SKU: 74902511074

Celestron Omni 4mm Eyepiece (1.25")

$2632.50 $2925.00
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Ships within 48 hours · Estimated delivery Jul 27 - Aug 1

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Description

Celestron Omni 4mm Eyepiece (1.25")4mm Focal Length 50 Field of View 1. 25" Diameter Barrel Fully Multi Coated Optics Anodized Aluminum Housing Fold Down Eyecup Celestron 's Omni 4mm Eyepiece is designed for comfortable near and deep space astronomical observation. It is engineered with a 4 element lens configuration, blackened edges, and anti reflective fully multi coated optical surfaces to ensure bright and clear high contrast images with true color transmission across the entire 50

  • 4mm Focal Length
  • 50° Field of View
  • 1.25" Diameter Barrel
  • Fully Multi-Coated Optics
  • Anodized Aluminum Housing
  • Fold-Down Eyecup

Celestron 's Omni 4mm Eyepiece is designed for comfortable near and deep-space astronomical observation. It is engineered with a 4-element lens configuration, blackened edges, and anti-reflective fully multi-coated optical surfaces to ensure bright and clear high-contrast images with true color transmission across the entire 50° field of view. With a 1.25" diameter barrel, it will fit the most common size drawtubes, visual backs, and accessories. The housing is made of a lightweight and durable aluminum alloy with a reflection-limiting matte anodized finish, and a fold-down eyecup make this eyepiece ideal for comfortable viewing for extended periods with or without eyewear.

UPC: 050234933162
Focal Length 4 mm
Barrel Diameter 1.25"
Eye Relief 6 mm
Field Stop Diameter Not specified by manufacturer
Apparent Field of View 50°
Dimensions Not specified by manufacturer
Weight Not specified by manufacturer
Packaging Info
Package Weight 0.2 lb
Box Dimensions (LxWxH) 3.0 x 1.6 x 1.5"
In the Box
Celestron Omni 4mm Eyepiece (1.25")
  • Limited 2-Year Warranty
All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 74902511074

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4.8 ★★★★★
Based on 13 reviews
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G
Verified Purchase
grog
Carnegie, US
★★★★★ 5
If pump doesn't seem to work
Size: For 85-300 HP, Size: For 85-300 HP
Hi....I apologize it took me a while to get back to you with my results. Here is what I discovered about the pump and will also apply to some of the other comments I read in the reviews with people not getting the pump to work: 1.) I removed the pump to check the proper direction of the impeller and it was correct as can be seen in the photo. 2.) I built a pump shaft attachement so that I could operate the pump with a power drill. 3.) I attached the water muff to the unit and tried to pump water.....it wouldn't do so. What I did see however was that even at high hose discharge and small leakage at the muff I could not fill the water cavity in the housing. 4.) I installed a strap around the muff and tightened it very tight and THEN at high hose pressure I was able to get the cavity to fill with water. 5.) At that point I activated the drill and was able to get the pump to actually pump water. I then removed the pump housing and removed the O-Ring that resides on top of the impeller, reassembled and it would not pump water. Since the O-Ring sits higher than the original does I wanted to make sure that it was necessary to have it in the pump. 6.) I reassembled the engine and kept the tight strap on the bottom and finally it pumped water into the engine. My conclusion that you can reply to other buyers if they have a problem: Do NOT underestimate 2 things....1.)the lack of ability of the pump to draw water up AND 2.)the fact that if the muff leaks it will NOT fill the cavity when common sense says it should. This was a 120hp Johnson. The engine bottom must be immersed fully or the muff must be very tight on the lower unit for the pump to function. Please feel free to post this if you wish.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 12, 2024
M
Verified Purchase
Monchita
Chelsea, US
★★★★★ 5
Exelente
Size: For 85-300 HP
Exelente
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 21, 2026
D
Verified Purchase
Dave Murray
New York, US
★★★★★ 5
Good as new
Size: Package Dimensions ‎6.02 x 4.02 x 2.05 inches
Fitment was great and works as it should. Good quality
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 19, 2025
K
Verified Purchase
Kenny
Los Angeles, US
★★★★★ 3
Incorrect motor listed. Far smaller impeller than what's in the 6 horse johnson.
Size: For 5.5HP 6HP 7.5HP
It seems to be of good quality. However it does not fit a 6 horse johnson as it states. Therefore it will not pump water or function for my purposes. It was a waste of money.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 15, 2025
S
Verified Purchase
Sylvia E.
Louisville, US
★★★★★ 5
OE Quality Part
Worked perfectly. Everything needed is there.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 27, 2026

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