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Help needed re: attaching camera to flattener


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Hi all,




...to which I'd like to attach an i-Nova camera that has a c mount.


Can anyone advise on which exact adapter/s I need? 

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Hi Lee_P,

The M48 adaptor you currently have is for a DSLR camera so won't be suitable for you requirement.

What you need are these: -

http://www.teleskop-express.de/shop/product_info.php/info/p3504_TS-Adaptor-from-M48--2--filter-thread--to-T2---low-profile.html

http://www.teleskop-express.de/shop/product_info.php/info/p288_TS-Adaptor-from-T2-to-C-Mount-thread.html

You may also require a couple of T2 extension tubes of appropriate length to fit between them so as to bring your Backfocus to the required 55mm +/- 0.5mm between FF/FR and camera image plane... this distance is critical in order to retain a true flat field.

A selection of these can be found here: -

http://www.teleskop-express.de/shop/index.php/cat/c124_Extension-Rings.html

Hope this helps.

Good luck.

Sandy. :grin:

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Hi Lee_P,

Yes they will do the job with the exception of the spacer rings (3rd item you listed)... these are for very fine tuning and you may need some larger ones... like these: -

http://www.firstlightoptics.com/adaptors/t2-extension-tube-set.html

The thin rings you listed can be used in conjunction with these if only a small difference in length is required.

The extension size you need will depend on the back focus of your camera. ( front of camera body to image sensor)... subtract this value and the focal lengths of the 2 main adaptors from 55mm... the difference will be the value you require.

Good luck.

Sandy. :grin:

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Thanks again Sandy. I think that the camera has 19mm of back-focus, but there don't seem to be any adapters with that specific length. Is my best bet to buy a 15mm extension, and couple that with the smaller ones for fine tuning?

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Hi Lee_P,

Your calculation for required spacer is not correct at 15mm.

The M48 - T2 adaptor is 10mm optical path length.

The T2 - C-mount adaptor is 22mm optical path length.

Your camera backfocus is 19mm.

this adds up to 51mm.

SW FF/FR requires 55mm backfocus distance, therefore you actually need a 4mm T2 extension between the 2 adaptors.

The nearest to this that I am aware of is this 3mm one: -

http://www.teleskop-express.de/shop/product_info.php/info/p5731_TS-Optics---T2-Extension-Tube---Length-3mm.html

With the use of a couple of 0.5mm fibre fine tuning rings in 2 of the screwed joints this would be perfect,

I don't think the available thread lengths would allow for thicker rings.

Unfortunately FLO don't carry this 3mm adaptor.

The other place to try would be 'Modern Astronomy' they carry a good number of odd adaptors, including some of the Teleskop-express ones.

Hope this makes sense and you manage to get sorted.

Best regards.

Sandy. :grin:

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