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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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 Posted: Fri Jul 18, 2008 9:42 pm Post subject: What is impact picture quality if a lens damaged what is not |
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Attila wrote:
I would like to see here shared knowledge base from damaged lenses.
In my experience one or two deep scratch on front lens not impact picture quality at all if you not use lens in infinity distance, they are perfect in close-up and portrait distance.
Only one scratch on super-wide angle lenses can make it flare as Orio said to me.
On rare lens scratches impact picture quality above F11-F16 only.
Lot of scratches what is reduce the light path like haze or mold impact picture quality lens will be soft or/and contrast less.
Some fungus spot also not impact at all and if you store right it will not grow any more.
Broken glass if braked at edge also not impact quality on crop cameras.
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Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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zewrak
Joined: 12 Apr 2008
Posts: 1212
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| Posted: Sat Jul 19, 2008 7:51 am Post subject: Re: What is impact picture quality if a lens damaged what is |
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zewrak wrote:
I hear that if you a scratch gives flare, fill it with black colour and it fix it. Never tried myself though
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Orio
Joined: 24 Feb 2007
Posts: 29545
Location: West Emilia
Expire: 2012-12-04
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| Posted: Sat Jul 19, 2008 8:09 am Post subject: |
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Orio wrote:
In theory all scratches diminish the optical performance, in practice this might become more or less perceivable by human eye. Two important factors are the proximity to the film/sensor plane, and the focal lenght of the lens.
The nearer a scratch to the film/sensor plane, the more focused it will be. This is why a scratch on the rear lens is often worse than a scratch on the front lens when it comes to actually "see it" in the image.
However, I was sold by a Sicilian once, a Distagon 18mm lens advertised as perfect, with a big (I mean BIG) scratch exactly in the centre of the front lens. Not only it was visible as flare at all apertures (even wide open), when stopped down, it was visible also as a shape.
Of course in that case the short focal lenght of the lens made the problem worse than it could be on a tele lens. A super wide angle reaches a virtually infinite depth of field quite easily. So all optical problems on the surface of the glass can easily be spotted.
As a general statement I think it can be said that on tele lenses scratches have less of an impact than on super wide angles. However, under certain conditions, like shooting against the sun, and stopped down, even scratched on tele lenses can cause visibile problems.
Of course, they most certainly impact performance also at wide open, but the other factors (long focal lenght and distance from film/sensor plane) reduce the consequences to a point that an human eye can hardly tell a difference, except perhaps when comparing two photos at big enlargement (one made with scratched lens the other by intact lens)
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Orio, Administrator
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estudleon
Joined: 15 May 2008
Posts: 3754
Location: Argentina
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| Posted: Sat Jul 19, 2008 2:45 pm Post subject: |
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estudleon wrote:
Forgive my ignorance, but I had, in the later years, some lenses with
scraches, fungus, marks, etc, only in the frontal element. The pics taken
with them haven't any mark till I could see. I saw them with a lupe 30X
(slow diapo film). Now I have a super wide angle with lot of cleaning
marks, not scraches but with marks of fungus, all in the frontal element
only. I use the lñens at F/8, 11 and 16. Beleave me, not sign of them in
the film. I can't explain why or why not it occur, or what the theory say in
this question, I only know that when I see the pics at the 30 X lupe, I
don't distinguish nothing wrong.
Ohh.......visual problems you say? 
_________________
Konica 2,8/100
CZJ: 4/20, 2,4/35, 1,8/50 aus jena, 3,5/135MC, Pentacon 1,8/50
Pentax S-M-C-1,4/50
Helios 44-3
Mamiya 2,8/135
Misc. : jupiter 9
Stuff used:
A) SRL
Alpa 10 D - kern macro Switar 1,9/50 -black, Kilffit apochromat 2/100.
Asahi pentax spotmatic super takumar 1,4/50
Contaflex super B tessar 2,8/50 Pro-tessar 115
Leica R3 electronic summicron 2/50 elmarit 2,8/35
Konica Autoreflex 3 (2 black and chrome one), TC, T4. 2,8/24, 3,5/28 not MC and MC, 1,8/40, 1,4/50, 1,7/50 MC and not MC, 1,8/85, 3,2/135, 3,5/135, 4/200
Minolta XG9 2,8/35, 2/45, 3,5/135
Nikkormat FTn 1,4/50, 2,8/135
Fujica ST 801, 605, 705n. 3,5/19, 1,4/50, 1,8/55, 4/85, 3,5/135.
Praktica MTL 5 and a lot of M42 lenses.
Voigtlander. Bessamatic m, bessamatix de luxe, bessamatic cs, ultramatic and ultramatic cs.
