The four element Plossl design is perhaps the most popular telescope eyepiece design on today's market and an all-around performer. The TPO Plossl provides excellent image quality, good eye relief and an apparent field of view of about 46 degrees. This well manufactured Plossl will deliver high contrast and pinpoint sharpness out to the edge of the field of view.
Third Planet Optics 4mm Plossl Eyepiece - 1.25"
These Plossl eyepieces are a great value for the amateur astronomer. We get them directly from the manufacturer to save you money. Each 4-element eyepiece is fully multi-coated for maximum contrast and has blackened lens edges to minimize internal reflections and the barrels are threaded to accept 1.25" filters.
The TPO 4mm Plossl Eyepiece is a great extended field eyepiece for longer focal length – good for large nebula and open clusters. For shorter focal length, they are fantastic for large objects such as the Orion nebula, views of the full lunar disc, large open clusters and more. This multi-purpose magnification range also makes for good "locator" eyepieces in all focal lengths. They are also well suited to shorter focal length telescopes for extended views and large, starry fields.
TPO Product Number: OS-P4
- Additional Information
SKU OS-P40 Manufacturer TPO Optical Design Plossl Barrel Size 1.25" Warranty 90 Day - Covered by OPT Eyepiece Field of View - Apparent 46º Eyepiece Focal Length 40mm Eyepiece Eye Relief 31mm Eyepiece Manufacturer Series OPT Plossl Eyepiece Weight Not supplied by manufacturer Field Stop Not supplied by manufacturer Number of Lens Elements & Groups 4 elements Special Feature None Comes with Dust Caps? Yes Comes with Eye Guard? Yes
- Included Items
- TPO 40mm Plossl 1.25" Eyepiece
- Questions & Answers
Product QuestionsLooking for an EP for looking at Galaxies with a 10" reflector. I believe this EP will work good. Was wondering if this product is Used or New and if New is it "flawed". Looks like a nice piece though.Question by: Kris on Aug 28, 2014 11:02:43 AM40mm is a very low magnification for viewing galaxies through a Newtonian/Dobsonian reflector, though it would work well with a larger Cassegrain design. If your telescope is around f/4 to f/6, a 10-20mm eyepiece would likely be a better choice for viewing galaxies. The 40mm eyepiece would be for very faint, large nebulae and would actually lose some light if used on a scope faster than about f/6 due to exit pupil limitations.
This is a brand new eyepiece with no flaws except that as a long focal length Plossl it is better designed for slower focal ratio telescopes.Answer by: Chris (Admin) on Sep 1, 2014 11:22:11 AM
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