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.”
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.
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.
These extension tubes and/or spacer rings can be placed between the lens and extension on this field flattener as shown:
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
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Miscellaneous Shipping Information
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Processing time is the time it takes from when you submit your order to when the product leaves the warehouse. The "Ships Within" time frame listed with each of our products on the website applies to this time frame. For example, if your order a product that reads "Ships Within: 2 Weeks", this means that the product typically leaves the factory within two weeks. If there will be any additional time required to process your order, we will notify you immediately to confirm the delivery period. This time is needed for products that are shipped to you directly from our manufacturers. The manufacturers need this time to fulfill your order. In some cases, the items are custom built. Shipping time is measured when your order leaves the warehouse to when it arrives at your address. Actual shipping time can vary between 2-5 business days. Contact our helpful customer service experts at (888-264-2244) for more information.
Did your shipment arrive damaged or defective?
Please report damaged or defective merchandise to us immediately by email phone. Photos of the items and the packaging would be greatly appreciated. This will speed up our resolution process. We strongly recommend at the time of delivery, if your notice any cartons that look dented, crushed or just not right, open them immediately and inspect the contents. If the contents appear to be damaged, please notate it on the delivery ticket, refuse that item only and contact us as soon as possible for instructions.
Brands/Products that do NOT qualify for our 30 Day Return Policy:
APM products do not qualify for our 30 day return policy.
Additionally, items that are special ordered, customized, or engraved - cannot be returned or refunded under our 30 day return policy.
If your engraved item needs to be repaired within 30 days of purchase, please reach out to us and we will have the product repaired or replaced, re-engrave if necessary, and return it to you in new condition.
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