Skoparex 3,5/35, skopagon 2/40, skopar 2,8/50, skopar X 2,8/50, super lanthar (out of catalogue) 2,8/50, dinarex 3,4/90, dinarex 4,8/100, super dinarex 4/135, super dinarex 4/200, zoomar 2,8/36-83, portrait lens 0, 1 and 2. Curtagon 4/28 and 2,8/35
Canon AV1, 1,8/50
Rolleiflex SL35 and SL35 E. 2,8/35 angulon, 2,8/35 distagon, 1,4/55 rolleinar, 1,8/50 planar, 4/135 tessar, 2,8/135 rolleinar, x2 rollei, M42 to rollei adap.
Etc.
RF
Yashica Minister III
Voightlander Vito, vitomatic I, Vito C, etc.
Leica M. M2, M3 (d.s.) and M4. Schenider 3,4/21, 2/35 summaron 2,8/35 (with eyes). Summicron 2/35 (8 elements with eyes), 2/35 chrome, 2/35 black, 1,4/35 pre asph and aspheric - old -, 2/40 summicron, 2,8/50 elmar, 2/50 7 elements, 2/50 DR, 2/50 - minolta version, 1,4/50 summilux 1966 version, 1,4/75 summilux, 2/90 large version, 2/90 reduced version of 1987, 2,8/90 elmarit large version, 4/135 elmar. |
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A G Photography
Joined: 11 May 2008
Posts: 1480
Location: Bologna - Italy
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| Posted: Sat Jul 19, 2008 3:43 pm Post subject: |
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A G Photography wrote:
@estudleon
Orio is right and you can check it by yourself.
I once forgot to clean the back of my Nikkor 18-55 (fantastic lens for the price btw even if it's AF) and while at 55 I couldn't notice any problem at 18 I could see in the viewfinder the dust that was in the back lens.
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Alessandro
My Photography Website
My Blog about Photography and Italian Cuisine
My Photostream on Flickr
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DSLR: Nikon d80, Olympus e410
SLR: Chinon CX, Fujica ST605n, Nikon f601, Pentacon FM, Pentax Spotmatic SPII, Praktica FX, Praktica FX2, Voigtlander VST1, Yashica FX-3, Zeiss Contaflex
RF: Altissa Altix, Zorki Ie, Kiev 4b
Medium Format: Pentacon Six TL, Zeiss Ikonta 520/2, Mockba 4, Voigtlander Bessa I, Agfa Isolette II, Agfa Isola
Large Format: Cambo SC 4x5, Rodenstock Sinaron 150/5.6, Rodenstock Rodagon 150/5.6, Schneider Kreuznach Symmar 180/5.6
Lenses
Nikkors: 28/3.5 AIS, 35/2, 50/1.8, 50/2 H, Micro 55/3.5, Micro 60/2.8, 85/1.8, 135/3.5 AI, 200/4 NAI, 18-55/3.5-5.6, 28-80/3.5-5.6, 55-200/4-5.6
CY: Distagon 28/2.8, Planar 50/1.4, Yashika 50/1.7, Sonnar 135/2.8
CZJ m42-Exakta: Flektogon 20/4, Flektogon 35/2.8, Tessar 40/4.5, Tessar 50/2.8, Pancolar 50/1.8, Pancolar 50/2, Biotar 58/2, Biotar 75/1.5, Tessar 80/2.8, Sonnar 135/3.5, Sonnar 135/4, Triotar 135/4
CZJ P6: Flektogon 50/4, Flektogon 65/2.8, Biometar 80/2.8, Biometar 120/2.8, Sonnar 180/2.8
Meyer-Pentacon: Orestegon 29/2.8, Pentacon 29/2.8, Lydith 30/3.5, Primagon 35/4.5, Helioplan 40/4.5, Domiplan 50/2.8, Primotar 50/3.5, Oreston 50/1.8, Primoplan 58/1.9, Orestor 100/2.8, Trioplan 100/2.8, Helioplan 135/4.5, Orestor 135/2.8, Pentacon 135/2.8, Primotar 135/3.5, Primotar 180/3.5, Telemegor 180/5.5, Orestegor 200/4, Pentacon 200/4, Orestegor 300/4, Telemegor 300/4.5, Telemegor 400/5.5
Schneider-Kreuznach: Curtagon 28/4, Curtagon 35/2.8, Xenon 50/1.9, Xenar 50/2.8, Tele Xenar 135/3.5, Tele Xenar 200/4
Russians: Arsat Zodiak 30/3.5, Mir-I 37/2.8, Volna-9 50/2.8, Industar-50 50/3.5, Industar-61 50/2.8, Helios 44 58/2, Helios 44-2 58/2, Helios 44-M-4 58/2, Volna-3 80/2.8, Helios 40 85/1.5, Jupiter 9 85/2, Jupiter 11 135/4
Others: Chinon-Tomioka 55/1.4, Helios 28/2.8, Isco Iscotar 50/2.8, Konica Hexanon 40/1.8, Ludwig Meritar 50/2.9, Schacht Travegon 35/3.5, Schacht Travenon 135/4.5, Sekor 55/1.8, Sigma MF 28/2.8, S-Takumar, 28/3.5, S-Takumar 50/1.4, S-Takumar 55/1.8, S-Takumar 55/2, Steinheil Quinar 135/2.8, Steinheil Culminar 135/4.5, Vivitar 135/2.8, Voigtlander Ultron 50/1.8, Yashica Yashinon DX 50/1.4, Zuiko MC Auto-W 28/2.8
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Puplet
Joined: 09 Aug 2007
Posts: 410
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| Posted: Sat Jul 19, 2008 5:07 pm Post subject: |
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Puplet wrote:
Atilla, This is my experience too. But, after you have collected many lenses - more than you can use in one day - it's nice to buy only the unscratched ones  |
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Sat Jul 19, 2008 5:10 pm Post subject: |
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Attila wrote:
Yes nice to buy beautiful mint one, but pretty shame to think a lens is garbage is scratched and nobody want to take them.
