FLAT68III 1x FLATTENER FOR FLT91, FLT120, FLT132, FLT156
William Optics
FLAT68III 1x FLATTENER FOR FLT91, FLT120, FLT132, FLT156 is backordered and will ship as soon as it is back in stock.
The William Optics Flat68III is an apochromatic triplet 1x field flattener with STM-coated Ohara lenses. The 44.4mm image circle (43.4mm with the Z126) makes it a perfect match for full-frame sensors.
The Flat68III features adjustable spacing for use with a range of cameras and imaging systems. The Flat68III includes an M48 filter thread which will hold any standard 2" mounted filter.
Compatible with William Optics FLT91 (with adapter), FLT120, FLT132, FLT156, GT102, GT153, & Z126 telescopes which have an M92 x 1 thread. On the camera side there is an M48 x 0.75 male thread, which will accept any wide T-ring.
Note: As this is an adjustable flattener, you must adjust the distance for your specific telescope. See the Instructions tab above.
Specifications
| Reduction factor | 1.0 x |
|---|---|
| Telescope connection | M92 x 1 |
| Camera connection | M48 x 0.75 |
| Image circle | 44.4 mm (43.4mm with the Z126) |
| Backfocus distance | 55mm from M48 thread (after adjustment - see Instructions tab) |
| SKU | WO-P-FLAT68III |
Instructions
Distance adjustment needed for correct backfocus
| FLT91 | 5 mm |
|---|---|
| FLT120 | 10.7 mm |
| FLT132 |
7.7 mm |
| FLT156 |
2.6 mm |
| GT102 |
13.6 mm |
| GT153 |
2.8 mm |
| Z126 | 3 mm |
Note: Once you have unscrewed the rear adapter to the appropriate value in the table below, the remaining backfocus distance to make up will be 55mm from the rear M48 thread.
