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Does the NP101is has flat field at 50mm circle edges?

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#1 aacc66

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Posted 29 January 2022 - 08:00 AM

Does the NP101is has flat field at 50mm circle edges?

Does any one has pictures that can share that detail?

I assume that NP101is will have the LC1069 correct on it.

 

Thank you.

 

Alvaro



#2 Spikey131

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Posted 29 January 2022 - 08:35 AM

The manual recommends 40mm as the maximum chip size with the LC1069:

https://televue.com/... Guide_1308.pdf

 

See the chart on page 7

 

You can also call Tele Vue.  They are very helpful on the phone.



#3 aacc66

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Posted 30 January 2022 - 02:09 AM

Thank you.  I got a chance to see the table before, and I was refusing to believe the numbers.  I think I saw a number in their website of 50 mm circle (https://www.televue...._page.asp?id=37), but I think it was referring to another OTA, or was meaning something different.  I think I was hopeful that was the case, but you are right it is about a 40 mm circle.

 

Thanks again.

 

Alvaro

 

The manual recommends 40mm as the maximum chip size with the LC1069:

https://televue.com/... Guide_1308.pdf

 

See the chart on page 7

 

You can also call Tele Vue.  They are very helpful on the phone.

 



#4 alnitak22

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Posted 31 January 2022 - 11:16 AM

Does the NP101is has flat field at 50mm circle edges?

Does any one has pictures that can share that detail?

I assume that NP101is will have the LC1069 correct on it.

 

Thank you.

 

Alvaro

Alvaro….this is from the NP manual…

 

”simply subtract “chip to faceplate” distance from 2.75” to get the spacing required from the Large Field Corrector to your faceplate, for up to 35mm formats.  For larger formats, such as 53mm diagonal, use 2.67” instead of 2.75”.  Use threaded Imaging System components to bring you as close as possible.”

 

Hope this helps. It’s from Section 4.2 Prime Focus in the instruction manual. Consider calling TeleVue if it’s still unclear to you.

 

CS,

Clyde



#5 Jeff Morgan

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Posted 31 January 2022 - 06:03 PM

Thank you.  I got a chance to see the table before, and I was refusing to believe the numbers.  I think I saw a number in their website of 50 mm circle (https://www.televue...._page.asp?id=37), but I think it was referring to another OTA, or was meaning something different.  I think I was hopeful that was the case, but you are right it is about a 40 mm circle.

 

Thanks again.

 

Alvaro

 

You could go to Astrobin and do a search for images shot with full-frame sensors and that particular telescope and see if you like the resultant images.



#6 aacc66

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Posted 01 February 2022 - 01:13 AM

Hi Clyde,

 

Thanks for pointing that out.  And yes I recall reading that statement somewhere in the manual.  It is bit stranger as the manual says too that it can only reach a 40mm circle using the LC1069, which is intended to improve the light distribution at the edges up to 40 mm.  This is from the table above in section 4.0.  Why not describe the increased field if you are 2 mm closer on the table.  A bit strange.

 

Any way thank you.

 

Alvaro

 

 

 

Alvaro….this is from the NP manual…

 

”simply subtract “chip to faceplate” distance from 2.75” to get the spacing required from the Large Field Corrector to your faceplate, for up to 35mm formats.  For larger formats, such as 53mm diagonal, use 2.67” instead of 2.75”.  Use threaded Imaging System components to bring you as close as possible.”

 

Hope this helps. It’s from Section 4.2 Prime Focus in the instruction manual. Consider calling TeleVue if it’s still unclear to you.

 

CS,

Clyde

 



#7 aacc66

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Posted 01 February 2022 - 01:13 AM

You could go to Astrobin and do a search for images shot with full-frame sensors and that particular telescope and see if you like the resultant images.

Jeff,

 

I'll probably do that.

 

Thanks.

 

Alvaro




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