Baader Fluorit Flatfield Converter FFC 3x - 8x photographic and visual

Baader Fluorite Flatfield Converter 3x to 8x

CaF2 Fluorite Flatfield Converter ... the hottest Barlow we know!

We are pleased to offer you this high quality product: The CaF2 Fluorite Flatfield Converter (FFC)! This interesting accessory was developed by one of the Zeiss APQ designers in collaboration with Baader.

The FFC is nothing more than one of the best projectives ever developed. It is more accurate by a factor of 10 than the best projection eyepieces, and not just on the optical axis, but in a field that illuminates to medium format.

The visual use:
The FFC is the most versatile and highest quality Barlow we know. It offers the possibility to increase the magnification between the factor 3x and 8x without any visible loss of image quality. For example, make your 2" 30mm wide-angle eyepiece with the pleasant look of a 4mm planetary eyepiece without sacrificing field of vision or insight.

The photographic use:
The FFC has a T2 female thread on the telescope side and a T2 male thread on the camera side. These photographically very common threads make the FFC a flexible converter that fits all telephoto lenses with T2 connection. With the adaptations we offer you in the section "recommended accessories", you can connect the FFC to every telescope. Also photographically, the FFC offers a focal length extension between 3x and 8x with full field quality.

What differentiates the FFC from Barlow lenses or from photo converters?
The FFC allows extreme extension factors with the appropriate adapter rings without affecting image quality on the axis or in the field. Where photographic converters or Barlow lenses offer only a limited extension factor, 2x, 3x or 5x, depending on the optical design, the FFC allows for a much broader range of full sharpness, 3x to 8x.

In each area, the FFC is doing better than the best Barlows or converters we know.

The connection dimensions of the FFC:

- Connection dimension on the telescope side or lens side: T2 internal thread
- Connection dimension on the camera side or eyepiece side: T2 external thread

Sun observation and photography:
The FFC must not be exposed to direct concentrated sunlight at the back of a telescope for projection purposes, just as with eyepieces, filters or normal converter lenses: the optics could be damaged. The use behind a lens sun filter or a Herschel prism, however, is harmless. In addition, the FFC must not be exposed to extreme temperature changes.

Baader Fluorit flatfield converter 3x to 8x connection at the telescope connection to the telescope:
The FFC has a T2 internal thread. We offer you to connect to the telescope in the range "recommended accessories" all suitable adapters:

Connection to 1.25" excerpts: article BA 2458105
Connection to 2" extensions: article BA 2408150
Connection to SC connection thread: article TS SC-T2

Connection of eyepieces and cameras:

The FFC has a T2 external thread. We offer all suitable adapters for connecting your accessories in the "recommended accessories" area:

SLR cameras: matching T2 rings
1.25" eyepieces: article TS T2-1-T2
2" eyepieces: article TS T2 - 2"
Connection of accessories with SC connection thread: BA 2408135

How do I achieve the extension factors with the FFC?
The greater the distance from the FFC to the eyepiece or camera, the greater the extension factor. You can achieve the distance extension by using T2 extension rings, but you can achieve the same effect by using zenith prisms or mirrors.

If you have the camera, e.g. attach directly over the T2 ring to the FFC, you have about a 3x extension factor. You have the same factor when the field diaphragm of the eyepiece comes to lie about 55mm behind the FFC.

If you go 40mm further, for example via a 40mm T2 extension sleeve, the extension factor increases to about 4 times. Another 40mm gives about 5 times ... and so on.