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Author Topic: Planostar 0.79 lens to ccd tolerance  (Read 133 times)

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Offline Anne S

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Planostar 0.79 lens to ccd tolerance
« on: 08:42:23, 12 February, 2018 »
Does anyone know the tolerance if I use a SX694 with a Planostar 0.79 reducer, the  3 inch one, on an Altair Wave 102mm super triplet? The recommended spacing is 57mm. The above ccd is approx 15mm diagonal. I gather the smaller the chip, the more tolerance as to distance. I need 59.5mm to run an OAG in the imaging train.

Thanks
Anne
Altair Wave 102, EQ6
Altair Starwave EDT70mm, Ioptron IEQ30pro
SX H694, Superstar guider
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Offline chris.bailey

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Re: Planostar 0.79 lens to ccd tolerance
« Reply #1 on: 09:40:52, 12 February, 2018 »
Anne

I find reducer/flatteners far more sensitive that straight flatteners. The Altair site does say the tolerance is +/- 1mm on large sensors and +/- 2mm on smaller ones but at the end of the day the only way is to try it. The issue I often find is that once you put everything together, the actual measured length of components comes out slight more than the calculation as some spacer elements don't fully screw in to each other or have small machined shoulders that throw it out. I have had to resort to having adapters machined to a lower profile to get it all to work before now.

Chris
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Offline Anne S

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Re: Planostar 0.79 lens to ccd tolerance
« Reply #2 on: 10:06:16, 12 February, 2018 »
I was really wondering which sensors are classified as small. I think the 694 is called a medium size one.
Altair Wave 102, EQ6
Altair Starwave EDT70mm, Ioptron IEQ30pro
SX H694, Superstar guider
Atik 320e colour
Altair Hypercam 178M, Altair Gpcam
Altair Astro Ritchey Chretien 6 inch

 

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