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Old taylor hobson Ortal TV lenses
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PostPosted: Sun Jun 20, 2010 9:14 am    Post subject: Old taylor hobson Ortal TV lenses Reply with quote

Hi,
I have these three fine Taylor Hobson lenses which I would like to try and mount on a DSLR.

ORTAL 2 f2 T2.3
ORTAL 5 f2.8 T3.1
ORTAL 3 f2 T2.3

All three are fitted with the original TV flange.
I want to be able to find the correct adapter for either Nikon Or Canon.

I wonder what is the mounting thread size (without the TV flange).
Is it M42 or other?

Any help or clue will be much appreciated.
Thanks
David


PostPosted: Sun Jun 20, 2010 9:32 am    Post subject: Reply with quote

Welcome to the forums! Cool

By "TV flange", do you mean C-mount?


PostPosted: Sun Jun 20, 2010 9:44 am    Post subject: Hi, I cannot recognize the TV mount Reply with quote

Hi,
Thanks for the quick reply
I can post some pictures.
Can you guide me on how to post some pictures?
Thanks
David


PostPosted: Sun Jun 20, 2010 9:53 am    Post subject: Reply with quote

Sure. When you are typing your reply, look at the buttons above the text portion. There is a button labeled "Upload picture", and when you press that, it gives you a method to upload pictures directly to the forum. Once the picture is uploaded, there is another link that will paste the image into your post.


PostPosted: Sun Jun 20, 2010 9:54 am    Post subject: Reply with quote

Show the rear part and when taking pictures put a ruler in the pictures to be aqble to estimate the size.

Ortals are older lenses for Vidicon and Plumbicon Tubes and have rather low resolution (TV resolution is just about 210 - 300.000 pixels) so don't expect wonders. Also teh image circle was rather small for these tubes 20-25mm.


PostPosted: Sun Jun 20, 2010 12:26 pm    Post subject: Reply with quote

Hi,
Thanks for your help
I uploaded a few pictures.
The connecting flange tube diameter is 60mm.





PostPosted: Sun Jun 20, 2010 4:20 pm    Post subject: Reply with quote

A job for a very good machinist with some photographic understanding and a lathe I would say!


PostPosted: Fri Jun 25, 2010 2:11 pm    Post subject: Reply with quote

Where does the focus fall? Have you taken pics by holding the lens to the lensless camera?

The ugly lugs on the outside look the best option but how to connect them to the camera?


PostPosted: Fri Jun 25, 2010 4:15 pm    Post subject: Reply with quote

Hi,
No i havent taken pictures holding the lens to the lensless camera,i will try that.

klaus,thanks for your effort and help.
David


PostPosted: Fri Jun 25, 2010 7:39 pm    Post subject: Reply with quote

They are certainly nice looking lenses! Worth using if just for that fact alone! Cool


PostPosted: Sat Jun 26, 2010 6:11 am    Post subject: Image circle Reply with quote

To cover a FF 35mm sensor the image circle will have to be very large? I am not sure that these lenses will accomplish that. Many TV lenses leave significant vignetting on the 4/3 sensor which is one quarter the size in area.

You can point the lens out the window and see what image forms on a piece of white card where you have marked inches or metric to enable a sizing of the image?


PostPosted: Sat Jul 10, 2010 3:38 am    Post subject: Re: Old taylor hobson Ortal TV lenses Reply with quote

GONGU wrote:
Hi,
I have these three fine Taylor Hobson lenses which I would like to try and mount on a DSLR.

ORTAL 2 f2 T2.3
ORTAL 5 f2.8 T3.1
ORTAL 3 f2 T2.3

All three are fitted with the original TV flange.
I want to be able to find the correct adapter for either Nikon Or Canon.

I wonder what is the mounting thread size (without the TV flange).
Is it M42 or other?

Any help or clue will be much appreciated.
Thanks
David


Hi David , I have the similar RTH Ortal 3" / 5" and are now under M42 mounting modification in Guangzhou China .

Once the mounting are complete modification , will inform the "lense specialist" to post the pics for sharing .

As for Optar 2" , will double-check if it may cover FF ( currently I have another Cooke Speed Panchro 2in awaiting for M mounting modification - details TBC ) .

So far I have a list of lenses etc Schneider Xenon 100f2,0 +125f2,0 / Astro Berlin 75f1,8 / 75f2,3 / 125f2,3 + Astro Berlin 50f1,8 , Cooke SP 75f2,0 , Angenieux 75f1,8 S3 , Leitz Elcan 6"f2,8 ( M42 ) + 3"f2,8 + 1,25"f2,8 ( the other 2 may only for M mounting - details TBC ) , CZ Tevidon 100f2,8 , Kern Switar 50f1,8 , ERA 85f1,5 TV lens ( very alike to Helios 85f1,5 ) , Enna Ennalyt 85f1,5 , CZ Biotar 80f2,0 , Angenieux 35f0,95 , etc awaiting modification by the same "lense specialist" in GZ China .

This "lense specialist" not merely with vast knowledge in optical aspects but with presentable skills in photography - his equipment ranging from M43 / APS-C / FF / Leica M and others .

I may suggest him to set-up a workshop in GZ if the market demand is positive . This workshop will be specialised in lense mounting modification + general maintainance etc ( including the fabrication of special purpose focusing helicoid M42 / M43 / M + the latest Sony NEX 3 / 5 varies adapters ) .

Our aim is to REBUILT - RECONTSRUCT - RECOVER all the excellent lenses from the past by means of meticulous craftsmanship , but with reasonable service charge not to burst your pocket .

Will keep all update once my lenses are completes modification - tentatively few will be by Sept 2010 .


Last edited by eh_jason2008 on Mon Jul 12, 2010 2:54 am; edited 2 times in total


PostPosted: Sat Jul 10, 2010 9:46 am    Post subject: Reply with quote

Well that sounds more like a business publication and deserves its own thread? Wink Wink


PostPosted: Sun Jul 11, 2010 9:08 am    Post subject: Reply with quote

ORTAL 5 f2.8 T3.1
ORTAL 3 f2 T2.3
they can cover and ues on 35MM FF DSLR,performance are excellent . next time I will publish when I modify completed


PostPosted: Sun Jul 11, 2010 10:14 am    Post subject: Reply with quote

Looking forward to seeing it!


PostPosted: Fri Jul 16, 2010 9:59 am    Post subject: Reply with quote

Attached pic of my Optar 3 in / 5 in before modification ...

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