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Diagonals

19 Items
William Optics 1.25" Dielectric Diagonal with Carbon Fiber Side Plates

William Optics 1.25" Dielectric Diagonal W/ Carbon Fiber Plates - D-125D-C-DB

SKU: WYO-D-125D-C-DB
  • Diagonal Type: Mirror Diagonal
  • Diagonal Size - Eyepiece Side: 1.25" Barrel
  • Diagonal Size - Telescope Side: 1.25" Barrel
  • Optics Type and/or Coatings: Dielectric Coatings
$95.00
William Optics 45º Erect Prism - 1.25"

William Optics 1.25" 45° Erect Prism - D-EP125

SKU: WYO-D-EP125
  • Diagonal Type: Correct/Erect Image
  • Diagonal Size - Eyepiece Side: 1.25" Barrel
  • Diagonal Size - Telescope Side: 1.25" Barrel
$80.00

William Optics Dura Bright 2" Carbon Dielectric Diagonal - D-DIG2D-C-DB-T

SKU: WYO-D-DIG2D-C-DB-T
  • Diagonal Type: Mirror Diagonal
  • Diagonal Size - Eyepiece Side: 2" Barrel
  • Diagonal Size - Telescope Side: 2" Barrel
  • Includes Eyepiece Adapter: Yes, 2" to 1.25"
  • Optics Type and/or Coatings: Dielectric Coatings
$139.00
$45.00

William Optics 1.25" RotoLock Adapter - Gold - F-ROTO-A2-125GDII

SKU: WYO-F-ROTO-A2-125GDII
  • This Rotolock adapter locks into the 2” opening of a WO Rotolock diagonal or focuser.
  • This is a steppingstone to attaching 1.25” barreled accessories.
  • Rotating the adapter ring will lock and unlock the inserted accessory into place.
  • Using this adapter will ensure that your accessory is centered.
$45.00
William Optics 2" Dura Bright Dielectric SCT Diagonal

William Optics 2" Dura Bright Dielectric SCT Diagonal - D-DIG2D-C-DB-SCT

SKU: WYO-D-DIG2D-C-DB-SCT
  • Diagonal Type: Mirror Diagonal
  • Diagonal Size - Eyepiece Side: 2" Barrel
  • Diagonal Size - Telescope Side: SCT Threads
  • Includes Eyepiece Adapter: Yes, 2" to 1.25"
  • Optics Type and/or Coatings: DuraBright Coatings
$158.00

William Optics Nosepiece for 2" Diagonal - WD-DIG2A

SKU: WYO-WD-DIG2A
  • This nosepiece converts a standard 2" SCT into a "push in" 2" diagonal.

  • To use this tool, replace the SCT adapter with the nosepiece.

  • Please note that this WO nosepiece will not work with 1.25" diagonals or 2" diagonals that have a built-in SCT mounting ring.

  • This is a great way to change your SCT diagonal to a "refractor type" diagonal.
$30.00
William Optics 1.25" Dura Bright Digaonal for Star71 Refractor

William Optics 1.25" Dura-Bright Diagonal for Star71 Telescope - D-125D-WO71

SKU: WYO-D-125D-WO71
  • Diagonal Type: Mirror Diagonal
  • Diagonal Size - Eyepiece Side: 1.25" Barrel
  • Diagonal Size - Telescope Side: M65x1 Male Thread
  • Optics Type and/or Coatings: DuraBright Coatings
$135.00
William Optics 2" Dura Bright RotoLock Diagonal

William Optics 2" Durabright RotoLock Diagonal - D-DIG2D-ROTO-A2

SKU: WYO-D-DIG2D-ROTO-A2
  • Diagonal Type: Mirror Diagonal
  • Diagonal Size - Eyepiece Side: 2" Barrel
  • Diagonal Size - Telescope Side: 2" Barrel
  • Includes Eyepiece Adapter: No, 1.25" Eyepiece Adapter Sold Separately
  • Optics Type and/or Coatings: DuraBright Coatings
$198.00
William Optics 2" to 1.25" RotoLock Adapter

William Optics 2" to 1.25" RotoLock Adapter - Gold - F-ROTO-A2-125GD

SKU: WYO-F-ROTO-A2-125GD
  • This Rotolock adapter locks into the 2” opening of a WO Rotolock diagonal or focuser.
  • This is a steppingstone to attaching 1.25” barreled accessories.
  • Rotating the adapter ring will lock and unlock the inserted accessory into place.
  • Using this adapter will ensure that your accessory is centered.
$45.00
William Optics RotoLock Eyepiece Adapter & Visual Back for 2 WO Diagonals

William Optics RotoLock Upgrade for WO 2" Diagonals - D-ROTO-A2

SKU: WYO-D-ROTO-A2
  • This Rotolock upgrade uses a flange to connect to WO 2" Diagonals.

