The William Optics Flat6AIII is an apochromatic triplet 0.8x flattener/reducer with STM-coated Ohara lenses. The 44.4mm image circle (43.1mm with the Z103) makes it a perfect match for full-frame sensors.
The Flat6AIII features adjustable spacing for use with a range of cameras and imaging systems. The Flat6AIII includes an M48 filter thread which will hold any standard 2" mounted filter.
Compatible with William Optics GT71, GT81, Z81 & Z103 telescopes which have an M63 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 | 0.8 x |
|---|---|
| Telescope connection | M63 x 1 |
| Camera connection | M48 x 0.75 |
| Image circle | 44.4 mm (43.1mm with the Z103) |
| Backfocus distance | 55mm from M48 thread (after adjustment - see Instructions tab) |
| SKU | WO-P-FLAT6AIII |
Instructions
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.
Distance adjustment needed for correct backfocus
| GT71 | 9.1 mm |
|---|---|
| GT81 | 7.1 mm |
| Z81 | 5.2 mm |
| Z103 | 2.5 mm |
For all orders exceeding a value of 100USD shipping is offered for free.
Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item.
Otherwise, standard shipping charges apply. Check out our delivery Terms & Conditions for more details.
