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Lomo - OKC9-500-1 - rear flange / adapter


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#1 Steve Larsen

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Posted 23 November 2006 - 11:28 PM

Hi I recently purchased a Lomo - OKC9-500-1 for my Konvas 2M and upon close inspection it appears the rear mount is an adapter similiar those on the lomo 25-250 zoom lens. I wonder if anybody has experience with this lens and know if you can switch out the rear of the lens for the 1.5x & 2.1x extender's that come with the 35OPF-18 (25-250 lomo). here's a photo of the extenders I'm talking about: http://65.98.8.117/~...50/118_1847.jpg (from an ebay ad) and here's the photo showing the mount on my OKC9-500-1 : http://www.konvas.in...120003.JPG.html there are more photos of the adapter and lens in the same photo album.

Thanks in advance,

Steve.
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#2 Olex Kalynychenko

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Posted 24 November 2006 - 03:57 AM

Hi I recently purchased a Lomo - OKC9-500-1 for my Konvas 2M and upon close inspection it appears the rear mount is an adapter similiar those on the lomo 25-250 zoom lens. I wonder if anybody has experience with this lens and know if you can switch out the rear of the lens for the 1.5x & 2.1x extender's that come with the 35OPF-18 (25-250 lomo). here's a photo of the extenders I'm talking about: http://65.98.8.117/~...50/118_1847.jpg (from an ebay ad) and here's the photo showing the mount on my OKC9-500-1 : http://www.konvas.in...120003.JPG.html there are more photos of the adapter and lens in the same photo album.

Thanks in advance,

Steve.


What 25-250 mm lens you mean ? OPF-7. 25-250 mm, OPF-15 25-250 have no rear mount for connect lens mount. This is lenses have lens mount on rear part of body of lens.
I think, you mean OPF-18 20-120 mm zoom lens.
The user manual of set of lenses show, The lenses OKS5-250-1, OKS-9-500-1, OKS-5-750-1, OKS-4-1000-
1 have similar design of optical block and design of body of lens.
250 mm and 500 mm lenses have front optical adapter ( additional lens ) for shoot from short distance.
The lens OKS-5-750-1 consist of OKS-9-500-1 lens and rear optical dapter 1.25-x.
The lens OKS-4-1000-1 consist of OKS-9-500-1 lens and rear optical adapter 2-x.
The rear optical adapter have one design, but, have two different distance between rear glass of 500 mm optical block and front glass of adapter.

If you need, i can send diagrams from user manual.

I have no experience connect OKS-9-500 lens and rear adapters of OPF-18 zoom lens, but, i think, theoretically, this is possible, will need adjust of position of rear adapter on optical bentch only.

I had experience use a photo lens Carl Zeiss 180 mm, 300 mm, 600 mm from medium format photo camera Pentacon Six with 2x optical adapter, adapter P-6-Konvas-2M and Konvas-2M camera.
All work fine. The one problem, you have small speed of all this optical system.
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#3 Steve Larsen

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Posted 24 November 2006 - 12:47 PM

'Olex Kalynychenko'
What 25-250 mm lens you mean ? OPF-7. 25-250 mm, OPF-15 25-250 have no rear mount for connect lens mount. This is lenses have lens mount on rear part of body of lens.
I think, you mean OPF-18 20-120 mm zoom lens.

-> Hi Olex, I was talking about the OPF-18 and the adapters that go with it. There's a photo here in this ebay add of the lens and the adapters (including a PL adapter) ( http://cgi.ebay.ca/w...t...p;rd=1&rd=1 ) A member from a different board also pointed out that the OPF7 also has a similiar rear mount and adapters.

The user manual of set of lenses show, The lenses OKS5-250-1, OKS-9-500-1, OKS-5-750-1, OKS-4-1000-
1 have similar design of optical block and design of body of lens.
250 mm and 500 mm lenses have front optical adapter ( additional lens ) for shoot from short distance.
The lens OKS-5-750-1 consist of OKS-9-500-1 lens and rear optical dapter 1.25-x.
The lens OKS-4-1000-1 consist of OKS-9-500-1 lens and rear optical adapter 2-x.
The rear optical adapter have one design, but, have two different distance between rear glass of 500 mm optical block and front glass of adapter.

-> Is it the same adapters (1.5x & 2.1x) from the OPF18 that are used on the OKC9-500 ?

If you need, i can send diagrams from user manual.

-> A manual would be very nice.. You can send it to me or post it on www.konvas.info. Thanks in advance..

I have no experience connect OKS-9-500 lens and rear adapters of OPF-18 zoom lens, but, i think, theoretically, this is possible, will need adjust of position of rear adapter on optical bentch only.

-> It looks to me like the adapter will lock into position and can not be adjusted. The lens has a locking mechanism similiar to the OCT19 mount inside the lens. Would it not make sense if the first adapter locks into place (at the right spot) on the lens that the other adapters (1.5x & 2.1x) would also be at the same distance as the first adapter ?

I had experience use a photo lens Carl Zeiss 180 mm, 300 mm, 600 mm from medium format photo camera Pentacon Six with 2x optical adapter, adapter P-6-Konvas-2M and Konvas-2M camera.
All work fine. The one problem, you have small speed of all this optical system.

Thanks in advance,

Steve Larsen.

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#4 Steve Larsen

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Posted 16 December 2006 - 04:33 PM

What 25-250 mm lens you mean ? OPF-7. 25-250 mm, OPF-15 25-250 have no rear mount for connect lens mount. This is lenses have lens mount on rear part of body of lens.
I think, you mean OPF-18 20-120 mm zoom lens.
The user manual of set of lenses show, The lenses OKS5-250-1, OKS-9-500-1, OKS-5-750-1, OKS-4-1000-
1 have similar design of optical block and design of body of lens.
250 mm and 500 mm lenses have front optical adapter ( additional lens ) for shoot from short distance.
The lens OKS-5-750-1 consist of OKS-9-500-1 lens and rear optical dapter 1.25-x.
The lens OKS-4-1000-1 consist of OKS-9-500-1 lens and rear optical adapter 2-x.
The rear optical adapter have one design, but, have two different distance between rear glass of 500 mm optical block and front glass of adapter.

If you need, i can send diagrams from user manual.

I have no experience connect OKS-9-500 lens and rear adapters of OPF-18 zoom lens, but, i think, theoretically, this is possible, will need adjust of position of rear adapter on optical bentch only.

I had experience use a photo lens Carl Zeiss 180 mm, 300 mm, 600 mm from medium format photo camera Pentacon Six with 2x optical adapter, adapter P-6-Konvas-2M and Konvas-2M camera.
All work fine. The one problem, you have small speed of all this optical system.


Many thanks to Olex for the manuals for the lens and advice... I recieved my first adapter yesterday and put it on the lens today and tried it out. I now have a beautifull 750mm lens. I am sure the 2.1 adapter will also work with this lens now aswell after trying the 1.5x adapter. If you see one of these 500mm lens's for sale you might want to grab it..

here are the photos: http://www.konvas.in...Lens/?g2_page=4

Steve.

Edited by Steve Larsen, 16 December 2006 - 04:35 PM.

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