Specs:

Focal length: 400mm	Weight: 870g
Aperture: f/5.6 to f/22 8 bladed aperure	Mount: Pentax K (PK) But can also be found with other mounts.
Closest Focus: 6m (20ft)	Covers: Standard 35mm film size (24×36 mm negative)

Built-in extendeable hood
Built-in trypod mount which can be turned 360°


Image quality


Build quality

Very well made and solid.


Conclusion

Not the most impressive lens I have tested exactly.
Mostly because the image quality is not very good.
Wide open look terrible with tons of glow and color fringing.
Stop it down an it okay but not great.

The nice things are however that it's a quite the small and lightweight lens for this focal length.
Focusing only moves a smaller lens elements inside which is nice because focusing is quite easy and smooth.
Compared to moving all elements which is often quite heavy on a lens like this.

Last point is also that this lens seems to be somewhat known to be quite bad.
That is at least good for the price and you can find this very cheap with some luck.
So that is always great for those that just want to give the focal length a try or can't afford to spend that much money.


Thumbs up:
Lightweight and size
8 bladed aperure
Bokeh
Often very cheap

Thumbs down:
Image quality
Glow and color fringing

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Technical Info

Canon 500D with lens mount adapter
Auto White Balance and ISO 100