#21  
Old 24-02-2020, 03:51 PM
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gregbradley
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wow, what a story.

This is why I only get high end gear even if its a stretch.

My CFF 105 F6 gets round stars to the corners of a 16803 CCD.

Greg.
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  #22  
Old 24-02-2020, 07:19 PM
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Ant0nio (Tony)
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Quote:
Originally Posted by casstony View Post
At least the new scope is guaranteed to be good since it's being tested by the supplier. I assume you're getting the reducer/flattener with the scope?
Yes, definitely getting the proprietary reducer/flattener Tony. My understanding is that Adriano tests both items prior to shipping.

Quote:
Originally Posted by gregbradley View Post
wow, what a story.

This is why I only get high end gear even if its a stretch.

My CFF 105 F6 gets round stars to the corners of a 16803 CCD.

Greg.
I would normally try to follow the same rationale Greg. I had my heart set on the Petzval style but the cost of an FSQ85 & associated add ons was more than I could spring for.
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  #23  
Old 24-02-2020, 08:28 PM
Ukastronomer (Jeremy)
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Quote:
Originally Posted by gregbradley View Post
wow, what a story.

This is why I only get high end gear even if its a stretch.

My CFF 105 F6 gets round stars to the corners of a 16803 CCD.

Greg.
I did consider an oil spaced triplet but all advice was not when imaging the Sun
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  #24  
Old 25-02-2020, 05:53 AM
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Slawomir (Suavi)
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Originally Posted by Ukastronomer View Post
I did consider an oil spaced triplet but all advice was not when imaging the Sun
That’s interesting, since both Roland and Yuri have said it was perfectly fine to use their oil-spaced telescopes with a Herschel wedge.

I have also read that 80mm CFF (oil-spaced) was designed as a portable high quality scope for capturing images during total solar eclipses.

Might be best contacting the manufacturer (CFF) to confirm that.
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  #25  
Old 25-02-2020, 06:11 PM
Ukastronomer (Jeremy)
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I use a Quark on the triplet and you do not need a filter on the front of the scope at 120mm, you are told to with oil due to heat
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  #26  
Old 25-02-2020, 06:36 PM
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Slawomir (Suavi)
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Originally Posted by Ukastronomer View Post
I use a Quark on the triplet and you do not need a filter on the front of the scope at 120mm, you are told to with oil due to heat
That’s news to me - a telescope’s lens getting hot when exposed to the sun (not talking mirrors here).

Apart from Roland, Yuri, CFF also Baader claims that oil-spaced lenses are great for solar observations/imaging:

[oil-spaced lenses] are great for observing the sun – even and especially with our Cool Ceramic Herschel Wedge. The oil doesn't suffer or deteriorate under long usage (UV-radiation). We do not use a classical "oil". Carl Zeiss invested a decade of research into the development of the fluid which is used for these lenses today – and they gave a 30-year-warranty, which is now fulfilled by us.


Apologies for getting off the topic
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