Hotech Field Flattener

[pmrid]

I've just bought a Hotech Field Flattener for my ED127 refractor. I am wondering whether there is any specified or optimal distance/separation that should be maintained between the flattener and the imaging chip. I recall, for example, that the Baadr MPCC required a very precise 55 mm separation but I haven't been able, so far, to discover if a similar thing applies to these Hotech devices.
Anyone know?

Peter.

[h0ughy]

Peter,

All I did was put the t-ring adapter on it, put the camera on and shove it up the focuser , tighten the rings and then focus and shoot – brilliant you will love it see my recent shots in the deep space imaging section

Love it so much I have just bought a second one today – for the 80Ed scope I have. One is never enough, LOL, especially when operating two mounts

[pmrid]

Thanks David,
I haven't fired a shot through mine yet (weather has closed in on me) but I'm hoping my setup will be OK.
I've got it set up IN FRONT of my Orion Deluxe OAG with a QHY5 as a guide cam and a QHY8 hanging off the back. I've seen some other threads in the Equipment section suggesting that other brands (the Astrotech 0.75 reducer/flattener) have a rigid separation requirement too - like the MPCC's 55mm. But the Hotech flattener does not have any reducing function as far as I can discover. Perhaps that's the difference. Well, there's only one way to find out and that means waiting, waiting, waiting ... darn!

Peter.