Re: [M]: Re: Meade Focal reducer f3,3 RESPONSE
| Subject: | Re: [M]: Re: Meade Focal reducer f3,3 RESPONSE |
| From: | Alf Jacob Nilsen |
| Date: | Fri Apr 02 05:44:13 1999 |
Steve,
Thanks for your info. I am pleased with the AO-7 and I believe that often
removing and adding this unit will adventually damage the ST-7/AO-7 set up. I
have a feeling that delicate electronics like these units are should be left
alone as much as possible. Luckily I have a f6,3 scope and I had no problem
getting focus with MGF2-Versa slider port-filter slot-ST-7/AO-7 at f6,3. I have
not yet got my CFW-8, but I intend to mount this as a seperate unit (if
possible) and not intergrating it with the AO-7/ST-7 assembly. Ill try to
night to use the 3,3 focal reducer directly on the scope and then AO-7/ST-7 and
see how that works.... cross your fingers!
take care
Alf J
Steve Stefanik wrote:
> Alf,
>
> I asked the same question several weeks ago. You CANNOT attain focus with
> either a 3.3 or 6.3 focal reducer with the AO-7, MGF 2 focuser (or CFW-8)
> behind the focal reducer. Something has TO GO! As you said yourself, there
> is no advantage to using the AO-7 at f/2. Someone did say they were
> successful in attaining focus by placing the focal reducer after the focuser
> before the AO-7 with a specially machined adapter but without the CFW-8. You
> CAN reach focus using a focal reducer with the CFW-8 and ST-7 directly
> coupled together WITHOUT the MGF 2 focuser. I realize what a pain in the a**
> it is to remove the AO-7 and CFW-8 particularly if you have them directly
> interfaced with tiny screws from inside the CFW-8 housing like I do. With
> hindsight Im second guessing myself as to whether the AO-7 is worth all the
> bother considering what little gain one gets in resolution under only
> optimal seeing conditions. I originally bought the AO-7 to "correct"
> periodic drive error on long exposures (of several minutes) but I find
> myself using shorter exposures with TRACK & ACCUMULATE more often now and
> less long exposures with SELF-GUIDE. Id offer to sell you my AO-7 but you
> already have one!
>
> Steve Stefanik
>
> Alf Nilsen wrote:
>
> >Friends,
> >i have just got the Meade f3,3 focal reducer and tried to achieve focus
> >on my LX200 10 f6,3 (reduced to f2) yesterday. I also have the van
> >Slyke MGF2 focuser mounted to the rare port of the scope. I use the
> >ST-7/AO-7 set-up and if possible I want to avoid to remove the AO-7
> >(although I know that it has little effect when operating with f2).
> >
> >So I have:.... LX200 - focuser MGF2 - Focal Reducer f3,3 - AO7 -
> >ST7......, but I had a hard time finding the focus and I did not
> >succeed. Later on I also want to add the CFW-8, but can focus be
> >obtained at all with such set ups ?? Anyone of you using more or less
> >the same set-up ?
> >
> >take care
> >Alf J
> >
> >
Thanks for your info. I am pleased with the AO-7 and I believe that often
removing and adding this unit will adventually damage the ST-7/AO-7 set up. I
have a feeling that delicate electronics like these units are should be left
alone as much as possible. Luckily I have a f6,3 scope and I had no problem
getting focus with MGF2-Versa slider port-filter slot-ST-7/AO-7 at f6,3. I have
not yet got my CFW-8, but I intend to mount this as a seperate unit (if
possible) and not intergrating it with the AO-7/ST-7 assembly. Ill try to
night to use the 3,3 focal reducer directly on the scope and then AO-7/ST-7 and
see how that works.... cross your fingers!
take care
Alf J
Steve Stefanik wrote:
> Alf,
>
> I asked the same question several weeks ago. You CANNOT attain focus with
> either a 3.3 or 6.3 focal reducer with the AO-7, MGF 2 focuser (or CFW-8)
> behind the focal reducer. Something has TO GO! As you said yourself, there
> is no advantage to using the AO-7 at f/2. Someone did say they were
> successful in attaining focus by placing the focal reducer after the focuser
> before the AO-7 with a specially machined adapter but without the CFW-8. You
> CAN reach focus using a focal reducer with the CFW-8 and ST-7 directly
> coupled together WITHOUT the MGF 2 focuser. I realize what a pain in the a**
> it is to remove the AO-7 and CFW-8 particularly if you have them directly
> interfaced with tiny screws from inside the CFW-8 housing like I do. With
> hindsight Im second guessing myself as to whether the AO-7 is worth all the
> bother considering what little gain one gets in resolution under only
> optimal seeing conditions. I originally bought the AO-7 to "correct"
> periodic drive error on long exposures (of several minutes) but I find
> myself using shorter exposures with TRACK & ACCUMULATE more often now and
> less long exposures with SELF-GUIDE. Id offer to sell you my AO-7 but you
> already have one!
>
> Steve Stefanik
>
> Alf Nilsen wrote:
>
> >Friends,
> >i have just got the Meade f3,3 focal reducer and tried to achieve focus
> >on my LX200 10 f6,3 (reduced to f2) yesterday. I also have the van
> >Slyke MGF2 focuser mounted to the rare port of the scope. I use the
> >ST-7/AO-7 set-up and if possible I want to avoid to remove the AO-7
> >(although I know that it has little effect when operating with f2).
> >
> >So I have:.... LX200 - focuser MGF2 - Focal Reducer f3,3 - AO7 -
> >ST7......, but I had a hard time finding the focus and I did not
> >succeed. Later on I also want to add the CFW-8, but can focus be
> >obtained at all with such set ups ?? Anyone of you using more or less
> >the same set-up ?
> >
> >take care
> >Alf J
> >
> >
