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Focal Reducers
- Keith g
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18 years 10 months ago #22364
by Keith g
Focal Reducers was created by Keith g
Hi, Just a quick question - Can I fit an f6.3 focal reducer to a 80mm or 100mm refractor, or are they exclusively used for SCT's?? :
Thanks, Keith..
Thanks, Keith..
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- dmcdona
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18 years 10 months ago #22388
by dmcdona
Replied by dmcdona on topic Re: Focal Reducers
Keith - you can certainly get focal reducers for refractors - they're not exclusive to reflectors (they're a negative barlow).
Have a lash at google to see if there's any that would suit your OTA.
e.g.
www.telescopehouse.co.uk/page.aspx?f=on&...Y8AedOGEYs7CF5zA1pHa
Cheers
Dave
Have a lash at google to see if there's any that would suit your OTA.
e.g.
www.telescopehouse.co.uk/page.aspx?f=on&...Y8AedOGEYs7CF5zA1pHa
Cheers
Dave
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- Seanie_Morris
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18 years 10 months ago #22389
by Seanie_Morris
Midlands Astronomy Club.
Radio Presenter (Midlands 103), Space Enthusiast, Astronomy Outreach Co-ordinator.
Former IFAS Chairperson and Secretary.
Replied by Seanie_Morris on topic Re: Focal Reducers
A second Q on the subject, if you don't mind...
What is the benefit of a focal reducer, and how does it work?
...ok, its 2 questions rolled into 1!
Seanie.
What is the benefit of a focal reducer, and how does it work?
...ok, its 2 questions rolled into 1!
Seanie.
Midlands Astronomy Club.
Radio Presenter (Midlands 103), Space Enthusiast, Astronomy Outreach Co-ordinator.
Former IFAS Chairperson and Secretary.
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- Keith g
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18 years 10 months ago #22395
by Keith g
Replied by Keith g on topic Re:
Seanie, they are primarily used for astrophtography, but visually also, if you have a long focal length scope, they 'reduce' the focal length down to f/6.3 from say my SCT at f/10. This widens the field of view, and it takes less exposure time to shoot your target
Thnaks Dave for that link!
Keith..
Thnaks Dave for that link!
Keith..
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- dmcdona
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18 years 10 months ago #22398
by dmcdona
Replied by dmcdona on topic Re: Focal Reducers
To add to Keith's explaination, the technical description is that they are simply a lens assembly that messes with the light to give you a, er, shorter focal length... And they empty your bank account
Seriously, they also help to flatten the field of view - see the technical description above :
Sheesh...
Seriously, they also help to flatten the field of view - see the technical description above :
Sheesh...
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- Seanie_Morris
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18 years 10 months ago #22402
by Seanie_Morris
Midlands Astronomy Club.
Radio Presenter (Midlands 103), Space Enthusiast, Astronomy Outreach Co-ordinator.
Former IFAS Chairperson and Secretary.
Replied by Seanie_Morris on topic Re: Focal Reducers
Thanks guys! So simple really, but never really understood it! :idea:
Midlands Astronomy Club.
Radio Presenter (Midlands 103), Space Enthusiast, Astronomy Outreach Co-ordinator.
Former IFAS Chairperson and Secretary.
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