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wrep
Joined: 06 Mar 2009 Posts: 9 Location: Stockholm Sweden
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Posted: Fri Mar 06, 2009 10:51 am Post subject: Sigma MINI-WIDE 28mm question |
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wrep wrote:
Hello!
I have just discovered this wonderful world of manual lenses..
My first buy was a CHINON 50mm 1,7 and I really like it!
My secon buy was a SIGMA MINI WIDE 1:2,8 f=28mm MULTI-COATED.
When I recieved it and started to inspect the lenses I discovered that one of the lenses inside has a very coarse/grainy surface it looks like one million small small scratches if you look into it from the back.
Now my question: Should it look like this? Is it some kind of anti-reflex surface or is the lens broken?
Regards // Per W |
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wrep
Joined: 06 Mar 2009 Posts: 9 Location: Stockholm Sweden
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Posted: Fri Mar 06, 2009 11:13 am Post subject: |
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wrep wrote:
I tried to photograph it but it was kind of hard... but anyway this is how it looks. (click the images for full size)
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wrep
Joined: 06 Mar 2009 Posts: 9 Location: Stockholm Sweden
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Posted: Fri Mar 06, 2009 12:10 pm Post subject: |
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wrep wrote:
I found this topic:
http://forum.mflenses.com/thrift-store-sigma-28-2-8-mini-wide-macro-lens-t6422,highlight,sigma+28mm.html
luisalegria wrote: |
I've had one for thirty years, one of the few lenses I've bought deliberately. Unfortunately mine has developed bad haze in its inner elements, and now flares terribly |
It seems that I´ve got the same problem.. is this fixable? I think it´s the coating who have gave up... |
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tango
Joined: 04 Mar 2009 Posts: 16
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Posted: Fri Mar 06, 2009 12:26 pm Post subject: |
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tango wrote:
Possibly you can clean the internal surface of the last rear lens. It seems to me that there it is the problem. |
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wrep
Joined: 06 Mar 2009 Posts: 9 Location: Stockholm Sweden
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Posted: Fri Mar 06, 2009 12:54 pm Post subject: |
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wrep wrote:
I think it´s one of the lenses in the middle the one that is very curved |
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luisalegria
Joined: 07 Mar 2008 Posts: 6602 Location: San Francisco, USA
Expire: 2018-01-18
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Posted: Fri Mar 06, 2009 6:47 pm Post subject: |
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luisalegria wrote:
I'm sorry to hear about your problem. It looks just like what my lens has. One of these days I am going to try to fix it, but I don't have much hope.
I am sure I can disassemble the optics and almost sure I can clean the haze with acetone (the haze is probably from the oil or grease). But I am not confident that I can put it back together.
This is a complex wide angle and the assembly tolerances are very critical. I'm not sure that an amateur like me can reassemble this accurately and still have a decent lens. I disassemble and clean glass all the time for tele lenses, and have had good success, but tolerances for those are not so tight. _________________ I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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CarbonR
Joined: 31 Dec 2008 Posts: 1969 Location: Clermont-Ferrand, France
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Posted: Fri Mar 06, 2009 7:13 pm Post subject: |
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CarbonR wrote:
