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Filter placement in image train (Topic Revisit)

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7 replies to this topic

#1 Lostone

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Posted 12 January 2020 - 06:36 PM

I'm requesting this information again, since the last time I posted it, it didn't get properly answered.  Anyway here I go again.

 

I have an Esprit 100ED, Starizona Flattener/Reducer, ASI 294MC, Starizona Filter Slider.

 

The question is where is the best practice to placing the filter?????  Should it be right after the Flattener or Right before the camera?  or does it matter?

 

Knowing where this should go will help in figuring out the 58.5mm back focus I need.  Yes I said 58.5mm (According to Starizona when using the APEX ED and a filter you need 58.5mm)



#2 OldManSky

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Posted 12 January 2020 - 07:53 PM

IMHO, as close to the camera as you can get it.  So if you can do camera->filter slider->spacers->flattener, that would be ideal.


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#3 iwannabswiss

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Posted 13 January 2020 - 04:03 PM

IMHO, as close to the camera as you can get it.  So if you can do camera->filter slider->spacers->flattener, that would be ideal.

Agreed



#4 Lostone

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Posted 14 January 2020 - 09:58 PM

Now if I can just find the right spacers that will allow me to add another 3mm, I should be happy.

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#5 Waldemar

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Posted 15 January 2020 - 01:39 AM

Is this what you are looking for?

https://agenaastro.c...-extension.html



#6 Lostone

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Posted 19 January 2020 - 01:03 PM

Is this what you are looking for?

https://agenaastro.c...-extension.html

Close.  Since I purchased the Reducer and the Filter Slider from Starizona, I drove the 1.5 hours to there shop for the help.  They had just what I was looking for. and I purchased a 22.5mm extension. Removed the 16.5 and  replaced it with the 22.5 and proper placement and vala, I now have the proper 58.5mm backfocus I need.



#7 Akwilliams

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Posted 21 January 2020 - 09:33 AM

Could always just get one of these

 

https://www.firstlig...flatteners.html

 

It goes between the focuser and the flattener.  



#8 Lostone

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Posted 21 January 2020 - 04:35 PM

Could always just get one of these

 

https://www.firstlig...flatteners.html

 

It goes between the focuser and the flattener.  

I have one,  but it defeats the purpose of having the filter slider set.




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