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Dynax 7 - sticky back - any cure ?

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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2016 at 12:16
Originally posted by prognathous prognathous wrote:

Nelit, can you post pictures of the result (with Acetone and with IsoPropyl Alcoho)?

Thanks!


I'll take some shot's of them this evening when I get home from work .
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2016 at 12:33
Incidentally , this topic has come up before , as it is a common and seemingly inevitable fault of the Dynax 7 , and some offerings from Canon and Nikon , as they all seemed to use the same rubber type coating in this period .

Although no definitive answer was given , here's a few threads where it was extensively discussed .

http://www.dyxum.com/dforum/dynax-7-sticky-back_topic117285.html

http://www.dyxum.com/dforum/dynax-7-sticky-back-any-cure_topic88924.html

http://www.dyxum.com/dforum/dynaxmaxxum-7-club_topic50574_post1236019.html#1236019

Worth having a browse through anyway .
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Post Options Post Options   Quote pityacka Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2016 at 13:09
Contacted the ebay seller but he is selling on behalf of a friend, and he does not know how it was cleaned. He says that the grip has been removed, but looking at the photos of the camera, the back of the camera just appears normal.
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2016 at 13:58
Originally posted by pityacka pityacka wrote:

Contacted the ebay seller but he is selling on behalf of a friend, and he does not know how it was cleaned. He says that the grip has been removed, but looking at the photos of the camera, the back of the camera just appears normal.


Sounds strange.
It's just the back that gets sticky , not the grip.


Can you provide a link to the item ?
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Post Options Post Options   Quote pityacka Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2016 at 16:32
neilt3, I would struggle to paste a link to what I have referred. But go to www.ebay.co.uk and in search enter Minolta Dynax 7. You should see the camera I refer to. It is listed at £99-99p You can then click on to the photos of the said camera, and then enlarge the photo. As I said previously, everything looks fine with the subject for sale.
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 16 August 2016 at 16:58
If it's item number 182228920701 , the seller in York , it's hard to tell if it's been cleaned as it seems a bit tarnished in the photo's.
Personally I'd rather buy one that hasn't been cleaned off so I can do it myself .
You know it's history then of what's been used on it .
-------------------------------------------------------------------

EDIT ; after looking at the provided picture an a PC screen rather than my mobile phone it seems to have the same surface on it as the one i cleaned with acetone .

So whatever has been used might have had a negative effect on the plastic .

Unfortunately there is no way of knowing what happened to it if the seller isn't the one that's done this .

As it's for sale at the same sort of price as any other, and not cheap , it would probably be best to avoid it .
Buy one that's not been messed with and make your own mind up on how to clean it .

Edited by neilt3 - 17 August 2016 at 00:20
see my photostream on flickr;
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 17 August 2016 at 00:06
Originally posted by prognathous prognathous wrote:

Nelit, can you post pictures of the result (with Acetone and with IsoPropyl Alcoho)?

Thanks!


O.K , took some shots for you . Quite a poor effort to be fair , getting late here and their taken under artificial light .
Might have been clearer under daylight .

The first two shots are my latest way of cleaning the back with IsoPropyl Alcohol .
The finish is very clean , shiny and pure black .
As all the original coating is removed it is down to the smooth black plastic . Although none of the original "gripiness" is retained of the original coating , between the textured rubber used on the camera body and the raised thumb grip you still have a secure grip in the hand .
It does not feel like the camera could slip from your grip .


Minolta Dynax 7 , Sticky back cleaned with IsoPropyl Alcohol
by Neil , on Flickr


Minolta Dynax 7 , Sticky back cleaned with IsoPropyl Alcohol
by Neil , on Flickr

In contrast , the one I cleaned first with Acetone was a much quicker job as it dissolved the sticky coating much quicker.

BUT what appeared to be a white deposit on the surface of the cleaned plastic back is possibly the result of a chemical reaction with the acetone ( I think ).
I do not know if this has a detrimental effect on the plastic long term , but something to note .



