Description
Lepus Mounting Plates
Camera-Specific Mounts for the Lepus Telecompressor
The Lepus telecompressor has a design back-focus distance of 100mm on-axis. Each of the camera mounting plates below are designed to maintain that back-focus for the best overall image quality and a reduction of 0.62X. Varying the back-focus distance will alter the magnification (reduction) but may introduce undesirable optical aberrations as well. We recommend using the Lepus telecompressor only with the recommended camera-specific mount.
Each camera mount consists of a 2.1″ ID tube of various lengths and a mechanical interface such as a T-thread, C-mount, or STL thread. This ID tube fits over the camera side of the Lepus telecompressor, which features the OPTEC-2100 male circular dovetail mount. The camera mount is held securely to the Lepus dovetail using three oval point setscrews located 120 degrees apart.
It is important that the overall back-focus distance be set as closely as possible to the design distance of 100mm on-axis. Measured from the flange at the bottom of the OPTEC-2100 dovetail, the distance works out to 105mm as shown in the PDF at left.
Most of the mechanical camera interfaces require an additional 1/10th inch or 2.5mm of back-focus. The camera back focus distance, BF, should be known to within about 1mm for best performance and should include the thickness of any filter wheel, off-axis guider or other adapter between the Lepus and camera sensor. Use the table below to find the appropriate mounting plate for many commercially available cameras and configurations. If your camera is not listed below and you know the optical back-focus, BF, and mechanical interface (i.e. T-thread) you can determine the stock number as with the following calculation:
TUBE LENGTH = 105mm – FLANGE THICKNESS – CAMERA BACK-FOCUS
| Mechanical Interface | Flange Thickness | Stock No. Prefix |
| T-thread | 2.5mm | #19392 |
| Pentax thread | 2.5mm | #19395 |
| SCT thread | 2.5mm | #19396 |
| STL 2.156″ thread | 2.5mm | #19398 |
| C-mount | 2.5mm | #19399 |
| Canon and Nikon DSLR requires T-thread and brand specific bayonet mount. |
varies with bayonet |
#19392 |
Next use the TUBE LENGTH value calculation above for the suffix. For example, nearly all C-mount cameras share a 17.5mm BACK-FOCUS value. The C-mount stock number prefix is #19399 and the TUBE LENGTH would be equal to 105mm – 2.5mm – 17.5mm = 85mm. The Optec stock number for a C-mount camera would therefore be #19399-85 as shown in the table below.
NOTE: The minimum tube length is limited by the height of the OPTEC-2100 dovetail plus the press-flange of the mechanical mount (usually about 0.2″ or 5mm). The standard Lepus telecomprssor minimum tube length is 15mm while the Edge HD specific Lepus telecompressor is 17mm.
Specifications
| Camera Type | Tube Length (mm) | Thread | Stock No. |
|
Any C-mount camera with standard lens mount
|
85
|
C
|
19399-85 |
| Any CS-Mount Camera | 90 | C | 19399-90 |
| Apogee D02 Housing – U47, U77, U4000, U8300 std. body | 76 | SCT | 19396-76 |
| *Apogee D02 Housing – U9, U10 std. camera | 75 | SCT | 19396-75 |
| *Apogee D06 Housing – U6, U9, U10, U4000 camera | 89 | SCT | 19396-89 |
| Atik Instruments 4000/*11000 | 88 | T | 19392-88 |
| Atik Fira M1 motorized filter wheel | 83 | SCT | 19396-83 |
| *Canon DSLR Camera – Canon bayonet mount | 47 | T plus bayonet | 19392-47C |
| Fishcamp Starfish | 91 | T | 19392-91 |
| Meade Deep Sky Imager | 94 | T | 19392-94 |
| Meade Deep Sky Imager with RGB filter bar | 77 | T | 19392-77 |
| *Nikon DSLR Camera – Nikon bayonet mount | 46 | T plus bayonet | 19392-47N |
| Orion StarShoot Pro | 82 | T | 17482-82 |
| QSI 504 full body camera with filters | 67 | T | 19392-67 |
| QSI 504 full body camera without filters | 67 | T | 19392-67 |
| QSI 504 medium body camera without filters | 79 | T | 19392-79 |
| QSI 504 slim body camera with filters | 88 | T | 19392-88 |
| QSI 516, 532 full body camera with filters | 67 | T | 19392-67 |
| QSI 516, 532 full body camera without filters | 67 | T | 19392-67 |
| QSI 516, 532 medium body camera without filters | 80 | T | 19392-80 |
| QSI 516, 532 slim body camera without filters | 88 | T | 19392-88 |
| QSI 516WSG camera with Off-Axis guider and no filters | 52 | T | 19392-52 |
| QSI 52mm Spacer tuber with clearance for QSI WSG Pick-Off Mirrir | 52 | T | 19392-52QSI |
| QSI 516WSG camera with Off-Axis guider and filters and standard T-thread. Note: T-thread mount must be turned down for clearance of the OAG. |
53 | T | 19392-53Q |
| QSI 583WSG camera with Off-Axis guider STL 2.156x24tpi thread | 49 | STL | 19398-49 |
| QSI 520 full body camera with filters | 67 | T | 19392-67 |
| QSI 520 full body camera without filters | 67 | T | 19392-67 |
| QSI 520 medium body camera without filters | 80 | T | 19392-80 |
| QSI 520 slim body camera without filters | 88 | T | 19392-88 |
|
SBIG ST-7/8/9/10/2000 with CFW-10 filter wheel mounted directly on camera without face plate and with D-block
|
62
|
T
|
19392-62 |
|
SBIG ST-7/8/9/10/2000 with CFW-8/8A/9 with new 0.25 inch thick front plate on camera and no D-block
|
59
|
T
|
19392-59 |
|
SBIG ST-7/8/9/10/2000 new 0.25 inch thick front plate and D-block with T-Thread
|
77
|
T
|
19392-77 |
| SBIG ST-2000XCM with AO-8 | 24 | T | 19392-24 |
| SBIG ST-8300 | 85 | T | 19392-85 |
| SBIG ST-8300 with CFW5/8-8300 | 64 | T | 19392-64 |
| *SBIG STL with 3mm thick filters | 65 | STL | 19398-65 |
| *SBIG STL without filters | 64 | STL | 19398-64 |
| *Starlight Xpress SXVF-H9 camera plus filter wheel | 62 | T | 19392-62 |
|
Starlight Xpress SXV-H9 T-thread camera
|
84
|
T
|
19392-84 |
|
Starlight Xpress SXV-M25C camera
|
84
|
T
|
19392-84 |
| QHY-8 camera (T-mount depth to IR Filter=0.160″ | 81 | T (short) | 19392-81 |
| QHY-8L camera | 82 | T | 19392-82 |
| QHY-8Pro camera (without “tile adjust ring”, add 3mm to BF for ring) | 84 | T | 19392-84 |
| QHY-8 camera with Orion SteadyStar | 41 | T | 19392-40 |
| QHY-9 camera | 102 | T | 19392-102 |
| QHY-9 camera with 2″ color filter wheel | 46 | T | 19392-46 |
| QHY-10 camera | 82 | T | 19392-82 |
| Older Camera Mounts | |||
|
SBIG ST-7/8/9/10/2000 with CFW-8/8A/9 filter wheel with old 0.20 inch thick front plate and no D-block
|
60
|
T
|
19392-60 |
|
SBIG ST-7/8/9/10/2000 with old 0.20-inch thick front plate on camera and D block with T-thread
|
78
|
T
|
19392-78 |
* denotes vignetting may occur with Lepus telecompressor.
| Size | 75, 76, 83, 89 |
|---|
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