Takahashi FS78 f8 for Astrophotography?

[Outcast (Carlton)]

Does anyone out there have any experience using one of these for Astrophotography?

Suitability, issues... great results??

Or should I just keep a lookout for a fast Triplet at a good price?

Thanks in advance

[Outcast (Carlton)]

Bump...

Surely someone out there can comment.. if not specifically on the FS78, maybe something of similar aperture & focal ratio... f8 I think...

Cheers

[LewisM]

It’s a doublet - not perfect for imaging but capable. Certainly better image than 95% of the Chinese doublets and probably 65% of Chinese triplets.

An Esprit 80 triplet for example is slightly better colour corrected but it’s not as sharp.

[Outcast (Carlton)]

Thanks Lewis,

What are the implications of it being f8 vs say, an f6. I understand that exposure times would be longer with a slower scope but, are there any other pitfalls I should consider?

Cheers

Originally Posted by LewisM

It’s a doublet - not perfect for imaging but capable. Certainly better image than 95% of the Chinese doublets and probably 65% of Chinese triplets.

An Esprit 80 triplet for example is slightly better colour corrected but it’s not as sharp.