Field Flattener for ED80?

[danielsun]

Originally Posted by adman

sorry I hadn't registered how many Daniels there were...

My question related to Danielsun's one. What is the purpose of the special adapter? From the ad it looks like it has a T-thread on one end for the camera and the other end had a thread for screwing to the draw tube. Does it not work like this?

Adam

Yes, one end of the corrector screws directly onto the draw tube but the otherside has a different thread which does not scew onto a standard T-Ring, so you must but a new T-ring specially suited to fit the corrector.

[adman (Adam)]

Originally Posted by danielsun

Yes, one end of the corrector screws directly onto the draw tube but the otherside has a different thread which does not scew onto a standard T-Ring, so you must but a new T-ring specially suited to fit the corrector.

Thanks Daniel,

What the hell were they thinking (apart from making some extra $$ selling special adapter...)??

I might just get the (cheaper) WO FFII - does that require any additional hardware?

Adam

[danielsun]

I think Orion did it on purpose just so you have to buy their own T-ring.
I am not familiar with the WO at all so I don't know. Maybe someone else can answer that one.

Cheers Daniel.

[mill (Martin)]

The WO pflat is a T2 connection and screws straight into the t-ring of the camera.

[talltraveler (Richard)]

Originally Posted by adman

sorry I hadn't registered how many Daniels there were...

My question related to Danielsun's one. What is the purpose of the special adapter? From the ad it looks like it has a T-thread on one end for the camera and the other end had a thread for screwing to the draw tube. Does it not work like this?

Adam

A standard T2 camera adapter has a 42mm diameter aperture; from the Orion site I see that the flattener has a wider aperture (48mm), presumably to reduce or avoid vignetting with a full frame 35mm sensor (24x36mm, 42mm diagonal). Does anyone know how the Orion flattener for the ED120 performs with other telescopes?

Cheers

Richard

[acropolite (Phil)]

The special adapter is a larger diameter to prevent vignetting on FF SLR's

FWIW the orion adapter only screws on to the end of the original Synta focusser, it won't fit the GSO 10:1 replacement (not sure about the WO aftermarket focusser).

I'm trying to find a workaround as I've bought the Orion FR only to find that it won't fit my aftermarket focusser. It may just be a matter of finding an appropriate adapter, that is if the larger thread is a standard size.

Unfortunately I sold my original Synta focusser some tima ago, it would come in very handy at the moment.

[[1ponders] (Paul)]

I'll see what I can bring to Astrofest Phil. I'm sure to have something somewhere. In fact I know I have an old synta focuser lying around somewhere. I'll pinch the 2"- T thread adapter out of it

[Rockah (Zal)]

Yeah Phil I was about to buy the sw FR as it seemed to get quite good reviews, and even though I've got the stock focuser on there at the moment, I was told it was only compatible with the synta focuser and specifically not the GSO crayford (as this was next on my list). So I think the WO is a good option as it will go well with other focusers too

[acropolite (Phil)]

In fact I know I have an old synta focuser lying around somewhere. I'll pinch the 2"- T thread adapter out of it

It's not an adapter, but the drawtube that the FR screws on to.

I can see the reasoning behind it, to keep the aperture of the drawtube/FR as large as possible but it's damn restrictive.

I've done some research and an adapter to get back to a standard 2 inch adapter doesn't exist.

[adman (Adam)]

I ended up getting the Orion one - and the special adapter . Works very well - had it out last night.

Only one problem is that there is nowhere to fit my 48mm IDAS LPS filter - has anyone else come across this before? I suppose I could get one of the Astronomik clip-in filters?

Adam