backfocus Does Technosky 70/478 have enough backfocus to use it with 2" diagonals?

[w665gc]

https://www.astroshop.eu/telescopes/tecnosky-apochromatic-refractor-ap-70-478-quadruplet-flat-field-ota/p,57327

How to know this? I have read that with 65/420 scopes you cannot use 2" diagonals because there isn't enough backfocus.

[John]

I think that scope is the same or very similar to the TS Imaging Star 70mm quadruplet. The details for that scope say that a 1.25" diagonal will work for observation but the fact that they did not mention the ability to use a 2" diagonal makes me think that there is not enough focuser travel to use one:

  https://www.teleskop-express.de/shop/product_info.php/info/p6806_TS-Optics-Imaging-Star-70mm-f-6-78-QUADRUPLET-ED---Flatfield-Refractor---perfect-for-DSLR.html