, but supposedly it is sharp in the middle.


I have soviet lens OF-233 that share the aero ektar formula. It deserve to be adapted! And it's not that hard to make something quite solid when you have the screw holes on the mount of the lens (like on yours).
Here is my adaptation (lens is on the right) : https://pp.vk.me/c618226/v618226486/d3c2/yDgqUdOpl88.jpg
And the lens without the adapter : https://pp.vk.me/c622125/v622125486/b97f/2CLw3sGMhtc.jpg

Some samples : http://pierretizien-photos.blogspot.fr/2014/03/concerto-et-cetera-sous-lil-de-lof-233.html


PostPosted: Thu Nov 27, 2014 9:58 am    Post subject: Reply with quote
luisalegria wrote:
Instead of helicoid, consider a bellows.
These are usually cheaper than helicoids and may be more versatile.
They certainly are better for longer lenses as there is much more extension possible.


A bellows is on my list, but I will use this mostly in the field. I'll try tubes/helicoid first, and also acquire bellows over time. I have a lot lenses to adapt so I am sure I can use both methods Very Happy


PostPosted: Thu Nov 27, 2014 9:59 am    Post subject: Reply with quote
calvin83 wrote:
If you don't use it on the field, a bellow might be a better opinion(as mentioned by Luis).

Here is one(different version) adapted to Nikon, you can see roughly how much extension you need.
http://www.dchome.net/forum.php?mod=viewthread&tid=1192083


I have to say I am very curious how well this will perform on aps-c.
I'll find out soon. Smile


PostPosted: Thu Nov 27, 2014 10:01 am    Post subject: Reply with quote
BurstMox wrote:
woodrim wrote:
That Kodak lens is quite valuable and its images very nice. Unfortunately, it is for large format, so any adaptation will require something quite long. You'll only be using a small portion of the image circle, but supposedly it is sharp in the middle.


I have soviet lens OF-233 that share the aero ektar formula. It deserve to be adapted! And it's not that hard to make something quite solid when you have the screw holes on the mount of the lens (like on yours).
Here is my adaptation (lens is on the right) : https://pp.vk.me/c618226/v618226486/d3c2/yDgqUdOpl88.jpg
And the lens without the adapter : https://pp.vk.me/c622125/v622125486/b97f/2CLw3sGMhtc.jpg

Some samples : http://pierretizien-photos.blogspot.fr/2014/03/concerto-et-cetera-sous-lil-de-lof-233.html


Amazing looking contraption. Have you blogged/posted on how to do this anywhere?
I saw your images before and was blown away by them.

I don't have a large format camera yet, so I am not too hurried with the Aero Ektar. I need to decide if I will mod it for digital, or go for the full Graflex route... I suspect I should just get a large format digital camera, but I don't have the funds right now...

R
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