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blende8
Joined: 29 Sep 2007 Posts: 260 Location: Bremen, Germany
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Posted: Thu Dec 07, 2017 6:17 pm Post subject: Defective lens - what's this? |
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blende8 wrote:
I bought a lens from ebay: Pentax SMC 85/1.8
It looks like new.
But the images I get are sharp only in the center.
What can this be?
_________________ Best wishes, Wieland
K-1, K-5IIs
Pentax, mysterium quod absconditum fuit ... |
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calvin83
Joined: 12 Apr 2009 Posts: 7553 Location: Hong Kong
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Posted: Thu Dec 07, 2017 6:22 pm Post subject: |
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calvin83 wrote:
Reversed element(s)? Check the optical diagram below
https://www.pentaxforums.com/lensreviews/SMC-Pentax-K-85mm-F1.8-Lens.html _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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tb_a
Joined: 26 Jan 2010 Posts: 3678 Location: Austria
Expire: 2019-08-28
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Posted: Thu Dec 07, 2017 8:09 pm Post subject: |
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tb_a wrote:
It's obviously defective. I would send it back if that would happen to me. _________________ Thomas Bernardy
Manual focus lenses mainly from Minolta, Pentax, Voigtlaender, Leitz, Topcon and from Russia (too many to be listed here). |
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Lloydy
Joined: 02 Sep 2009 Posts: 7785 Location: Ironbridge. UK.
Expire: 2022-01-01
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Posted: Thu Dec 07, 2017 10:34 pm Post subject: |
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Lloydy wrote:
that's barely sharp in the middle, there's something wrong with that lens. _________________ LENSES & CAMERAS FOR SALE.....
I have loads of stuff that I have to get rid of, if you see me commenting about something I have got and you want one, ask me.
My Flickr https://www.flickr.com/photos/mudplugga/
My ipernity -
http://www.ipernity.com/home/294337 |
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cooltouch
Joined: 15 Jan 2009 Posts: 9097 Location: Houston, Texas
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Posted: Fri Dec 08, 2017 1:35 am Post subject: |
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cooltouch wrote:
Does it look like it's been apart before? Check for marks on the spanner slots and any screws visible. There should be some traces to indicate if it's been apart before. Obviously it's missing something or something got put back out of place.
But that shouldn't have to be your call. You've received a defective piece of merchandise. Time to send it back. _________________ Michael
My Gear List: http://michaelmcbroom.com/photo/gear.html
My Gallery: http://michaelmcbroom.com/gallery3/index.php/
My Flickr Page: https://www.flickr.com/photos/11308754@N08/albums
My Music: https://soundcloud.com/michaelmcbroom/albums
My Blog: http://michaelmcbroom.com/blogistan/ |
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Lightshow
Joined: 04 Nov 2011 Posts: 3669 Location: Calgary
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Posted: Fri Dec 08, 2017 7:02 am Post subject: |
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Lightshow wrote:
That lens has a serious issue, like the spacing is wrong between the cells or between elements, return it and look for another. _________________ A Manual Focus Junky...
One photographers junk lens is an artists favorite tool.
My lens list
http://www.flickr.com/photos/lightshow-photography/ |
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blende8
Joined: 29 Sep 2007 Posts: 260 Location: Bremen, Germany
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Posted: Fri Dec 08, 2017 7:38 am Post subject: |
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blende8 wrote:
Thanks for your comments.
I cannot see any marks that it has been opened before.
The front barrel feels unfirm though.
I will send it back. _________________ Best wishes, Wieland
K-1, K-5IIs
Pentax, mysterium quod absconditum fuit ... |
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Lightshow
Joined: 04 Nov 2011 Posts: 3669 Location: Calgary
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Posted: Fri Dec 08, 2017 8:34 am Post subject: |
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Lightshow wrote:
It should feel solid.
I still want a K 85/1.8 for my collection, it should be a very sharp lens. _________________ A Manual Focus Junky...
One photographers junk lens is an artists favorite tool.
My lens list
http://www.flickr.com/photos/lightshow-photography/ |
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blotafton
Joined: 08 Aug 2013 Posts: 1552 Location: Sweden
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Posted: Fri Dec 08, 2017 10:10 pm Post subject: |
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blotafton wrote:
Sometimes the spanner marks have been painted over to hide them. But with a good eye it can be spotted. |
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Sciolist
Joined: 29 Mar 2017 Posts: 1445 Location: Scotland
Expire: 2021-04-16
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Posted: Sat Dec 09, 2017 11:46 am Post subject: |
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Sciolist wrote:
The last time I saw that in a viewfinder blende8, I'd put one of the elements the wrong way round in an Olympus 50 1.8. I can't remember which of the elements it was unfortunately. I keep wanting to say the rearmost element, but I'm not honestly sure. |
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Lightshow
Joined: 04 Nov 2011 Posts: 3669 Location: Calgary
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Posted: Sat Dec 09, 2017 12:46 pm Post subject: |
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Lightshow wrote:
The Helios 44 is a good example of that, it's nearly impossible to tell which way it goes. _________________ A Manual Focus Junky...
One photographers junk lens is an artists favorite tool.
My lens list
http://www.flickr.com/photos/lightshow-photography/ |
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