William Optics Flattener 6AIII (P-FLAT6AIII) extras opinie

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William Optics Flattener 6AIII (P-FLAT6AIII)
Availability: In stock, can be sent within 24 hours

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230 EUR
price w/o VAT: 187 EUR

William Optics Flattener 6AIII (P-FLAT6AIII)
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The adjustable William Optics Flat 6A III Flattener ensures that the image quality is maintained, both in the center and on the edge of the frame, eliminating the negative influence of the refractor's optical system, as a result of which, as you move away from the center of the frame, the sharpness gradually deteriorates. æ, "flatness", of registered objects.

This product also acts as a reducer, allowing to shorten the focal length by 0.8x. The diameter of the illumination circle is about 44 mm, which makes it possible to successfully use this flattener with cameras and full-frame reflex cameras.

Flattener cooperates with systems (through the appropriate ring M48x0.75)

• M4 / 3
• Sony α
• Nikon
• Pentax
• Canon
• Fuji

Compatible telescopes

• William Optics GT 71
• William Optics GT 81
• William Optics ZenithStar 81
• William Optics ZenithStar 103

Correction distance for SLR / mirrorless cameras

• GT 71: 9.1 mm
• GT 81: 7.1 mm
• Z 81: 5.2 mm
• Z 103: 2.5 mm

Back focus

• GT 71: 64.1 mm
• GT 81: 62.1 mm
• Z 81: 60.2 mm
• Z 103: 57.5 mm

Diameter of full illumination circle

• GT 71: 44.4 mm
• GT 81: 44.4 mm
• Z 81: 44.3 mm
• Z 103: 43.1 mm

Technical parameters

• times: 0.8x
• telescope mount: M63 thread
• camera mount: M48 thread
• possibility of mounting the filter: yes, thread M48

Kit components

• William Optics Flat 6A III flattener


24 months

Important expert note

It should be remembered that this instrument is characterized by a constant focal length value, ie the distance from the lens to the primary focus, eg the matrix of a digital camera. Generally speaking, both the reduction ratio for focal length reducers and its increase in the case of Barlow lenses change with the distance from the main focus, making it easy to choose the desired value.

However, if we deal with flatteners or field correctors, then the focal length value must be strictly defined and it cannot be changed. This means that a sharp image can only be obtained when the user sets the correct focal length, which sometimes requires a precision of 0.1 mm.

Most zoom accessories of this type have the focal length specified by the manufacturer. However, if you cannot find this information in the manual or on the website, make the general assumption that a typical back-focus value in astrophotography is 55 mm. If your camera is not rated to this value, or you use modified equipment, look for the products listed below that will solve your problem:

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