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Astrophotography > Cameras > Astromodified DSLR/DSLMs > Sony > Sony Camera DSLM Alpha 7s Astro
Product no.: 49714

Camera DSLM Alpha 7s Astro

$ 2,600.00 incl. VAT, plus shipping costs
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Product description

The modification takes place at the company JTW Astronomy, Netherlands. Here is what they are doing:

The standard JTW modification has 3 features. First of all the colour correcting filter is removed. This is used to make the camera less responsive to red light for regular photography. By removing this we greatly increases the sensitivity of the camera to h-alpha - typically by close to 400%! In the Sony A7s the filter stack also contains the anti-aliasing filter, so the image is sharpened also. The filter stack is also very thick (1.6 mm!), the removal of such a thick filter stack further increases sharpness in the corners of images, particularly with fast optical systems as there is a significant loss of image quality caused by this filter stack.

The next step is to reposition the sensor. This is done with a precision of +/- 0.02 mm. The reason for this is to correct the change to backfocus distance that is caused by removing the thick filter stack. By repositioning the sensor it is possible to retain the autofocus ability with lenses and also infinity focus is retained. The repositioning also keeps the sensor surface at the correct distance from the rear of a lens for the corrected field to be retained.

The combined results of this work results in a camera that is 4x more sensitive than the stock Sony A7s and also yields significantly sharper images than a stock A7s.

Specifications

Capacity


Type of camera
System camera
Sensor type
CMOS Chip
Size of chip (mm)
35,8 x 23,9
Resolution Photograph (Pixel)
4240 x 2832
Images per second
5
Image format
JPEG, RAW
Max. exposure time (min)
0,5
Min. exposure time
1/8000
Interfaces
USB 2.0 , HDMI
ISO range
50 - 409600
Colour camera
yes
Active cooling
no
Type of memory card
Memory Stick Pro Duo, Pro-HG Duo, SD, SDHC, SDXC
Megapixel
12,2
Battery-powered
yes
Battery type
NP-FW50
Operating temperature
0 - 40
Flange focal distance (mm)
18

General


Weight (g)
489
Overall size LxWxH (cm)
12,7 x 9,4 x 4,8

Area of application


AllSky, Meteore
no
Autoguider
no
Moon & Planets
yes
Nebulae & galaxies
yes

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*All prices include VAT plus shipping costs.

Sony Camera DSLM Alpha 7s Astro
Rear view

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