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Installing a filter on a SW Espirit 100mm refractor?

refractor equipment
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#1 Johnr1960

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Posted 19 April 2019 - 09:51 AM

I am considering the purchase of a Sky Watcher Espirt 100 ED APO and would connect a DSLR on it for photography. I was wondering how I might install a light pollution filter on it. And would this filter go in front of or behind the flattener?

 

Thank you in advance for any replies.

 



#2 Auburn80

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Posted 19 April 2019 - 09:52 AM

One common method is a camera clip in filter. Remove the lens and the filter clips in in front of the sensor.

#3 zakry3323

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Posted 19 April 2019 - 10:10 AM

Drawtube --> Flattener/Reducer --> OAG --> DSLR clip-in filter --> Camera Sensor

 

If you're using a guide scope instead of an OAG, simply omit it.

 

Be sure to measure distance carefully from the imaging sensor to the reducer/flattener, taking into account the thickness of the filter you're planning to get, to get the best star shapes in your photos. For most DSLR's, it's 55mm. 


Edited by zakry3323, 19 April 2019 - 10:43 AM.


#4 skyward_eyes

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Posted 19 April 2019 - 10:39 AM

The only way to use a filter with a DSLR on the Esprit 100 is a clip in. 


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#5 Johnr1960

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Posted 19 April 2019 - 11:47 AM

Thanks. My DSLR (Nikon D850) does not have a clip in made for it. Are there any other refractors in that size range that can have filters installed?



#6 zakry3323

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Posted 19 April 2019 - 12:46 PM

Thanks. My DSLR (Nikon D850) does not have a clip in made for it. Are there any other refractors in that size range that can have filters installed

There are clip in filters available to use with your D850.

https://www.astronom...0-und-d850.html

 

It's not that choosing a different OTA will make manual filter slides or USB powered filter wheels available to your camera, choosing a different refractor won't make a difference. Clip-in filters are what you need to use if you're using a full-frame DSLR. 


Edited by zakry3323, 19 April 2019 - 12:53 PM.


#7 Johnr1960

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Posted 19 April 2019 - 02:16 PM

Thank you sir.


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#8 skyward_eyes

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Posted 19 April 2019 - 04:30 PM

If you eventually move to a dedicated astronomy camera the options for filters on the Esprit 100 (and many telescopes for that matter) great increases. DSLRs eat up a lot of back focus because of the mirror so it limits the use of filters in the system. 


Edited by skyward_eyes, 19 April 2019 - 04:30 PM.


#9 tonyt

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Posted 20 April 2019 - 01:24 AM

The Esprit 80 includes a thread for mounting 2" filters. Why was this feature omitted from the Esprit 100?



#10 zakry3323

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Posted 20 April 2019 - 01:11 PM

The Esprit 80 includes a thread for mounting 2" filters. Why was this feature omitted from the Esprit 100?

I can't say about the Espirts, my Orion ED 80 and SW ED100 have identical focusers and draw tubes (after the upgrade) that facilitate screw-on 2" filters, but I never had any luck doing it that way. 

 

I suspect that the very thin nature of the filter housing introduced tilt into the imagining train, and I also got a lot of vignetting. I disliked the method for imagining, though I'm sure it would be fine for visual. 




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