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bychance
Joined: 24 Apr 2013
Posts: 345
Location: Kent, England
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 Posted: Thu Jan 22, 2015 2:56 am Post subject: Etched glass |
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bychance wrote:
Just stripped down a canon fl 50 1.8 to attend to what looked like internal problems with cloudy/fungus marks, but these are in fact on the outside of both the front and rear elements and I cannot shift them, if anything they look worse now they are cleaned.
Is there any point in trying to resurface the glass, and if so what would you recomend trying.
I even swabbed a small area with brick acid cleaner of all things and even that would not touch the opaque areas.
Is this a write off do you think?
Steve.
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Oldhand
Joined: 01 Apr 2013
Posts: 6009
Location: Mid North Coast NSW - Australia
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| Posted: Thu Jan 22, 2015 3:01 am Post subject: |
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Oldhand wrote:
Sounds like there is little you can do for the poor old lens.
I am thinking that it isn't worth trying to have it re-ground as these FL and FD lenses are likely to be found cheaper than the cost of the treatment.
A write off, I think.
Pity, as they are very good lenses.
OH |
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Mir
Joined: 07 Feb 2011
Posts: 978
Location: Montreal, Canada
Expire: 2017-09-30
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| Posted: Thu Jan 22, 2015 3:48 am Post subject: |
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Mir wrote:
Not sure what these lenses are worth but if you like it and would like to keep it,
get a beat up one real cheap and make a good one from the best salvage parts/glass of the two...
Unless they're not worth the trouble...
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MISC: Tamron SP 35-80 (01A), Auto Chinon Tomioka 1.4/55, Tokina AT-X 2.5/90, Tamron SP 5,6/300 (54B)
ZEISS: WG Distagon 2.8/25, WG Distagon 2.8/35 HFT, WG Planar HFT 1.4/50, Ultron 1.8/50, WG Sonnar 2.8/85, WG Sonnar HFT 2.8/135
VOIGTLÄNDER : Ultron Aspherical 1.8/21, Ultron 2/28, Nokton Aspherical 1.2/35, Nokton Classic 1.4/40, Nokton Aspherical 1.5/50, Color-Heliar 2.5/75
MINOLTA: MD 3.5/35-70 Macro, MD 1.2/50, MC Rokkor-X 1.2/58, MD Macro 3.5/50
LEITZ: SUMMICRON-R 2/35 (II), SUMMICRON-R 2/50 (II), TELE ELMARIT-M 2,8/90 (Thin)
CANON RF: 2.8/28, 2/35, 1.2/50, 1.4/50, Serenar 1.8/50, 2/85, 2/100, 3.5/100
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And a small Minolta AF set: 2.8/20, 1.4/35, 1.4/50, 2/100, 4.5/100-200
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luisalegria
Joined: 07 Mar 2008
Posts: 6627
Location: San Francisco, USA
Expire: 2018-01-18
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| Posted: Thu Jan 22, 2015 3:56 am Post subject: |
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luisalegria wrote:
There's a difference between usability and resale value. A lens can look like it has dreadful problems and thereby have no market value, but these may have only a marginal effect on performance.
Coating damage, scratches, chips and cleaning marks on front elements may have no effect at all, or only under exceptional conditions. I suggest you try it out.
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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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Lightshow
Joined: 04 Nov 2011
Posts: 3669
Location: Calgary
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| Posted: Thu Jan 22, 2015 5:48 am Post subject: |
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Lightshow wrote:
Ebay prices are about $30
This one is almost half that.
http://www.ebay.ca/itm/Canon-FL-50mm-f-1-8-Manual-Focus-Lens-From-Japn-/251774447842
I personally would look for the 50/1.4 which can be found under $100
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bernhardas
Joined: 01 Jan 2013
Posts: 1437
Expire: 2017-05-23
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| Posted: Thu Jan 22, 2015 12:31 pm Post subject: |
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bernhardas wrote:
Edited
Last edited by bernhardas on Sat Apr 02, 2016 7:59 pm; edited 1 time in total |
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DConvert
Joined: 12 Jun 2010
Posts: 902
Location: Essex UK
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| Posted: Thu Jan 22, 2015 3:29 pm Post subject: |
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DConvert wrote:
Any treatment would almost certainly cost many times the value of a similar lens in perfect condition.
As luisalegria suggests give it a try & see what the results are like and if thats no good see if you can get any use out of it with the problem elements removed!
I've seen recomendations to remove the rear group from a kit 50 to give a soft focus portrait lens (worked with one of my spare Pentax M50/1.7 lenses - though it needs to be extended considerably to cope with the new longer focal length) and elsewhere something on removing front elements to give a macro lens...
If you're as mad as me you might even keep the individual elements & aperture mechanism/mount for 'future projects' |
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