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Field Flatteners - Stellarvue Field Flattener For F/7 Telescopes With 2.5" Focusers - SFF7-25

Stellarvue Field Flattener for f/7 Telescopes with 2.5" Focusers - SFF7-25

  • Vendor
    Stellarvue
    Sale price
    $229.00
    Regular price
    $229.00
    Unit price
    per 

    Availability:

    Dedicated APS sized f-7 field flattener for use with either the Feather Touch 2.5” focuser or the new Stellarvue 2.5” dual speed focuser. This is the flattener for imaging with APS sized and smaller chips when used with any of our telescopes that use the 2.5” focuser. Attach your DSLR to the t-thread on the flattener using a camera t-ring and you are ready to go.

    The Importance of proper spacing: The photographic field flattener must be placed at a precise distance from the camera’s internal ccd sensor. If the spacing is incorrect, the performance will be compromised. Our stock flatteners are made to work with DSLR cameras. The distance from the t-ring to the internal ccd sensor on a DSLR camera is about 55 mm. This distance from the thread on the front of the camera to the sensor is also known as its “backfocus.”

    camerasideview55mm240.jpg

    Non DSLR (ccd astro cameras) are not made to the same specifications. The distance from the thread on the front of the camera to the chip varies and if often much less than 55 mm.

    ccdcamerasideview240.jpg

    If the distance from the camera's chip to the front thread is less than 55 mm, you must purchase threaded extension tube(s) and/or spacer rings in order to maintain a distance of 55 mm from the back of the field flattener to the cameras sensor. This field flattener has a standard M42 X .75 t-thread attachment. Our selection of 42 mm extension tubes may be viewed here.

    There is a better alternative to using standard 42 mm t-thread extensions. We recommend using our 48 mm extensions as they are less likely to cause vignetting. Stellarvue offers a complete 48 mm extension system. We have extension tubes and spacer rings in the 48 mm size.

    sfe-adapters400.jpg

    These extension tubes and/or spacer rings can be placed between the lens and extension on this field flattener as shown:

    sff7-25-3-flattener-spacers2.jpg

    Example: If your CCD camera has a backfocus of 34 mm. This is 21 mm shorter than the required distance from the field flattener to the chip. To compensate for this, unthread the field flattener as shown in the image immediately above. Insert a 20 mm extension tube and a 1 mm spacer ring here. Now your field flattener is optimized for your particular camera! You can find the backfocus of your camera on the manufacturers website. If it is not there, call them. SKU:SFF7-25Width:5.00 (in)Height:5.00 (in)Depth:5.00 (in)Shipping:Calculated at Checkout

    We work very hard to ensure that we offer the absolute best prices online.  If you find another online store that offers a lower price then us within six months of your purchase date please let us know and we will refund your original payment for the difference.  We want you to feel confident that you are getting the absolute best price for the product you are ordering.  If you find that our own website has a lower price for the same item you have ordered within six months of your purchase date will refund the difference as well.

    To request your partial refund simply e-mail us a link to the same product on our website, or on our competitors website within six months from the date of your order and we will process the credit accordingly.

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