  • Rotating the ring with lock and unlock the accessories in place.

  • No thumbscrews are used, so users do not have to worry about marring.

  • William Optics' Rotolock upgrade comes with a plastic protective dust cover.
$89.00
William Optics 2" RotoLock Eyepiece Adapter & Visual Back with 48 mm Male Threads

William Optics 2" RotoLock Eyepiece Adapter / Visual Back with 48mm Male Threads - D-ROTO-A2-M48M

SKU: WYO-D-ROTO-A2-M48M
  • This eyepiece adapter is compatible with telescopes and accessories with female 48 mm threads.

  • The other side of the adapter has a standard 2" visual back.

  • Slightly turning the adapter clockwise will lock accessories in place.

  • William Optics' Rotolock Eyepiece adapter's length is 55.5 mm with a 75 mm outer diameter.
$99.00 $89.95
William Optics 2" RotoLock Eyepiece Adapter & Visual Back with 3.28" Female Adapter

William Optics RotoLock Eyepiece Adapter / Visual Back with SCT 3.28" Threads - D-ROTO-A2-SCT328F

SKU: WYO-D-ROTO-A2-SCT328F
  • This WO Rotolock Eyepiece Adapter mounts to the 3.28" SCT male threads on most SCTs.
  • Using this adapter will replace the original visual back with one that will accept a WO Rotolock.
  • William Optics has designed the adapter to have threads for 48 mm filters.
  • All you have to do is rotate the adapter ring clockwise to lock in the inserted accessory.
$99.00
William Optics SCT Adapter for Standard 2" Diagonal Gold

William Optics SCT Adapter for Standard 2" Diagonal - Gold - D-SCT-TA

SKU: WYO-D-SCT-TA-G
  • This adapter coverts the 2" push-in diagonal into an SCT diagonal.

  • All you have to do is replace the push-in nosepiece with this adapter.

  • WO has designed the adapter to have standard SCT female thread (2" & 24 TPI).

  • This SCT Adapter is anodized gold.
$39.00
William Optics SCT RotoLock Adapter & Visual Back - 1.25"

William Optics 1.25" SCT RotoLock Adapter & Visual Back - F-ROTO-A2-125-SCT-TA

SKU: WYO-F-ROTO-A2-125-SCT-TA
  • One side of this adapter has an SCT thread and the other has a standard 1.25" Rotolock visual back.

  • Simply rotating the adapter will unlock and lock the inserted accessory into place.

  • The design of the adapter will firmly hold and center the accessory.

  • William Optics has utilized internal ball bearings and detents in this design.
$79.00
William Optics Blue 2" to 1.25" RotoLock Adapter

William Optics 2" to 1.25" RotoLock Adapter - Blue - F-ROTO-A2-125BU

SKU: WYO-F-ROTO-A2-125BU
  • This adapter connects to a 2" diameter opening to allow for the use of 1.25" accessories.

  • William Optics designed this adapter to work with WO RotoLock diagonal or focuser.

  • Rotating the adapter ring will lock and unlock the inserted accessories into place.

  • The design ensures a tight grip and optimum centering.

  • This adapter is anodized blue.
$45.00
William Optics 2" to 1.25" RotoLock Adapter - Red Version

William Optics 2" to 1.25" RotoLock Adapter - Red - F-ROTO-A2-125RD

SKU: WYO-F-ROTO-A2-125RD
  • This adapter connects to a 2" diameter opening to allow for the use of 1.25" accessories.

  • William Optics designed this adapter to work with WO RotoLock diagonal or focuser.

  • Rotating the adapter ring will lock and unlock the inserted accessories into place.

  • The design ensures a tight grip and optimum centering.

  • This adapter is anodized red.
$45.00

William Optics 1.25” 90° Erect Prism Diagonal - D-EP90-125-II

SKU: WYO-D-EP90-125-II
  • Diagonal Type: Correct/Erect Image
  • Diagonal Size - Eyepiece Side: 1.25" Barrel
  • Diagonal Size - Telescope Side: 1.25" Barrel
$83.00

William Optics 1.25" 90° RedCat & WhiteCat Erecting Prism - Silver - D-EP90-125-RC51-SL

SKU: WYO-D-EP90-125-RC51-SL
  • Diagonal Type: Correct/Erect Image
  • Diagonal Size - Eyepiece Side: 1.25" Barrel
  • Diagonal Size - Telescope Side: 1.25" Barrel
$118.00