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Flor27
Joined: 13 Sep 2007
Posts: 1195
Location: Paris, France
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 Posted: Tue Dec 04, 2007 6:14 pm Post subject: EF extension tubes |
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Flor27 wrote:
Hi all,
I would like to know if someone has this kind of noname EF mount extension tube :
In order to make a custom mount for my Rank Taylor Hobson 50/0.95, I need to know :
- A: the dimension of the available internal diameter of the EF mount (body side)
-B: the dimension of the smallest available internal diameter (excluding the lens side EF mount tube)
Thanks !
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Orio
Joined: 24 Feb 2007
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Location: West Emilia
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| Posted: Tue Dec 04, 2007 6:32 pm Post subject: |
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Orio wrote:
I have this tubes, but I don't have a caliper, sorry 
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Flor27
Joined: 13 Sep 2007
Posts: 1195
Location: Paris, France
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| Posted: Tue Dec 04, 2007 6:37 pm Post subject: |
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Flor27 wrote:
| Orio wrote: |
| I have this tubes, but I don't have a caliper, sorry |
The A dimenssion with any rule you have will be just fine, thanks ! 
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poilu
Joined: 26 Aug 2007
Posts: 10471
Location: Greece
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| Posted: Tue Dec 04, 2007 6:38 pm Post subject: |
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poilu wrote:
A 47mm
B 57mm
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Flor27
Joined: 13 Sep 2007
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| Posted: Tue Dec 04, 2007 6:42 pm Post subject: |
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Flor27 wrote:
Merci beaucoup Poilu ! 
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Flor27
Joined: 13 Sep 2007
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Location: Paris, France
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| Posted: Tue Dec 04, 2007 9:17 pm Post subject: |
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Flor27 wrote:
Too bad, the 50/0.95 is 48mm and I don't have a lathe do to a proprer 0,5mm grind in this extension tube...
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Flor27
Joined: 13 Sep 2007
Posts: 1195
Location: Paris, France
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| Posted: Wed Dec 05, 2007 4:26 pm Post subject: |
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Flor27 wrote:
| Orio wrote: |
| I have this tubes, but I don't have a caliper, sorry |
Do you need one, digital ?
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poilu
Joined: 26 Aug 2007
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| Posted: Wed Dec 05, 2007 6:21 pm Post subject: |
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poilu wrote:
The internal diameter of tube is 57mm everywhere. The 47mm is only at eos mount. Except if the 0.95 need to go inside the mount nothing will stop the 48mm.
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Flor27
Joined: 13 Sep 2007
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Location: Paris, France
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| Posted: Wed Dec 05, 2007 6:35 pm Post subject: |
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Flor27 wrote:
| poilu wrote: |
| Except if the 0.95 need to go inside the mount nothing will stop the 48mm. |
The 0.95 has to go further in the camera than the mount itself to obtain the greatest focusing distance possible. Of course without optical hack I will never achieve infinity focus... I expect to have at best 1 to 1,5 meters...
This lens has 48mm in external diameter... I've bought this extension tube and I will see if I can grind it to fit the lens...
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Orio
Joined: 24 Feb 2007
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Location: West Emilia
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| Posted: Wed Dec 05, 2007 11:11 pm Post subject: |
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Orio wrote:
| Flor27 wrote: |
| Orio wrote: |
| I have this tubes, but I don't have a caliper, sorry |
Do you need one, digital ? |
Well, I can't say I need one... every now and then I maybe wish to measure a lens cap, but that's about it
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