Minolta Dynax 7 , sticky back cleaned with Acetone .
by Neil , on Flickr


Minolta Dynax 7 , sticky back cleaned with Acetone .
by Neil , on Flickr

So overall , I would recommend you do not use Acetone , but spend an extra few minutes and use some IsoPropyl Alcohol instead .

BUT DO SO AT YOUR OWN RISK !

After all , what harm can a bit of alcohol do ?!?

Regards , Neil .

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Post Options Post Options   Quote prognathous Quote  Post ReplyReply Direct Link To This Post Posted: 17 August 2016 at 00:35
Thank you so much! The IsoPropyl Alcohol looks like a reasonable option. Definitely better than a sticky surface. If there are no options to renew the rubber, this is what I'll go for.
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 17 August 2016 at 01:12
No problem .
Having the sticky back made them very unpleasant to use , so much as i rarely used mine .

There is no effective way to replace the rubberized coating , and due to the complex shape of the back it's impractical to try and recover it with either camera leather or vinyl camera "leather" .

Just clean it up and I'm sure you'll be happy , mine's getting a lot more use again .
see my photostream on flickr;
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 17 August 2016 at 09:53
Be careful before using organic solvents like acetone. They may dissolve the plastic or degrade it by extracting the plasticisers and altering the material surface (though maybe that's what you want here!). IPA is usually safe, but there are a variety of aqueous and non-aqueous cleaning solutions available from firms like Farnell and RS components, which come with datasheets you can read before buying.

Personally, I have learned to be most careful with chlorinated or fluorinated hydrocarbons, though some of these are being phased out for ecological reasons.
Miranda F & Sensorex, Sony A7Rii, A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras ...
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Post Options Post Options   Quote pityacka Quote  Post ReplyReply Direct Link To This Post Posted: 17 August 2016 at 11:15
neilt3, Thanks for the photos. Your last photo is almost identical to the condition of my 7. Looks like it will be worthwhile trying the Isop. I had mine out yesterday and the stickiness is a real put off. Yet when you finish handling the camera there is no residue left on your fingers !!
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Post Options Post Options   Quote pityacka Quote  Post ReplyReply Direct Link To This Post Posted: 17 August 2016 at 12:31
Good news, and confirms what neilt3 has posted. I have contacted an independent camera dealer, who I have dealt with on occasions, and he states that Isopropyl Alcohol is the best remedy. He has not used it himself on a Dynax 7, but has been informed that it does work and clears the stickiness. He stated DO NOT USE ACETONE.
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 17 August 2016 at 20:01
Originally posted by pityacka pityacka wrote:

neilt3, Thanks for the photos. Your last photo is almost identical to the condition of my 7. Looks like it will be worthwhile trying the Isop. I had mine out yesterday and the stickiness is a real put off. Yet when you finish handling the camera there is no residue left on your fingers !!


It was hard to photograph the backs as you can't really tell what the finish is now like .
The second camera pictured ( with VC grip) is the one I cleaned with acetone , it's fairly clear to see how the surface has been degraded .

I don't know what the long term effects are , but at least I started using the camera again , it was too unpleasant to use whilst sticky .

The IPA definitely seems the way to go .
The resulting finish is just clean, shiny, black plastic .


see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 17 August 2016 at 20:10
Originally posted by Miranda F Miranda F wrote:

Be careful before using organic solvents like acetone. They may dissolve the plastic or degrade it by extracting the plasticisers and altering the material surface (though maybe that's what you want here!). IPA is usually safe, but there are a variety of aqueous and non-aqueous cleaning solutions available from firms like Farnell and RS components, which come with datasheets you can read before buying.

Personally, I have learned to be most careful with chlorinated or fluorinated hydrocarbons, though some of these are being phased out for ecological reasons.


Acetone is not the stuff to use .
I worked that one out after doing it .

All that you want to do is to remove the "rubber" coating on the black plastic .
Not alter the finish of the plastic film back underneath .

Looking at data sheets wouldn't have helped me , not knowing what the substance is that your trying to remove , and not knowing the name of the substance you want to keep (PVC ?)the information would be lost on me .

Up until sorting my cameras out , the only IPA I knew off was a bottled beer !
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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