Hi,
I would like to connect a Canon EF lens + 36mm 7position EFW + ASI2600MM.
Do you have an adapter that will achieve the correct back focus with the above combination? If so please recommend it and any spacers needed.
Thanks,
Ed

  • w7ay replied to this.

    Edmullinsphotography Canon EF lens + 36mm 7position EFW + ASI2600MM.

    That is going to be "very difficult." The flange focal distance of the 2600 and the EFW will be 12.5+20mm (not accounting for 1mm for the filter glass if the glass is 3mm thick). Call that 32mm.

    The EF lenses use a back focus of 44mm.

    That leaves 12mm (half an inch) for an adapter to adapt from a Canon flange to a 42mm thread. It is possible, but I have not come across one.

    For mono cameras, there are EOS/EF adapters that have built-in filter holders (just not wheels), but you would need to swap filters manually, and some (like the one from ZWO) are very cumbersome to filter swap, requiring the lens to be first removed before a new filter can be threaded in. I use a Starizona EF adapter with a 2" filter tray that you can swap filters without removing the lens -- but that may not work with the 36mm filters that you have.

    Chen

        a month later

        This product is the fraud of the year! I love astrophotography with lenses and I bought 2 of them and tested all my Canon EF lenses (and on my 4 zwo Asi183mc, asi294mc and mm and asi6200mm cameras). It will only work on lenses over 200mm. It didn't even focus with my 200mm fixed lens f /2.8 canon, using an asi294mc and an L-pro filter.

        Zwo's suggestion ("it's not a joke"): remove the T2 adapter. Great, then I'll have to buy another adapter for my camera (or use it in a filter wheel, to complicate things). Using the filter only, without a wheel, will never work, because removing the T2 it is not possible to put a filter inside it.

        I would like to know if they will refund their customers?

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