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Sigma 500mm F4 XQ Mirror

Reviews Views Date of last review
1 17,354 Sun September 16, 2012
Recommended By Average Price Average User Rating
No recommendations None indicated 2.00
Sigma 500mm F4 XQ Mirror

Sigma 500mm F4 XQ Mirror
Sigma 500mm F4 XQ Mirror
Sigma 500mm F4 XQ Mirror
Sigma 500mm F4 XQ Mirror
Sigma 500mm F4 XQ Mirror
Sigma 500mm F4 XQ Mirror

Sigma's highest-end 500mm mirror lens.
Mount Type: Pentax K

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Veteran Member

Registered: April, 2009
Location: Netherlands
Posts: 349
Lens Review Date: September 16, 2012 I can recommend this lens: No | Price: None indicated | Rating: 2 

Pros: low CA
Cons: everything else
Sharpness: 3    Aberrations: 2    Bokeh: 1    Handling: 1    Value: 1   

Well. mine is not labled XQ, but it is probably an early version of this 'lens'.

First some pictures of the lens.
The front :

It comes with a lenscap, which can be used for stopping down to 5.6 :

View with Pentax MX attached:

View with Pentax MX attached and the 2x extender and required extension (all T-mount), then it becomes 1:8 1000mm:

Closeup of the focus unit, and ring for rotating the t-mount.

Closeup of the way too small plate for the tripod connection:

So, and what about the image quality...
Not good, with extender even terrible.
The only good thing is the low CA, because its a mirror.

And the tripod mount is too small, you get vibrations even when using a serious tripod (Berlebach uni-6).

Later versions got a bigger tripod mount, and not without reason.

Conclusion :
Its not sharp on APS-C.
Its shaky on a tripod.
Its not usable without tripod.
Its a collectors item.

I did try to take an astrophoto with this Sigma which will show how it performs at 1:4/500mm:
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