Nikon D3100 on EdgeHD 8"

[souls33k3r]

Hi All,

I have just recently made a few little purchases to get my feet wet with Astro imaging.

I live in light polluted skies so am in need of a light pollution filter. 

The issue is, I don't have any back focus left to play with. The reducer 0.7x, EdgeHD t-adapter, Nikon DSLR T-ring and DSLR eat up the complete 133.5 mm. The only way to introduce a  light pollution filter as far as I think would be to get rid of the EdgeHD t-adapter and replace it with spacers giving enough room for a light pollution filter to somehow screw somewhere in the image train but I don't know where and what is required. 

Unfortunately I do not have the funds to buy something else right now or be able to replace my existing Nikon D3100 DSLR which I bought many many moons ago when it was first released.

Just want to pick people's brains here on this.

Thanks

[John78]

How thick is the T-ring?  I 3d printed a holder to take an 1.25" filter which fits below the removable threaded ring inside the T-ring - appears to work fine.

[souls33k3r]

I have no clue how thick the t-ring is unfortunately but it's the standard Nikon t-ring

[knobby]

Isn't the 133mm for no reducer , and 105mm when using reducer ...

[Chris]

Can you fit the DLSR with a clip in filter?

[knobby]

11 minutes ago, Chris Lock said:

Can you fit the DLSR with a clip in filter?

On the Astronomic site, it's says only Canon .

[Ken82]

The baader "protective t ring " will give you internal spacing to fit an Idas lp filter whilst retaining the spacing . This is what I use with my edge 

[knobby]

1 hour ago, knobby said:

Isn't the 133mm for no reducer , and 105mm when using reducer ...

Just had a Google, looks like the edge T adaptor unscrews to give 50 mm or 78 mm lengths (+ the 55ish for a DSLR spacing giving 105 or 133 as needed for reducer or no reducer)

Doesn't answer the lp filter question though 

[souls33k3r]

15 hours ago, Ken82 said:

The baader "protective t ring " will give you internal spacing to fit an Idas lp filter whilst retaining the spacing . This is what I use with my edge 

Ken, can't seem to locate the baader protective t rin for Nikon, would you mind giving me the link to that? Thanks mate

14 hours ago, knobby said:

Just had a Google, looks like the edge T adaptor unscrews to give 50 mm or 78 mm lengths (+ the 55ish for a DSLR spacing giving 105 or 133 as needed for reducer or no reducer)

Doesn't answer the lp filter question though 

Knobby, mate i thought that the T-adapter has 48mm spacing but you're right, it does unscrew but not sure what do i need to make it fit the filter. You're correct in saying that without the reducer it's 133.5mm back focus and when the reducer is introduced, the back focus is dropped down to 105mm. 

[knobby]

What's the internal diameter of the T adaptor, wondering if a 1.25" filter might fit inside somehow ?

[souls33k3r]

It's a large enough barrel but i have no idea. I'll be very interested in knowing how Ken has got it done and i hope he has a Nikon DSLR as well

[knobby]

This http://www.telescopehouse.com/astro-imaging/camera-adaptors/revelation-t-adaptor-1-25.html would attach to T ring and using the original visual back allow a 1.25" filter to screw into the end.

Roughly 105 mm but a bit insecure and may vignette due to the 1.25" opening ...

[Ken82]

Ah really sorry souls I just assumed baader also did this for Nikon , I use a canon 6d and 70d. Perhaps send baader an email as it may be in the pipeline ?? 

[souls33k3r]

On 08/10/2016 at 09:46, Ken82 said:

Ah really sorry souls I just assumed baader also did this for Nikon , I use a canon 6d and 70d. Perhaps send baader an email as it may be in the pipeline ?? 

It's ok mate,  no need to be sorry you did get me looking in to this