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Adding a filter draw to a Redcat 51

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#1 MFarrell_uk

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Posted 06 December 2021 - 05:20 AM

Been shooting with a Redcat 51 with a Nikon D810 with a light pollution clip-in filter and love it. I now want to start a bit of narrowband with a dual band filter.

1, Rather than screw it inside of the Redcat I would prefer to fit a filter draw but will I still be able to get focus as this will add 21mm?

2, Also, if I focus without the filter in the draw and then add it, will I still have correct focus? I have heard it can be harder to focus with a filter fitted.

Any help most welcome.



#2 doole

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Posted 06 December 2021 - 12:21 PM

Are there filter threads on the front? Just a thought. Not sure that thing has much back focus.


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#3 licho52

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Posted 07 December 2021 - 09:30 PM

Yes, adding 21mm drawer is easy and painless, you get focus and everything no problem.  I am using the ZWO version.


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#4 MFarrell_uk

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Posted 08 December 2021 - 07:17 AM

Thanks licho52. I was looking at the ZWO version as well. I will give it a try. Do you have trouble getting focus with a narrowband filter in the draw?



#5 Enance42

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Posted 08 December 2021 - 08:29 AM

Focus will not be a problem with a narrowband filter, just add a few seconds to the exposure time when focusing.
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#6 licho52

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Posted 08 December 2021 - 08:11 PM

Yes, there are no problems focusing at all.  Overall using a Redcat is an easy and painless experience.  Best starter photo scope that you will likely keep forever.

 

EDIT: and it makes snobs livid, an extra bonus.


Edited by licho52, 08 December 2021 - 08:12 PM.

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#7 MFarrell_uk

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Posted 23 December 2021 - 11:24 AM

Thanks licho52. I was looking at the ZWO version as well. I will give it a try. Do you have trouble getting focus with a narrowband filter in the draw?

Hi, I went and got a ZWO filter draw. Fitted it all no problem but I cannot get focus. Did you remove your camera tilt fine adjuster from the Redcat?



#8 licho52

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Posted 23 December 2021 - 12:16 PM

No, just attached the drawer and then I have 17.5mm distance to the sensor in 2600MC camera.



#9 MFarrell_uk

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Posted 24 December 2021 - 01:14 PM

No, just attached the drawer and then I have 17.5mm distance to the sensor in 2600MC camera.

Ah right. I am using a DSLR with an adapter and that all adds up to too much. I will try without the tilt fine adjuster. It might be enough.




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