*Due to an unprecedented number of orders all SFFX-1 and SFFX-2 flatteners are being built as time permits. As such, please allow 3-5 weeks for assembly and testing of each individual unit.
Stellarvue's new universal field flattener is designed for cameras with sensors that are full frame and smaller. These flatteners are made here and designed and fabricated to tight tolerances to minimize spherical issues that are all too common in mass-produced flatteners. This flattener will work with all of our current model telescopes but will require different extensions when you switch from one size telescope to another. So we offer them with options based on the telescope used.
This field flattener will thread directly to Stellarvue 3" focusers using the M68X1 thread.
If using a Stellarvue or Feather Touch 2.5" focuser you will also need this adapter.
If you have the 3" Feather Touch focuser or the Moonlight Nitecrawler, use this flattener with this adapter. If your focuser uses another thread we do have other adapters.
If you need to use a 2" filter with this SFFX-1, you will need to use the SFE-M63F48-005. This will fit inside the camera thread adapter (M48/M54) and allow a filter to sit inside the m69 extensions coming off the back of the SFFX-1.
If you are using this flattener with any of our telescopes simply select the telescope you are using from the option list above. Your flattener will come with the correct extensions installed, ready to use with that telescope and a DSLR that has a 48 mm t-ring. ZWO cameras and many others also come with the industry-standard 55 mm back-focus. So these will also work with this set up. The camera attachment thread we use for these telescope-specific flattener assemblies is M48X.75.
What is Included: When you order this field flattener and select one of the telescope specific options above you will receive the mounted field flattener lens assembly with the necessary extensions attached to it so it will work with your particular telescope. Different focal length telescopes will work with this universal field flattener but the extensions must be a different length for the flattener to give the best performance. For example, if you select the SVX080T telescope from the list above you will receive the flattener lens assembly with two extensions 33 mm and 15 mm in length along with the camera connection adapter. These included extensions will allow you to use this flattener with our SVX080T and a camera that has a total of 55 mm of back focus. Our larger telescopes require less extensions.
What if I have a different camera back focus or my camera does not have an M48 thread? If the back focus on your camera is not 55 mm and/or your camera has another size attachment thread (M42, M54, 2.156-24, 3-24) contact us and we can supply you with this flattener along with the proper extensions and adapter to meet your particular back focus requirement. We have a large inventory of extension tubes, spacer rings and adapters to make this easy.
Flattener Only: You may also purchase the SFFX-1 field flattener without any extensions. The focuser side thread is a male M68X1 and the camera-side thread is a female M69X1 that is 6 mm deep. Any adapter that threads into this side must have a thread under 6 mm long and it must have an inside diameter opening that is at least 60.5 mm in diameter. This is because the female thread is recessed into the housing (see the diagram below).
The list immediately below includes the spacing needed between the SFFX-1 and your camera's sensor, based on which telescope you are using:
80 mm f-6: 106 mm
102 mm f-7: 97.8 mm
130 mm f-7: 93.9 mm
140 mm f-6.8: 93.7 mm
152 mm f-8: 90.5 mm
180 mm f-7: 90.5 mm
Stellarvue produces numerous extension tubes and spacer rings for photographic field flatteners. Our SFE-M69 extension tubes are compatible with this flattener.
We have numerous adapters that thread onto these extensions and convert the thread to another size including 3-24, 2.156-24, M54, M48 and M42.