I received a Sigma Mini Wide 28/2.8 in M42 mount wednesday (with Spotmatic SP, Staks 50/1.4 & 200/4 for 102 EUR), the lens looks like new, but has points one a inner element too. There seem to be aroud the diaphragm, but I tested it wide opened both at infinty and at it's closest distance of focusing, it seems to have no problem, this is rather good for a wide angle wide opened. I had the II version in PKA mount, the results were equivalents, but the inner elements were clear _________________ Cameras : Canon 5D, Pentax K100D, Pentax 6x7, Spotmatic
Lenses : 15mm to 1000mm (24x36)
My websites : [FR & ENG]Takumar - the eyes of the Spotmatic : info about all Takumar lenses // Kogaku - My photo site
I am selling : Takumar lenses and rare Pentax bodies, pm me if you're interested in something [MFLenses feed-back]
Information on Takumar lenses with samples :
Wide angle : Takumar 15/3.5 15mm, Takumar 17/4 17mm, Takumar 18/11 18mm, Takumar 20/4.5 20mm, Takumar 24/3.5 24mm, Takumar 28/3.5 V1 28mm, Takumar 28/3.5 V2 28mm, Takumar 35/2 V1 35mm, Takumar 35/2 V2 35mm, Takumar 35/2.3 35mm, Takumar 35/3.5 35mm, Takumar 35/4 35mm
Standard : Takumar 50/1.4 V1 50mm, Takumar 50/1.4 V2 50mm, Takumar 50/3.5 50mm, Takumar 50/4 50mm, Takumar 55/2 55/1.8 55mm, Takumar 55/2.2 V1 55mm, Takumar 55/2.2 V2 55mm, Takumar 58/2 58mm, Takumar 58/2.4 58mm
Short tele : Takumar 83/1.9 83mm, Takumar 85/1.8 85/1.9 85mm, Takumar 85/1.8 85mm, Takumar 100/2 100mm, Takumar 100/3.5 100mm, Takumar 100/4 100mm, Takumar 105/2.8 V1 105mm, Takumar 105/2.8 V2 105mm, Takumar 120/2.8 120mm
Telephoto : Takumar 135/2.5 V1 135mm, Takumar 135/2.5 V2 135mm, Takumar 135/3.5 V1 135mm, Takumar 135/3.5 V2 135mm, Takumar 150/4 V1 150mm, Takumar 150/4 V2 150mm
Long tele : Takumar 200/3.5 200mm, Takumar 200/4 200mm, Takumar 200/5.6 200mm, Takumar 300/4 V1 300mm, Takumar 300/4 V2 300mm, Takumar 300/4 V3 300mm, Takumar 300/6.3 300mm, Takumar 400/5.6 400mm, Takumar 500/4.5 500mm, Takumar 500/5 500mm, Takumar 1000/8 V1 1000mm, Takumar 1000/8 V2 1000mm
Zoom : Zoom-Takumar 45~125/4 , Zoom-Takumar 70~150/4.5 , Zoom-Takumar 85~210/4.5 , Zoom-Takumar 135~600/6.7
Achromatic : Ultra-Achromatic-Takumar 85/4.5 , Ultra-Achromatic-Takumar 300/5.6 300mm |
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wrep
Joined: 06 Mar 2009 Posts: 9 Location: Stockholm Sweden
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Posted: Fri Mar 06, 2009 10:00 pm Post subject: |
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wrep wrote:
luisalegria wrote: |
This is a complex wide angle and the assembly tolerances are very critical |
Ok.... is it at all possible to get it together? or do you need som kind of special tools or fixtures.. ??
The seller offered me to return it and get my money back... but I only payed about 15dollars or 12 euro... so I´m not going bankrupt if I fail to get it together again...
What do you think should I return it? Or give it a try in the workshop? |
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luisalegria
Joined: 07 Mar 2008 Posts: 6602 Location: San Francisco, USA
Expire: 2018-01-18
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Posted: Fri Mar 06, 2009 11:25 pm Post subject: |
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luisalegria wrote:
If you can return it I suggest you do that, unless you want the adventure in lens repair. That can be fun and very satisfying when you succeed.
This is not a rare or expensive lens and it shouldn't be too hard to find a good one. If this was a Zeiss Flektogon you picked up as a bargain you should of course try the repair, as you would have much to gain. But not in this case.
The equipment I am thinking of are, beyond the usual and unusual hand tools, a collimator appropriate to this lens. And besides that the knowledge and skill to use them to get the spacing and alignment of the lenses right. Usually I just happily push lenses back in to their sockets and screw in the retaining rings without a care, but I don't think that will work well in this case. _________________ I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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CarbonR
Joined: 31 Dec 2008 Posts: 1969 Location: Clermont-Ferrand, France
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Posted: Sat Mar 07, 2009 11:05 am Post subject: |
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CarbonR wrote:
Did you test it, before thinking of throwing it away ?
