William Optics SPL Eyepiece

William Optics SPL Eyepiece

  (3 Reviews)
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About this product

Model:  WOspl-1

These new SPL (Super Planetary Long eye-relief) eyepieces feature edge-blackened, multi-coated optics for bright, high contrast views.

Long 20mm eye-relief for comfortable viewing when wearing eyeglasses. 

William Optics fit and finish throughout: Blackened internal spacers and baffles, black anodised exterior and tapered barrel. Threaded for filters.

Model SPL 3 SPL 6 SPL 12.5
Focal Length 3mm 6mm 12.5mm
Lens Structure (#Elements/#Groups) 7/4 7/4 7/4
Field of View 55° 55° 55°
Eye Relief 20mm 20mm 20mm
Barrel 1.25" 1.25" 1.25"
Parfocal Yes


Weight 200g 150g 150g

Customer reviews

Average Rating (3 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Williams Optics 6mm SPL eyepiece
Tuesday, 25 March 2014  | 

Just received the WO SPL 6mm. I was uising a 5mm eyepiece with my Celestron C100 ED,but it was just over the edge on magnification.
What a revelation the Williams Optics 6mm was this evening. Viewing Jupiter was fantastic.A nice big sharp disc with plenty of detail.I could see one of the moons at the 7 o clock position and what's more could easily see the moons shadow cast on the disc. Great eyepieve with plenty of eye relief and field of view for those who use undriven mounts like me.

Rating (max 5):  
A great little planetary eyepiece
Saturday, 28 May 2011  | 

I bought the 6mm focal length version of the SPL last year for use in my dob for some high power viewing. The eyepiece gives 200x at the focal length of my 'scope, which is spot for the average seeing conditions we have here in the UK.

The fit and finish of the eyepiece is rather nice, it has a smart looking black anodized nosepiece instead of the more common chrome plated ones found on other eyepieces. A large rubber hand grip takes up a big portion of the barrel which can only be good for frozen hands on cold nights in the depths of winter. There is a large rubber eye cup that help to position your eye correctly, this can be folded down if needed for eyeglass wearers.
The eye lens is rather large which makes it much more comfortable to use that say and ortho or plossl at this F/L, eye relief is generous as well so there will be no trouble with having to squint or place their eyeball right up to the glass to see anything!

The images it gives in my f/6 dob are rather pleasing to view. It seems that at mid focal length 'scopes, edge performance is still pretty good with very little distortion of objects towards the edge of the FOV. I couldn't tell you how this would perform in an f/5 or faster 'scope as I have no experience of using this eyepiece in one. Seeing and collimation permitting, the level of detail observed on the planets is plentiful and have many pleasing views of Jupiter with it, even when the atmosphere hasn't exactly been up to it. I have found that it gives slightly warmer tone to the view than with an ortho.

This eyepiece lends itself well to observing double stars at high power and also planetary nebulae, using this with a UHC filter give strong hints of detail on the Cat's Eye and the Eskimo.

The fairly wide 55* AFOV is quite an advantage, especially when using an un-driven dob to observe with. I have found that I would only need to nudge the tube every 20 seconds or so, more than enough time to enjoy the object moving through.

In all I rather like the SPL, a good mid-range eyepiece with a good finish and gives great views. The price isn't too bad either.

Rating (max 5):  
A quality set of Planetary EPs
Tuesday, 17 May 2011  | 

I have owned and used all of these eyepieces and found them all to be of a high standard.

A definite step up in class and performance from more common Plossls and the 3mm in particular is very good on nights where the magnification is supported. Colour is well controlled and the moon is a sight to behold in crystal clear high definition.

Usual William Optics fit and finish and comfortable to use.


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