_________________
-------------------------------
Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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estudleon
Joined: 15 May 2008
Posts: 3754
Location: Argentina
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| Posted: Sat Jul 19, 2008 11:23 pm Post subject: |
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estudleon wrote:
[quote="A G Photography"]@estudleon
Orio is right and you can check it by yourself.
I once forgot to clean the back of my Nikkor 18-55 (fantastic lens for the price btw even if it's AF) and while at 55 I couldn't notice any problem at 18 I could see in the viewfinder the dust that was in the back lens.[/quote]
Wow, my visions problems are really serious. I need lupe of 50 or 60x to
see my diapo 
_________________
Konica 2,8/100
CZJ: 4/20, 2,4/35, 1,8/50 aus jena, 3,5/135MC, Pentacon 1,8/50
Pentax S-M-C-1,4/50
Helios 44-3
Mamiya 2,8/135
Misc. : jupiter 9
Stuff used:
A) SRL
Alpa 10 D - kern macro Switar 1,9/50 -black, Kilffit apochromat 2/100.
Asahi pentax spotmatic super takumar 1,4/50
Contaflex super B tessar 2,8/50 Pro-tessar 115
Leica R3 electronic summicron 2/50 elmarit 2,8/35
Konica Autoreflex 3 (2 black and chrome one), TC, T4. 2,8/24, 3,5/28 not MC and MC, 1,8/40, 1,4/50, 1,7/50 MC and not MC, 1,8/85, 3,2/135, 3,5/135, 4/200
Minolta XG9 2,8/35, 2/45, 3,5/135
Nikkormat FTn 1,4/50, 2,8/135
Fujica ST 801, 605, 705n. 3,5/19, 1,4/50, 1,8/55, 4/85, 3,5/135.
Praktica MTL 5 and a lot of M42 lenses.
Voigtlander. Bessamatic m, bessamatix de luxe, bessamatic cs, ultramatic and ultramatic cs.
Skoparex 3,5/35, skopagon 2/40, skopar 2,8/50, skopar X 2,8/50, super lanthar (out of catalogue) 2,8/50, dinarex 3,4/90, dinarex 4,8/100, super dinarex 4/135, super dinarex 4/200, zoomar 2,8/36-83, portrait lens 0, 1 and 2. Curtagon 4/28 and 2,8/35
Canon AV1, 1,8/50
Rolleiflex SL35 and SL35 E. 2,8/35 angulon, 2,8/35 distagon, 1,4/55 rolleinar, 1,8/50 planar, 4/135 tessar, 2,8/135 rolleinar, x2 rollei, M42 to rollei adap.
Etc.
RF
Yashica Minister III
Voightlander Vito, vitomatic I, Vito C, etc.
Leica M. M2, M3 (d.s.) and M4. Schenider 3,4/21, 2/35 summaron 2,8/35 (with eyes). Summicron 2/35 (8 elements with eyes), 2/35 chrome, 2/35 black, 1,4/35 pre asph and aspheric - old -, 2/40 summicron, 2,8/50 elmar, 2/50 7 elements, 2/50 DR, 2/50 - minolta version, 1,4/50 summilux 1966 version, 1,4/75 summilux, 2/90 large version, 2/90 reduced version of 1987, 2,8/90 elmarit large version, 4/135 elmar. |
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