Long Perng 2” Field Flattener for f/5 - f/7 Refractor Telescopes (with M42 T/T2 Thread)
This item has been discontinued by Agena and we no longer offer this.
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- Long Perng 2” field flattener for refractors of focal ratio f/5 to f/7
- Includes interchangeable M42 and M48 thread adapters for camera interface
- 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-DAU 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 when used with an APS-C sensor. With smaller sensor 1” and 4/3” cameras, it can work well with refractors slightly outside this range of focal ratio.
With standard male M42x0.75 T/T2 threads to interface with the camera, this 2” reducer/flattener provides a clear aperture of 38mm which is suitable for use with cameras with APS-C sensors and smaller.
An M48-threaded version of this item is also sold separately. Or you can buy an optional Long Perng M48x0.75 adapter to convert this M42 version to the M48 version later should you want to have both options. When used in the M48 configuration, this item delivers an image circle of 44mm, large enough for use with full-frame cameras.
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. This makes it ideal for DSLR cameras with a standard M42 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.
Other Information
- Country of Manufacture: Taiwan
The Long-Perng 1.0x field flattener # K1.0X-DAU 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 when used with an APS-C sensor. With smaller sensor 1” and 4/3” cameras, it can work well with refractors slightly outside this range of focal ratio.
With standard male M42x0.75 T/T2 threads to interface with the camera, this 2” reducer/flattener provides a clear aperture of 38mm which is suitable for use with cameras with APS-C sensors and smaller.
An M48-threaded version of this item is also sold separately. Or you can buy an optional Long Perng M48x0.75 adapter to convert this M42 version to the M48 version later should you want to have both options. When used in the M48 configuration, this item delivers an image circle of 44mm, large enough for use with full-frame cameras.
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. This makes it ideal for DSLR cameras with a standard M42 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.
- Long Perng 2” field flattener for refractors of focal ratio f/5 to f/7
- Includes interchangeable M42 and M48 thread adapters for camera interface
- 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-DAU 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 when used with an APS-C sensor. With smaller sensor 1” and 4/3” cameras, it can work well with refractors slightly outside this range of focal ratio.
With standard male M42x0.75 T/T2 threads to interface with the camera, this 2” reducer/flattener provides a clear aperture of 38mm which is suitable for use with cameras with APS-C sensors and smaller.
An M48-threaded version of this item is also sold separately. Or you can buy an optional Long Perng M48x0.75 adapter to convert this M42 version to the M48 version later should you want to have both options. When used in the M48 configuration, this item delivers an image circle of 44mm, large enough for use with full-frame cameras.
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. This makes it ideal for DSLR cameras with a standard M42 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.
Other Information
- Country of Manufacture: Taiwan
| Product Status | discontinued - agena |
|---|---|
| Free Shipping Graphic | Free US Shipping |
| Hide Found a better Shipped Price on Frontend? | No |