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Skywatcher Esprit-80 and Esprit-100 Incoming

FLO

By FLO
in Sponsor Announcements and Offers

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Gina

Gina

Posted
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Apologies didn't mean to post link to another supplier in the the sponsors  section

That was me - and again I must apologise - sorry Steve :(  I'm not with it today - all sorts of problems.  That link wont work anyway - still too much back focus.  I haven't found an answer other than to make (or get made) a special adapter to connect the SW FF or adapter to the Atik EFW2 :(

I'd better not post any more here I think...  "I'll get me coat"

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FLO

FLO

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I'm afraid I have an apology to make Steve - I was wrong about the adapter supplied with the flattener - it's 48mm not T2, so you were right.  Sorry about that.

No problem :smiley:

If you are looking for a lower profile (than ours) M48-T2 adapter try Altrair Astro, I think they offer one. 

Thread adapters are tricky things to design. We chose 10mm because it enables us to make it stronger and include a knurled grip but I do understand some will need a slimmer profile  :smiley:

Steve 

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Gina

Gina

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It's a struggle to get the EFW2 and 460EX (or other CCD) to fit within the FF back focus requirement let alone an OAG :(  I shall be making a special adapter to connect the FF to the EFW2 when I get my mini lathe.

I'm going to try Esprit 80ED without the FF first - no problem then.

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Tim

Tim

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It's a struggle to get the EFW2 and 460EX (or other CCD) to fit within the FF back focus requirement let alone an OAG :(  I shall be making a special adapter to connect the FF to the EFW2 when I get my mini lathe.

I'm going to try Esprit 80ED without the FF first - no problem then.

Is it 46mm with the 460+FW+filter?

On the f7 150ED I can use the 460ex without need for the FF, be interesting to see the 80 without it

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jezhughes

jezhughes

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The next delivery of Skywatcher Esprit-80 and Esprit-100 telescopes have arrived, earlier than expected :smiley:

Backorders have been processed and will be dispatched tomorrow for delivery Monday. 

Thank-you   :icon_salut:

Woo! I ran up the stairs to my computer about 30 seconds after getting the stock e-mail, then completed the order in another 90 seconds. I hope i was quick enough this time?! ha

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Gina

Gina

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Is it 46mm with the 460+FW+filter?

On the f7 150ED I can use the 460ex without need for the FF, be interesting to see the 80 without it

With the flattener it adds up like this :-

  1. 460 - 13mm
  2. EFW2 - 22mm (camera to FW is zero as the adapter is flush with the FW surface) = 35mm
  3. Atik 54mm to T2 adapter rim - 1.5mm = 36.5mm
  4. ??? connection T2 to 48mm SW adapter.  Male thread on adapter extends 6mm = 36.5 + 6 + thickness of 48mm to T2
  5. 48mm to 65mm SW adapter (takes you up to the FF surface) - 11mm = 53.5 + thickness of 48mm to T2

So with a required back focus of 54.9mm we are left with 1.4mm for a 48mm to T2 adapter.  I think an adapter from a wrell known German telescope adapters supplier, which screws onto the end of the 48mm male thread, might be just about right.

Tonight's local weather forecast predicts some clear skies around 9 or 10pm and I have the Esprit 80ED set up without the FF so I'm hoping to find out how well it works with the 460EX.

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Gina

Gina

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Although conditions aren't very good I have done a test with the Atik 460EX on the Esprit 80ED without the flattener, and the focus is decidedly soft around the edges compared with the middle.

CONCLUSION - Without the flattener there is noticeable field curvature with the Atik 460EX. :(

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jezhughes

jezhughes

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Although conditions aren't very good I have done a test with the Atik 460EX on the Esprit 80ED without the flattener, and the focus is decidedly soft around the edges compared with the middle.

CONCLUSION - Without the flattener there is noticeable field curvature with the Atik 460EX. :(

:mad:

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FLO

FLO

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Although conditions aren't very good I have done a test with the Atik 460EX on the Esprit 80ED without the flattener, and the focus is decidedly soft around the edges compared with the middle.

CONCLUSION - Without the flattener there is noticeable field curvature with the Atik 460EX.  :(

Don't worry Gina, we should expect field curvature when using a fast f5 triplet without a field flattener. That is why Skywatcher went to the trouble of making an optically-matched field flattener. 

You would probably notice curvature using a 314L+ so your 460EX, with a significantly larger sensor, will definitely need the field flattener. 

HTH :smiley:

Steve 

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Gina

Gina

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Don't worry Gina, we should expect field curvature when using a fast f5 triplet without a field flattener. That is why Skywatcher went to the trouble of making an optically-matched field flattener. 

You would probably notice curvature using a 314L+ so your 460EX, with a significantly larger sensor, will definitely need the field flattener. 

HTH :smiley:

Steve 

I rather expected this after reading reports elsewhere saying you definitely need the flattener even with relatively small CCD sensors.  That's why I ordered it with the scope.  It shouldn't be too long before I get the right spacing for the flattener now and could well be ready for when the next clear night comes along :D

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Gina

Gina

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Can't you go from the FF to the FW using a custom adapter?

Indeed you could.  An adapter with 65mm female thread to 54mm male thread and 18.9mm long by my reckoning.

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Tim

Tim

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Indeed you could.  An adapter with 65mm female thread to 54mm male thread and 18.9mm long by my reckoning.

If you go for that, get a couple of spacers made too, to allow maybe +/- 2mm either side, 

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