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Linear binoviewer FOV increase

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#1 DRodrigues

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Posted 21 August 2023 - 07:27 PM

The linear binoviewer have the advantage of equivalent to Zero light path i.e. doesn't change focus position of the eyepieces. However have some different characteristics that can minimize their usability as the case of erecting the images and the clear aperture of 17.3mm.

The image erecting characteristic is interesting for those that want to do straight observation with telescopes, that is my daylight case. So I remembered to use also a Siebert PMW with 3x increasing factor (old model with 4 lens cells), with a pair of Baader Morpheus 14mm, to avoid vignetting. With this setup the minimum magnification should be 36x, that might be a limiting factor for some people but not really for me.

 

 

 

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  • TMB92_PMW3x_LBV_Morpheus14.JPG

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#2 DRodrigues

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Posted 21 August 2023 - 07:29 PM

The minimum magnification image quality and AFOV are great. However, when "zooming" vignetting start to visible at the 3rd mag position and increases with the following mags - the attached image show the minimum and maximum magnification AFOVs.

TMB92_PMW3x_LBV_Morpheus14_FOV1_3x.jpg



#3 DRodrigues

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Posted 21 August 2023 - 08:01 PM

So I remembered to test if the 2" TS 0.5x reducer would work well - I remembered using the 2" to try to avoid vignetting.

The reducer was positioned just before the 2" to 1.25" adapter, after the PMW.

TMB92_PMW3x_red2TS0.52x_LBV_M14.JPG

 

The FOV increased 68% and no longer shows vignetting increasing magnifications - photo show AFOVs of the minimum and maximum magnification - 2.79x increase factor! The resulting magnifications should range from 24.6 to 68.6x! 

TMB92_PMW3x_red2TS0.52_LBV_Morpheus14_FOV1_3x.jpg

 

Now a pair of Morpheus 12.5mm or a pair of APM HI-FW 12.5 / Doctor 12.5mm, start to tempt me - 28.7-80x... wink.gif

Don't know if a pair of Morpheus 9mm wouldn't be too much - 41.1 to 114.7x... grin.gif

 

Will test this solution with a C5, when will have time available...



#4 DRodrigues

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Posted 21 August 2023 - 08:05 PM

Just remembered to mention that the APM SuperZoom shows vignetting with both solutions, although reduced with the second. Vignetting disappears at the 14mm position.

Will test the Baader zoom also. 



#5 DRodrigues

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Posted 22 August 2023 - 07:37 PM

...

 

Now a pair of Morpheus 12.5mm or a pair of APM HI-FW 12.5 / Doctor 12.5mm, start to tempt me - 28.7-80x... wink.gif

...

Just to let you know that the APM and Docter 12.5mm are out since probably will vignette, because have FS >19mm...

 

If any of you use successfully any of these 2 eps with the LBV, please let us know.
 


Edited by DRodrigues, 22 August 2023 - 08:09 PM.

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#6 DRodrigues

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Posted 25 October 2023 - 06:02 PM

...

Will test the Baader zoom also. 

There is no vignetting with the Baader zoom, at least with the second solution!

On the second solution I added a 5mm 2" spacer between the reducer and the 2" to 1.25" adapter, to avoid that the 1.25" nose-piece of the LBV touches the reducer lens. 
 


Edited by DRodrigues, 25 October 2023 - 06:02 PM.


#7 DRodrigues

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Posted 19 November 2023 - 03:46 PM

The LTX115!!!

See more at https://www.birdforu...64/post-4556001

 

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  • X115_TS2_0.5x_LBV_BaaderM14.JPG


#8 DRodrigues

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Posted 21 November 2023 - 03:38 PM

So I remembered to test if the 2" TS 0.5x reducer would work well - I remembered using the 2" to try to avoid vignetting.

...

The FOV increased 68% and no longer shows vignetting increasing magnifications - photo show AFOVs of the minimum and maximum magnification - 2.79x increase factor! The resulting magnifications should range from 24.6 to 68.6x! 

...

For those that didn't the maths, it would be like using a pair of Morpheus 23.5mm (that don't exists...), on a Baader MKV, that probably would show vignetting...
 



#9 titanio

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Posted 16 April 2024 - 05:40 AM

Hi, 

 

You can use a kasai 1,25"  0.66X reducer threaded to the binoviewer.

 

 

Greetings

 

Toni



#10 DRodrigues

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Posted 21 April 2024 - 03:21 PM

...

 

You can use a kasai 1,25"  0.66X reducer threaded to the binoviewer.

 

...

I know, but I didn't found a seller within EU. Did you?
 



#11 titanio

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Posted 22 April 2024 - 04:03 AM

Only in Japan,  you must send an e-mail to kasay trading and ask for it, he will give you all the information and the paypal address, once you made the payment he will ship the kasai reducer.

 

This is the dealer:

 

Kasay trading

 

korder@kasai-trading.jp

 

Around 50 euro total cost 

 

Greetings

 

Toni


Edited by titanio, 22 April 2024 - 04:07 AM.

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#12 DRodrigues

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Posted 22 April 2024 - 05:19 PM

Only in Japan,  you must send an e-mail to kasay trading and ask for it, he will give you all the information and the paypal address, once you made the payment he will ship the kasai reducer.

 

This is the dealer:

 

Kasay trading

 

korder@kasai-trading.jp

 

Around 50 euro total cost 

 

Greetings

 

Toni

I know (I contacted them looking for a EU seller...), but I fear the EU customs taxes that can result on more than 2x the original cost...



#13 titanio

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Posted 23 April 2024 - 09:22 AM

You will pay 21 % VAT plus around  6% customs duty 

 

Greetings

 

Toni




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