Small Sized Camera + Camera Lens/Telescope With Flattener - QHYCCD QHY183 Manual

7
SCENARIO II ：SMALL SIZED CAMERA + CAMERA LENS/TELESCOPE WITH FLATTENER
As aforementioned, the back focus of DSLR lens is fixed. Therefore, the optimal back focus distance (OBFD) in such
setup must be met strictly. This is applicable to telescope flattener, which can be considered as a lens. The only
difference is the mounting method, bayonet mount for camera lens and regular threaded mount for flattener.
To reach the OBFD in such system, the fine adjustment adapters can be used: the 20090 (small size)/020089 (medium
sized) are comprised of 5 different pieces of adapter of 0.5/1/2/3/7mm respectively. They can be combined into
various thickness to meet specific demands. Tailored screw may require for the adapter(s).
While using the fine adjustment adapters in small sized camera, the external adapter (020085) needs to be replaced
by threaded external adapters (020056 and 020083). The 020083 is included in the standard package of small off
axis guider (OAGS)
Model
020056
020083
020090
020072/
020074
Back focus consumed
3mm
3mm
External adapter 4mm；
Fine adjustment
adapters13.5mm
（0.5+1+2+3+7）
10mm
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Where to acquire
Purchased separately
Purchased separately
Purchased separately
Purchased separately
（72 for CANON EF
MOUNT，74 FOR
NIKON F MOUNT）
Whether tailored
screws are needed
Likely