Mine has points like yours, but is rather sharp wide opened so I don't worry about it _________________ Cameras : Canon 5D, Pentax K100D, Pentax 6x7, Spotmatic
Lenses : 15mm to 1000mm (24x36)
My websites : [FR & ENG]Takumar - the eyes of the Spotmatic : info about all Takumar lenses // Kogaku - My photo site
I am selling : Takumar lenses and rare Pentax bodies, pm me if you're interested in something [MFLenses feed-back]
Information on Takumar lenses with samples :
Wide angle : Takumar 15/3.5 15mm, Takumar 17/4 17mm, Takumar 18/11 18mm, Takumar 20/4.5 20mm, Takumar 24/3.5 24mm, Takumar 28/3.5 V1 28mm, Takumar 28/3.5 V2 28mm, Takumar 35/2 V1 35mm, Takumar 35/2 V2 35mm, Takumar 35/2.3 35mm, Takumar 35/3.5 35mm, Takumar 35/4 35mm
Standard : Takumar 50/1.4 V1 50mm, Takumar 50/1.4 V2 50mm, Takumar 50/3.5 50mm, Takumar 50/4 50mm, Takumar 55/2 55/1.8 55mm, Takumar 55/2.2 V1 55mm, Takumar 55/2.2 V2 55mm, Takumar 58/2 58mm, Takumar 58/2.4 58mm
Short tele : Takumar 83/1.9 83mm, Takumar 85/1.8 85/1.9 85mm, Takumar 85/1.8 85mm, Takumar 100/2 100mm, Takumar 100/3.5 100mm, Takumar 100/4 100mm, Takumar 105/2.8 V1 105mm, Takumar 105/2.8 V2 105mm, Takumar 120/2.8 120mm
Telephoto : Takumar 135/2.5 V1 135mm, Takumar 135/2.5 V2 135mm, Takumar 135/3.5 V1 135mm, Takumar 135/3.5 V2 135mm, Takumar 150/4 V1 150mm, Takumar 150/4 V2 150mm
Long tele : Takumar 200/3.5 200mm, Takumar 200/4 200mm, Takumar 200/5.6 200mm, Takumar 300/4 V1 300mm, Takumar 300/4 V2 300mm, Takumar 300/4 V3 300mm, Takumar 300/6.3 300mm, Takumar 400/5.6 400mm, Takumar 500/4.5 500mm, Takumar 500/5 500mm, Takumar 1000/8 V1 1000mm, Takumar 1000/8 V2 1000mm
Zoom : Zoom-Takumar 45~125/4 , Zoom-Takumar 70~150/4.5 , Zoom-Takumar 85~210/4.5 , Zoom-Takumar 135~600/6.7
Achromatic : Ultra-Achromatic-Takumar 85/4.5 , Ultra-Achromatic-Takumar 300/5.6 300mm |
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wrep
Joined: 06 Mar 2009 Posts: 9 Location: Stockholm Sweden
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Posted: Sat Mar 14, 2009 9:25 pm Post subject: |
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wrep wrote:
Hello again!
Yes I have tried it... the pictures gets like a white milky fog look.. and it can´t handle direct light at all... could maybe be used for some artistic-effect photo
The seller said he would send my money back, but I still haven´t got them.. I´ll give him some more days before he gets a negative feedback..
If he doesn´t pay I´ll use it as a lesson in lens-mechanics maybe I can bulid some kind of adapter from it..
// Per |
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JoeCool
Joined: 08 Jun 2008 Posts: 134 Location: Kassel/Germany
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Posted: Sat Mar 14, 2009 9:56 pm Post subject: |
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JoeCool wrote:
i had one lens, a Yashica ML which had similar little spots on an inner glass surface, when it arrived. Optically it seemed without impact, and after some time it disappeared. Perhaps it was some condensed moisture inside the lens. You could try to put it in the sunshine on the window shelf. _________________ My pics @ flickr: http://flickr.com/photos/21700382@N06/
(miscellaneous) |
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