Founder Optics 48mm Low Profile Wide T-Ring for Canon EOS R / RP Mirrorless Cameras
Ships by Next Business Day
Contiguous US Customers:
All items we sell ship for free within the Contiguous US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.
US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.
International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.
Important note:
- Canon EOS-R mirrorless cameras have an FFD (flange focal distance) of 20mm. To couple these with corrective telescope optics (such as flatteners or correctors) with a 55mm back focus requirement, your "R" T-ring should have an optical path length of 55 - 20 = 35mm.
- However, this adapter has a low profile design with an optical length of only 9.8mm (not 35mm). This allows you to insert additional M48-threaded accessories (such as OAGs or filter wheels/filter drawers) with a total optical path length of up to 25.2mm.
- You may need to insert additional M48x0.75 spacers (not included) in addition to other accessories between the corrective optics and this T-ring to get to 25.2mm so that your camera sensor can be placed at 55mm from the corrective optics' male thread to meet the 55mm back focus requirement.
- For example, to use this with ZWO's popular FD-M42-II filter drawer that has an optical length of 21mm, and ignoring the effect of filter thickness on lengthening the back focus requirement marginally, your imaging traing will be:
Corrective optic > M48 thread spacer (4mm optical length) > ZWO filter drawer (21mm optical length) > this T ring (9.8mm optical length) > Canon "R" camera (20mm FFD) so that 4+21+9.8+20 = 54.8mm (close enough!).
Description:
- Founder Optics low profile T-Ring to convert your Canon mirrorless R/RP camera's EOS-R mount to a 48mm thread for attachment to various astronomy accessories such as prime focus adapters, corrective optics, guiders, etc.
- Fits Canon EOS SLR/DSLR mirrorless cameras with EOS-R lens mounts
- M48 female thread on T-ring has a nominal diameter of 48mm and a thread pitch of 0.75mm
- Not for use with Canon EOS EF/EF-S or EOS-M mount cameras
- Compatible with 48mm T-threaded accessories
- Not for use with the smaller, more common standard 42mm T-threaded adapters and accessories which have a male M42x0.75 thread
- High-precision CNC-machined aluminum and black anodized
- Optical path length: 9.8mm
- Clear aperture: 47.40mm
- Weight: Xg / Xoz
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Hide Found a better Shipped Price on Frontend? | No |
Important note:
- Canon EOS-R mirrorless cameras have an FFD (flange focal distance) of 20mm. To couple these with corrective telescope optics (such as flatteners or correctors) with a 55mm back focus requirement, your "R" T-ring should have an optical path length of 55 - 20 = 35mm.
- However, this adapter has a low profile design with an optical length of only 9.8mm (not 35mm). This allows you to insert additional M48-threaded accessories (such as OAGs or filter wheels/filter drawers) with a total optical path length of up to 25.2mm.
- You may need to insert additional M48x0.75 spacers (not included) in addition to other accessories between the corrective optics and this T-ring to get to 25.2mm so that your camera sensor can be placed at 55mm from the corrective optics' male thread to meet the 55mm back focus requirement.
- For example, to use this with ZWO's popular FD-M42-II filter drawer that has an optical length of 21mm, and ignoring the effect of filter thickness on lengthening the back focus requirement marginally, your imaging traing will be:
Corrective optic > M48 thread spacer (4mm optical length) > ZWO filter drawer (21mm optical length) > this T ring (9.8mm optical length) > Canon "R" camera (20mm FFD) so that 4+21+9.8+20 = 54.8mm (close enough!).
Description:
- Founder Optics low profile T-Ring to convert your Canon mirrorless R/RP camera's EOS-R mount to a 48mm thread for attachment to various astronomy accessories such as prime focus adapters, corrective optics, guiders, etc.
- Fits Canon EOS SLR/DSLR mirrorless cameras with EOS-R lens mounts
- M48 female thread on T-ring has a nominal diameter of 48mm and a thread pitch of 0.75mm
- Not for use with Canon EOS EF/EF-S or EOS-M mount cameras
- Compatible with 48mm T-threaded accessories
- Not for use with the smaller, more common standard 42mm T-threaded adapters and accessories which have a male M42x0.75 thread
- High-precision CNC-machined aluminum and black anodized
- Optical path length: 9.8mm
- Clear aperture: 47.40mm
- Weight: Xg / Xoz
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Hide Found a better Shipped Price on Frontend? | No |
Founder Optics 48mm Low Profile Wide T-Ring for Canon EOS R / RP Mirrorless Cameras # TR-CNEOS-R48