Sony RX100 M4 Attached to Telescope

Prolog... | Eyepiece and Adapters | Camera Attached to Eyepiece | Camera Attached to Skymax-102 Telescope | Camera Attached to Skymax-102 Telescope as a Spotting Scope | Camera Attached to Skymax-127 Telescope | References

On this page, I demonstrate how I attach the Sony RX100 M4 to a telescope eyepiece with a T-mount filter thread for taking astro photos using the projection technique. Projection technique means that the camera is mounted to the eyepiece, not directly to the telescope. The latter technique can only be used with SLR cameras where the body can be directly attached to the telescope - typically using a T mount adapter.

BTW: I mention the 1:50 method on this site several times. This is a simple variant of the projection technique - you hold the camera by hand to the eyepiece instead of attaching it firmly...

 

Prolog...

At the beginning a few warnings:

 

Eyepiece and Adapters

Here, you can see the Revelation 32 mm DigiScope eyepiece and the two adapters needed to mount the Sony RX100 M4 with Lensmate filter adapter to the eyepiece. A second adapter, a step-down ring 52-37*, is required, because there is no T-mount adapter available, which directly fits the filter thread of the Lensmate filter adapter (52 mm). You can remove the upper part of the eyepiece including the eyecup to reveal the T-mount filter thread.

*) The respective Baader DT ring adapter is no longer available. I found the step-down ring on the Internet, and it looks nearly like a DT ring (and works like one)...

         

Top: Baader Digital Camera T-mount adapter M37/M42 (#2408165); bottom left: Lensmate filter adapter for Sony (52 mm); bottom right: Step-down ring M37/M52

 

Top: Step-down ring M37/M52, left: Baader Digital Camera T-mount adapter M37/M42 (#2408165); right: Lensmate filter adapter for Sony (52 mm)

 

Ditto; bottom: Revelation 32 mm DigiScope eyepiece with eyecup

   

Left: Revelation 32 mm DigiScope eyepiece, T-mount thread visible (the eyecup lies below it)

 

Revelation 32 mm DigiScope eyepiece with nearly all adapters for mounting the eyepiece to the RX100 M4, Lensmate adapter still not screwed on

 

Dito, Lensmate adapter attached; now you just need to attach the camera to the Lensmate bayonet

 

Camera Attached to Eyepiece

Here, you can see the Sony RX100 M4 attached to the Revelation 32 mm DigiScope eyepiece:

    

    

 

 

Camera Attached to Skymax-102 Telescope

Here, you can see the Sony RX100 M4 attached to the Sky-Watcher Skymax-102 telescope (Maksutov-Cassegrain) and the Revelation 32 mm DigiScope eyepiece.

Attention: The small Dobsonian base (taken from the Heritage 100P) is extremely wobbly and shaky and therefore not a "recommendation," but only shown here for demonstration purposes. If I actually use this base, I hang the camera's shoulder strap around my neck to avoid the worst! Alternatively, I use a photo tripod for this configuration.

    

    

Skymax-102 on small Dobsonian base from Heritage 100P

 
 

Ditto, detail views

           

Skymax-102 with zenith mirror on a photo tripd

Results

    

Zoomed in (54 mm equiv.)

 

Ditto

 

Camera Attached to Skymax-102 Telescope as a Spotting Scope

Here, you can see the Sony RX100 M4 attached to the Sky-Watcher Skymax-102 telescope (Maksutov-Cassegrain) and the Revelation 32 mm DigiScope eyepiece. In addition, I use an Amici prism for getting a correct view for daylight.

Attention: The small Dobson base (taken from the Heritage 100P) is extremely wobbly and shaky and therefore not a "recommendation," but only shown here for demonstration purposes. If I actually use this base, I hang the camera's shoulder strap around my neck to avoid the worst! Alternatively, I use a photo tripod for this configuration.

    
    

Skymax-102 on small Dobsonian base from Heritage 100P

 
 

Ditto, detail views

       
     

Different zoom steps: wide angle (left), tele (right)

 
 

Skymax-102 with Amici prism on a photo tripd

Results

At Home...

         
         
 
 

Photo data: March 2, 2018, ISO 1600, focal length 50 mm (equiv.)

At the Binshof Lakes Near Speyer

         
         
   
         
 
 
         
   

Photo data: March 4, 2018, ISO 800, focal length 52 mm (equiv.)

 

Camera Attached to Skymax-127 Telescope

Here, you can see the Sony RX100 M4 attached to the Sky-Watcher Skymax-127 telescope (Maksutov-Cassegrain) and the Revelation 32 mm DigiScope eyepiece. It is mounted on my Sky-Watcher Star Discovery mount.

         
         
 
 
         
   

Results

Daylight

         

Zoomed in (50 mm equiv.)

 

Ditto

 

Dito

Moon

The following photos of the moon were taken on March 25, 2018 using the projections method, that is, with the Sony RX100 M4 attached to the eyepiece. I used ISO 800 and mostly underexposed EV -1 to avoid blowing the highlights. I used the Sky-Watcher Skymax-127 OTA with a 32 mm Digiscope eyepiece with T-mount.

    

2700 pixels

 

2700 pixels

The following photos of the moon were taken on March 29, 2018, two days before Full Moon, using the projections method, that is, with the Sony RX100 M4 attached to the eyepiece. I used ISO 400 and 200 and underexposed EV -2 to avoid blowing the highlights. I used the Sky-Watcher Skymax-127 OTA with a 32 mm Digiscope eyepiece with T-mount.

    

2200 pixels (ISO 400, 28 mm equiv.)

  2700 pixels (ISO 200, 35 mm equiv.)

 

References

 

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30.03.2018