Focal reducer for ED127

[allan gould]

Originally Posted by wasyoungonce

You see I wouldn't have looked at this as AP recommends ...."This optic is not recommended for telescopes with f/ratios below about f9."

edit:
also I noted the illumination circle, 30~34mm hows that go on a DSLR sensor illumination?

I would not of thought so either but the GSO RC is an f8 while the 127mm is f7.5 both with flattish fields. The CCDT67 is proven with the GSO RC and so I thought although not recommended I was going to buy it for the GSO and it was worth a go on the 127mm.
It should cover a DSLR sensor as the QHY10 is a 10mp sensor and quite a large chip (23.6x15.8mm). The chip has a diameter of ~28mm. There was some vignetting in the raw frames but flats took that out. I calculated that the full chip would be fully covered if I took another 10mm from the imaging train. But that will have to wait for another clear night.

[DJ N]

Originally Posted by scagman

Hi guys,

I am after a focal reducer for a North Group ED127 F7.5. Has anyone used one with this scope?. It will be used with a Meade DSI II on DSO's. Would I need a field flatener too.

Would I be better with a 2" or 1.25"?

Any thoughts on the this on http://www.myastroshop.com.au/guides...ar-reducer.htm or there's one at andrews on the Guan Sheng Acc. page.

Any thoughts/suggetions.

Thanks

Hi John,

I only just came across this thread. I recently purchased the "latest" William Optics flattener/reducer III, which is specifically designed for f7 to f7.5 scopes. I am "testing" it at the moment with my ED120, and so far the results are fairly promising......

http://www.iceinspace.com.au/forum/s...ad.php?t=86746

I have also the Hotech SCA Flattener, and this works superbly with the ED120 aswell. However, my main reason for trying the WO III is to try and "quicken" the iamging system from f7.5 to f6.

Hope this helps.

Cheers,

Daniel

[wasyoungonce (Brendan)]

Allan thanks for all the info, I'll certainly consider it although at this stage probably wait till the ES units are released, hopefully soon.

[scagman (John)]

Hi Daniel, Thanks for the link. Your shots look good. Another 1 to keep in mind for when I do purchase one. Alistairsm has just recieved a .5x reducer for his ED80, so I am going to try that in the next couple of weeks when he comes up to my place again to see how that goes. I would prefer the .5x as it would give me a bigger FOV. I was showing a friend my first shot of the HH and did a search here to show her what it looks like with more data and better processing and I came across your HH which looks great by the way, and it just shows how much I'm missing with the DSI. I suppose with the .5 this may cause me problems in the corners and may need a flattener. I'll post some images when I get some.

[jolasa]

Bought the new Explore Scientific reducer/field flattener.

See it here:
http://explorescientificusa.com/prod...iant=625974493

They say it is for f7 - f8 scopes.

It is 3", but they have an 2" nosepiece adapter available as well.

It works fine with my Explore Scientific 127mm APO. It will also work with the Explore Scientific 152mm APO.

I am testing it with other scopes, stay tuned.

JonS

[jolasa]

Duplicate post, removed.