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Newbie NV questions

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#51 Gschnettler

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Posted 27 April 2021 - 02:18 PM

For the Nikon lenses on the PVS-7, how do you compute magnification?

For example, is a 50mm lens pretty much 1:1, so a 200mm lens is 4X?

#52 Mazerski

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Posted 27 April 2021 - 08:15 PM

Eddgie is one of the NV experts and he posted this a few years back and may answer your Q. 

 

https://www.cloudyni...-for-astronomy/

 

At a minimum, read post #1

 

 



#53 Gschnettler

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Posted 28 April 2021 - 08:57 AM

Can you please recommend one 1.25” filter to get started with for 1X observing? I’m looking for what wavelengths you recommend as well as specific brands and products.

I think I’ll start with that one filter plus a 1.2” to 1.25” adapter and then build from there.

#54 Mazerski

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Posted 28 April 2021 - 11:26 AM

A little background will help:

 

Baader 685nm IR is good for seeing lots of stars and darkens the sky somewhat so you have good contrast between stars and sky. The 685 may allow a small amount of nebulosity on M42 and you can see some of the summer star clouds in Sagittarius.

 

Astronomik 642nm IR is the better filter in that more nebulosity shows along with a lot of stars.

 

Baader 7nm CCD Ha vs. Astronomik 6nm... you need Ha to see emission nebula, includes planetary nebula.

 

The 642 IR shows a faint outline of M27 but the Ha filter is needed to see it.

 

My opinion is for star stuff, 642 IR and for nebula, the 6 Ha, both Astronomik.
 

Have you decided on getting the c- mount nosepiece?


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#55 Mazerski

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Posted 28 April 2021 - 02:20 PM

Another thought... if you go with 1x that means you need the RAF Camera adapter... did you look that the place is in Belarus so shipping takes time. I think you would be better off getting the following:

 

== c- mount nosepiece off eBay

== c- mount to 1.25” adapter from Jim at ScopeStuff 

== 1.25” filter or the 2 I suggested

== 50 or 60mm CCD Finder with helical focuser (sell the rings and plate) 

 

Then your off to the races by using hand-held with 7x or using in scope focuser or diagonal



#56 Gschnettler

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Posted 28 April 2021 - 03:55 PM

Thank you for the recommendations.

However you lost me on the 60mm ccd finder. I already have a ZWO 30mm guidescope. So maybe I could use that. But how would it connect?

Edited by Gschnettler, 28 April 2021 - 04:15 PM.


#57 Mazerski

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Posted 28 April 2021 - 04:30 PM

In the first PM I sent you called Newie NV Qs I include a photo of the CCD finder set up - I show it with Mod3 but it works the same with PVS7– sorry I know nothing about ZWO, based on previous posts by others a few years back, a finder with helical focuser is required - I don’t know if finder with diagonal will work. I had a Stellarvue 13x80 finder with 90 degree diagonal and NV would not focus. Don’t know if others have figured out a way around this.



#58 Mazerski

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Posted 28 April 2021 - 05:00 PM

Also, my suggestion was to help you get started at a faster clip and with c-mount, you gain flexibility. 1x views from you LP area is not the same as 1x in the AZ or UT desert.



#59 Gschnettler

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Posted 08 July 2021 - 11:59 AM

Hi. Just getting back into this after a little break.

The main thing I want to see are galaxies. Now that I have a C-mount and 1.25” adapter I think I can (a) put my PVS-7 on my telescope and (b) thread 1.25” filters into it for 1X viewing.

Which filter would be best for seeing the most detail in galaxies?

#60 GOLGO13

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Posted 08 July 2021 - 12:56 PM

Hi. Just getting back into this after a little break.

The main thing I want to see are galaxies. Now that I have a C-mount and 1.25” adapter I think I can (a) put my PVS-7 on my telescope and (b) thread 1.25” filters into it for 1X viewing.

Which filter would be best for seeing the most detail in galaxies?


Probably no filter. Possibly a long pass filter.

Edited by GOLGO13, 08 July 2021 - 12:56 PM.

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#61 Mazerski

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Posted 08 July 2021 - 02:28 PM

Galaxy Viewing: depends on level of light pollution.

 

My sky at Bortle 8 requires the Baader 685nm IR to allow decent contrast between sky and DSO (decent contrast = dark(er) sky) — this is true for galaxies and star clusters (any type). 
 

The Baader 610nm IR allows too much light so it’s not usable in Bortle 8 sky.

 

The Astronomik 642nm IR allows considerable nebulosity to show on bright emission nebula, some planetary nebula look good with 642 and in hand-held mode with Nikon lens, the Milky Way clouds look really nice with 642nm.


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#62 shohin

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Posted 09 July 2021 - 12:11 AM

...

(b) thread 1.25” filters into it for 1X viewing.

...

That lets you use filters with your telescope.  For 1x you have to put the standard objective lens back on.  You'll need a RAF adapter to use filters.




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