Characteristics Of The Modification - Nikon CentraIDS Astro D850 User Manual

CENTRALDS ASTRO D850 USER GUIDE
Characteristics of the modification
• Astro D850 is modified versions of Nikon's general purpose DSLR cameras. Some
of original features of the Nikon camera are removed and new features such as TEC
cooling and general purpose Drop-In filter holder are added for high quality
astrophotography. Followings are the differences made by the modification.
1.
Low Pass Filter of original CMOS
sensor was removed.
2.
In Astro D850 Hoya Clear filter
installed , and image blurring can
occur due to chromatic aberration
on the infrared lights recorded on
the sensor so the image sharpness
can suffer.
This is more pronounced in the
images taken with refraction optics
than reflection optics.
We recommend you to install in
Drop-In filter holder UV/IR cut
filter, light pollution filter and deep
sky filter at the same time while
imaging.
3. With Astro D850, you can take IR
images by mounting a visible light
blocking / infrared transmitting filter
such as a Hoya R72 filter.
4. Various 2" imaging filters or 52mm filters can be mounted in the Drop-In filter holder.
5. Drop-In Filter system(CM2C/ CM2N) does not have the communication contact points so the auto
focus, lens information recording and pulse signal transfer for motor operation which are based on
the communication between the camera body and the lens are disabled even when a Camera lens is
used.
6.
In case of Drop-In Filter system(CM2C/ CM2N) you always have to focus lenses manually. Some
lenses need power from the body for manual focusing and you cannot focus these lenses even
manually when they are mounted on Astro D850.
7. View Finder was disabled.
8. Shutter speed control by Mechanical shutter is not valid in sub-second exposure, only be valid in Bulb
Shutter mode.If you are to take sub-second shots, use electric shutter mode [= 'silent live view
photography' setting ].
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