DSLR chip to flange distance

[pilkinn]

Does anyone know the distance between the chip and the front mounting flange on a DSLR? I have a flattener with an adapter that creates the ideal spacing for a DSLR but I want to use it with a QHY8 so need to match the spacing.

Thanks. Neil.

[Photosbykev]

The Canon distance is 44mm from sensor to front flange.

[Psychobilly]

Anything else you'll find here...

Camera Mounts Sorted by Register

[Photosbykev]

Anything else you'll find here...

Camera Mounts Sorted by Register

That's a very useful reference.

[Psychobilly]

it is indeed its the second time I have linked it today

[Merlin66]

Yes, I know Peter ;-)

It was a great help to me as well......

[pilkinn]

Thanks for the link. Very interesting. So when the blurb on the flattener says the included adapter provides the ideal spacing for a DSLR it depend on which DSLR it means. I'll have to do a bit more experimenting than I figured.

[Psychobilly]

Chances are it would be designed around 55mm spacing - if it had a t-thread on the back... The t- mount lenses were designed to be used on a whole range of SLR camera bodies so had a longish "register" this meant that it was easy to build T ring adaptors to mount the lenses. The thickness of the trings depending on the register of the specific camera manufacturers mount.

Peter...

[pilkinn]

The flattener I've got (the WO TMB for FLT) seems to need a much larger spacing. I've tried to look around for a diagram. I couldn't find it on the WO site - until just now - the link was staring me in the face all the time!.

From the looks of it, you might struggle with say a Canon DSLR as you'd need a very small spacer to achieve the optimum spacing - although it depends on how thick the T mount adapter is. Luckily my QHY8 already has a T thread and with a 20mm deep chip distance I think I just need to add 35mm of spacers (113.13 - 58.14 - 20.0 = 34.99) ?

I'm going to keep hold of that link with the list of registers as I do have a DSLR and so it may just come in handy. Thanks again.

It's all a bit tricky this spacing lark!

[ChrisKnipe]

Thanks for the list Psycobilly..it's made it on to my bookmark list

[pmlogg]

How critical is the spacing from flatteners? I have a Tak FS60C and now the flattener for it. As I already have other T to EOS adapters I didn't want to have to fork out for the dedicated Tak one so instead I've used spacers but I am out by around 1mm. So how much of a difference am I likely to observe?