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03-15-2013, 12:30 PM   #1
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sigma 600 mm f8???

have a chance to get a sigma 600 mm f8 lens for my k 30 for $95. If the lens is in good shape is that a good deal? Is it a good lens in general, has a greenish colored barrel, def not new

03-15-2013, 12:32 PM   #2
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Is it the 600/8 mirror lens? I have that one and it's only average IMO ... J
03-15-2013, 12:34 PM   #3
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yeah, it's the mirror lens. thanks for your input...
03-15-2013, 12:35 PM   #4
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Sigma 600mm F8 Mirror Lens Reviews - Sigma Lenses - Pentax Lens Review Database

This is a mirror lens and you should fully understand the implications of that before buying it. The closest focal length equivalent is perhaps the new Pentax DA 560mm which sells for about $7,000. You have decide for yourself if a $95 lens is going to give you the image quality you want.

I had a 500mm mirror for awhile and sold it on as I never got an image from it I liked. YMMV

03-15-2013, 12:59 PM   #5
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I had one in my old Canon film days and could get a few good shots out of it. Probably one of the better mirrors, and for $95 I would get it if it is in good shape (with 4 rear filters).
03-15-2013, 01:29 PM   #6
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I haven't used a mirror lens myself but once you figure out the quirks with a mirror lens it seems to be able to perform well in relative to what you pay for it.
I searched flickr for the lens and people get quite decent shots from it with practice and by avoiding busy backgrounds/foregrounds. Two major bonuses to having the K-30 are that you gut the shake-reduction making it possible to handhold and the good ISO performance helps with the slowness of the lens.

A nice moon shot: The Moon 14/03/11 | Flickr - Photo Sharing!

That's darn good for that cost.
03-15-2013, 02:53 PM   #7
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Points to consider on mirror lens

I have used various focal length Catadioptric (mirror) lenses from different manufacturers on 35mm, 6X6, dSLRs and I love them all. They are the cheapest and lightest way to get anything over 300mm, and the IQs are acceptable - for their price. However, there are few things you should consider:

The Depth of Field cannot be changed, i.e. it cannot be manipulate by f-stop.
They are used mainly on sunny day because it is hard to manually focus with a dim dSLR viewfinder. I find using bright (amplified) Electronic Viewfinder on camera such as NEX 7 to focus these lenses is a great help.
A solid tripod with gimbal head is essential. You can capture sharp people images with shutter down to 1/125 sec from a 1000mm lens on a solid tripod & gimbal head. It is hard for me to get any sharp image at shutter speed slower than 1/250 sec even on a 250mm lens when hand held.

Hope these information help.
03-15-2013, 08:24 PM   #8
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I picked up a 600mm F8 Sigma lens and it was aweful!. Close check showed the secondary mirror was degraded. Seller was honourable and took it back. My Tamron adaptall (350mm f5.6) and Russian 3M-5A (500mm F8) mirror lenses are great. Sharp and well built.I hand hold and no problems although a support is obviously better.


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