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where can I buy a 4" focuser or a Astro-Physics one

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#1 delorehal

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Posted 12 July 2020 - 08:02 AM

I would like to know if Astro-Physics sell focusers and who sell 4" focuser

 

thanks



#2 plyscope

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Posted 12 July 2020 - 08:36 AM

https://www.astro-ph...cuser-adapters/


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#3 delorehal

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Posted 12 July 2020 - 02:07 PM

Thanks,

 

that's odd but I have never gone to their site, as their refractors are (unfortunately) not for me.

Do u have to wait 10 years b4 getting a focuser ?



#4 noisejammer

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Posted 12 July 2020 - 02:46 PM

Starlight Instruments offers a 3.5" model Tak has an 87mm ID version, Moonlite  offers a 3,5" and I think there's a 4" model available from Teleskop Express in Germany.



#5 delorehal

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Posted 12 July 2020 - 02:51 PM

Thanks

 

what are the biggest eyepieces available (not for $$$$$$) ?

I'm waiting a 4" one, but I don't know the prices for 3" and 4" eyepieces and who make them.



#6 gezak22

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Posted 12 July 2020 - 07:07 PM

If you shared your motivation for wanting a 4" eyepiece (or "the biggest eyepiece"), I think you would get more responses. Also, I would post this question in the eyepieces forum.



#7 delorehal

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Posted 12 July 2020 - 11:44 PM

fl = 5000mm



#8 Suavi

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Posted 13 July 2020 - 04:05 AM

I feel that a quality 4" eyepiece would most likely cost an arm and a leg.



#9 noisejammer

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Posted 13 July 2020 - 06:23 AM

The only makers of large aperture eyepieces that I'm aware of are  Siebert Optics and Masuyama. Neither is cheap.



#10 gnowellsct

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Posted 13 July 2020 - 05:08 PM

 There's this eyepiece  

 

And this one, buy two for your binoviewer....



#11 gnowellsct

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Posted 13 July 2020 - 05:12 PM

...but they're not four inch, to be sure



#12 delorehal

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Posted 14 July 2020 - 02:06 AM

these 3" eyepieces are very big and expensive, the ES is much cheaper though

 

I remember Bill Vorce sold cheap 4" eyepieces in the past, at f17 even simple eyepieces should give good result




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