What have Nikon, Sony and M/S got to do with this forum?

Non Pentax discussions aren't supposed to be allowed.

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That looks good and on the K20D no sign of purple/green fringing (CA). I was trying the lens on my K-5 yesterday and it does suffer from CA on that body. Zoner has a CA correction tool which lets you select purple/green fringing with a dropper and remove it. It also lets you mask the area to change so that you don't change any other greens etc.

This is a crop of the corrected Wainright bottle which suffered from CA (at f/8 ). I took the same shot with the Pentax FA 50mm f/2.8 Macro and couldn't tell the difference apart from no CA.



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A lot of sellers on ebay do try it on and it's not just on photographic gear. Some amazing prices are being asked for things like hard drives.

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Are you sure the aperture is snappy? A sticky aperture is a common fault with this lens.

Price wise I would think £50 would be the limit for a perfect example.

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If Pentax want to do a straight swap..... My Sigma 150-500mm for their lens I'll gladly buy a K-1 Problem solved


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I'm more concerned about what damage the crow-bar effect of the lens pushing against the mag body will have especially if the lens gets knocked. It certainly won't restrict any damage just to the lens mount.

I'm glad I'm not buying a K-1 I could be tempted if they discount them to about £500 I'd risk my Sigma 150-500mm on that

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If you had say 3 lenses that were effected would you buy a K-1?
They aren't Sigma's lenses..... they are YOUR lenses.

If you can only buy mail order would you buy and hope the lenses fit?

Would you be happy scratching your spanking new body?

Best possible case for Pentax would be that Sigma owners would say.... "I'll hold off until I see what Pentax do..... Maybe they will bring out a K-2...... Maybe they will sell off old stocks of the K-1 at 50% discount to Sigma owners"

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Unlike Pentax who are now losing K-1 sales and doing nothing

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You probably need something with much finer detailing. Postage stamps or beer bottles with artwork on them. Lettering is a poor test of any lens.

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Couldn't you stick the tape on the lens instead?

Possibly worth rubbing a small amount of Mr Sheen on the other component using a cloth. The silicone polish should reduce any friction. Don't spread it too far though and polish it off almost completely.

It works great on curtain rails

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