Long Perng 2” Field Flattener for f/5 - f/7 Refractor Telescopes (with M48 Thread)
Availability: Please contact us for an update
Contiguous US Customers:
All items we sell ship for free within the Contiguous US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.
US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.
International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.
- Long Perng 2” field flattener for refractors of focal ratio f/5 to f/7
- Flattens image field for cameras with APS-C or smaller sensors
- Integrated M48 thread for camera attachment (an M42 T/T2 version of this reducer is also available separately)
- CNC machined body with hard, gloss, black anodized finish
- Features 2" nosepiece with safety groove
- Requires 55mm back focus
The Long-Perng 1.0x field flattener # K1.0X-DBU minimizes field curvature caused by the objective lenses of fast refractors and provides a sharper image across the camera sensor.
As a 1.0x flattener, it does not change the effective focal length of the telescope. The optical design of this flattener makes it optimal for use with refractors with a focal ratio of approximately f/5 to f/7. With smaller sensor 1” and 4/3” cameras, it can work well with refractors slightly outside this range of focal ratio.
With male M48x0.75 threads to interface with the camera, this 2” reducer/flattener delivers an image circle of 44mm, large enough for use with full-frame cameras. An M42 T/T2 threaded version of this item is also sold separately if you need the smaller camera interface.
The flattener’s nosepiece slides into any standard 2” telescope focuser. Note: The nosepiece has a female M48x0.6 thread on the telescope side and will only accept Orion 2” filters - it will NOT accept most other 2” filters on the market which use the more common M48x0.75 threads.
The Long Perng 2” field flattener requires a standard back focus of 55mm from the base of the male M48 thread. This makes it ideal for DSLR cameras with a wide M48 T-ring (sold separately). It also works with most other astronomy cameras when matched with suitable extension rings (sold separately).
The flattener features fully multi-coated optics in an anodized CNC-machined aluminum body with a polished gloss black finish.
| Product Banner Type | new |
|---|---|
| Free Shipping Graphic | Free US Shipping |
| Hide Found a better Shipped Price on Frontend? | No |
- Long Perng 2” field flattener for refractors of focal ratio f/5 to f/7
- Flattens image field for cameras with APS-C or smaller sensors
- Integrated M48 thread for camera attachment (an M42 T/T2 version of this reducer is also available separately)
- CNC machined body with hard, gloss, black anodized finish
- Features 2" nosepiece with safety groove
- Requires 55mm back focus
The Long-Perng 1.0x field flattener # K1.0X-DBU minimizes field curvature caused by the objective lenses of fast refractors and provides a sharper image across the camera sensor.
As a 1.0x flattener, it does not change the effective focal length of the telescope. The optical design of this flattener makes it optimal for use with refractors with a focal ratio of approximately f/5 to f/7. With smaller sensor 1” and 4/3” cameras, it can work well with refractors slightly outside this range of focal ratio.
With male M48x0.75 threads to interface with the camera, this 2” reducer/flattener delivers an image circle of 44mm, large enough for use with full-frame cameras. An M42 T/T2 threaded version of this item is also sold separately if you need the smaller camera interface.
The flattener’s nosepiece slides into any standard 2” telescope focuser. Note: The nosepiece has a female M48x0.6 thread on the telescope side and will only accept Orion 2” filters - it will NOT accept most other 2” filters on the market which use the more common M48x0.75 threads.
The Long Perng 2” field flattener requires a standard back focus of 55mm from the base of the male M48 thread. This makes it ideal for DSLR cameras with a wide M48 T-ring (sold separately). It also works with most other astronomy cameras when matched with suitable extension rings (sold separately).
The flattener features fully multi-coated optics in an anodized CNC-machined aluminum body with a polished gloss black finish.
| Product Banner Type | new |
|---|---|
| Free Shipping Graphic | Free US Shipping |
| Hide Found a better Shipped Price on Frontend? | No |