SFFX1 Flattener

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Product Description

*Due to an unprecedented number of orders all SFFX-1 and SFFX-2 flatteners are being built as time permits. As such, please allow 1-2 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 3.5" 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.

Check the camera literature to determine the camera's thread size and select this option above so the camera will thread to the flattener. Also make sure the total camera backfocus is 55mm. If not, email us at mail@stellarvue.com and we will help you get what you need.

If any of this is confusing, click here to learn more about photographic field flatteners.

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 fewer 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 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 and spacer rings to make this easy.

Flattener Only: Again, these flatteners are provided with the proper extensions needed to work your particular SVX refractor and a camera system that has a back focus of 55mm.

The list immediately below includes the total spacing needed between the SFFX-1 FLATTENER ONLY 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. If you need to purchase a flattener that will work with a camera that has a different backfocus, contct us at mail@stellarve.com.

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5
First Impressions

Posted by Randall on 25th Dec 2022

The flattener is solidly made. I particularly like that it is not adjustable. Stellarvue has chosen to use extensions to reach the proper backfocus for the imaging train. I would recommend buying the SFA-M63F48-005 ring and filter adapter if you are not going to be using a filter wheel. I realized this and purchased it even before my scope arrived.
The lenses were super clean and it came well packed (over packed?). Attaching this to the scope is easy and adding filters will not cause changes like adjustable flatteners do.
I have been able to use this one night. The stars are perfectly round, even to the corners.
This is a must for astrophotography and I can say that the quality is in line with what I expect from Stellarvue.
5
SFFX1 Performance

Posted by Rob Popovich on 28th Nov 2022

Bought this to optimize my SVX102T-R for astrophotography with the ZWO ASI533MC Pro camera. Using this with manual focus on the 3" FT focuser I see no distortion across the complete field in my images. Very well made and absolute perfect fit.
5
SFFX1

Posted by William Tibbals on 28th Nov 2022

I installed this Flattener on my SV 110 ED and Viola my oblong stars are Gone!!
Thanks to Vic for his great assistance
5
SFFX1 Flattener

Posted by Peter Bresler on 22nd Nov 2022

A flattener is needed on refractors to produce a perfectly flat field of stars. This is designed for the SV scopes. I had on my SV130 and bought a second for my SV80. It works great!
5
A worthy investment

Posted by Oliver on 30th Mar 2022

Works perfectly with my SVX102D. Superb optically and mechanically. Using with full frame Sony mirrorless camera.