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What price for used Televid?

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Old Sunday 22nd February 2004, 12:21   #26
Rob Smallwood
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Afetr all this talk of lens cleaning - what do the neurotics do in the field, say when salt water is blown on the scope - do you give up and go home or use an old hanky?
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Old Sunday 22nd February 2004, 12:33   #27
Leif
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Quote:
Originally Posted by Rob Smallwood
Afetr all this talk of lens cleaning - what do the neurotics do in the field, say when salt water is blown on the scope - do you give up and go home or use an old hanky?
I take along a cleaning kit: blower to remove grit, sterile cotton wool, and lens cleaning fluid in a small cigarette packet sized box. It's not rocket science.

I am told that salt water can cause damage to coatings so should be removed ASAP. If I was caught without a cleaning kit and got salt water on the lens, yes I would use a clean tissue, or even an old hanky. Snot is less corrosive than salt.
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Old Sunday 22nd February 2004, 13:52   #28
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....and so beautifully put!!
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Old Sunday 22nd February 2004, 14:02   #29
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Originally Posted by Rob Smallwood
....and so beautifully put!!
One tries to maintain Bird Forum's high standards ...
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Old Sunday 22nd February 2004, 14:16   #30
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Quote:
Originally Posted by Leif
One tries to maintain Bird Forum's high standards ...
Wearing specs, I always keep a clean hankie at the ready in case my lens cloth is not about. A blower-brush is a good idea, Leif - it's very easy to forget the importance of this. Salt water always seems slightly greasy, too, and is tough to remove.
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Old Monday 23rd February 2004, 07:54   #31
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Quote:
Originally Posted by Leif
I am told that salt water can cause damage to coatings so should be removed ASAP. If I was caught without a cleaning kit and got salt water on the lens, yes I would use a clean tissue, or even an old hanky. Snot is less corrosive than salt.
This may have been (excessively) discussed elsewhere, but I find it very hard to understand, why salt would be corrosive to coatings. I do know that acids (eg. acid rain) can dissolve soft coatings, but I think modern harder coatings are so resistant against corrosion that it would probably be better not to clean the lenses before coming home. To remove salt crystals from lenses it is important to use a solution containing enough water (at least 30%) - salt dissolves in water, not ethanol/isopropanol/methanol. Some cleaning fluids are pure solvents (95-100%), so beware. Strong alcohol solutions are good for the final treatment to prevent drying spots.

I'd recommend avoiding excessive lens cleaning and do it only indoors in very good and clean conditions, with proper equipment (plenty of disposable stuff available, like Q-tips). It is amazing how dirty the lenses can be before you start to see any effect on image quality.

Ilkka

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Old Monday 23rd February 2004, 10:01   #32
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Originally Posted by deboo
As for cleaning the eyepiece lens' I use a cloth provided by FocusOptics....
I use lots of water and the cloth to clean the objective(s)....As you, I'm becoming paranoid..Am I doing this correctly?!!!
Dave.
Distilled water would be better. Tap water used over a long period might not be the best idea for lenses.
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Old Monday 23rd February 2004, 12:42   #33
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Ilkka: That's a very good point about salt not being soluble in isopropyl alcohol and one I had not thought about. Looks like I need some water - distilled as indicated by Mak. I am not at all sure about the hardness of the outer coatings. (I am not saying you are wrong, just that I am ignorant on this matter.) Leica are the only manufacturer to state explicitly that they apply a hard coat suggesting a degree of scratch resistance. I heard that someone ruined a pair of B&L Elites with repeated cleaning.
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Old Monday 23rd February 2004, 15:20   #34
iporali
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I found this comment on Birdwatchers Digest: http://www.birdwatchersdigest.com/ho...oatings03.html

"One place where quality in lens coatings does manifest itself is durability. Traditionally, even the finest lens coatings were somewhat fragile and easy to abuse by poor cleaning techniques. Top-quality binoculars now feature much harder coatings, making them more resistant to scratching and scuffing. But this new breed of coating is, at present, reserved for the expensive stuff. Cheaper coatings remain quite soft. "

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Old Monday 23rd February 2004, 16:27   #35
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I've been buying lenses for over thirty years and do not think that the coatings are so very different these days, although I could be wrong.

Right back then I think that Pentax were using what they called their SMC coating. I've always cleaned using Leif's technique - blower brush, lens tissue / cloth / cotton buds with water, methanol or ipa as appropriate.

Thankfully, I've never had any problems yet.
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Old Monday 23rd February 2004, 16:37   #36
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Does anyone else use a lens pen as sold by jessops amongst others?It has a brush at one end and a dry silicone? type of felt at the other.I've used one for several years without any damage to coatings.
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Old Monday 23rd February 2004, 16:49   #37
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I've seen a simlar one for cleaning other things from www.7dayshop.com (well worth a look - bargain prices and I've had exceelent service) - but I'm surprised silicones are a good thing to put onto any optical glass as they are very difficult to remove and can be slightly sticky.
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Old Monday 23rd February 2004, 16:57   #38
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It's maybe not silicone,I can't remember the specs' on the packaging,but it seems to work better than a lens cloth.
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Old Monday 23rd February 2004, 21:28   #39
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Thomas i've been using a lens pen for several years,i think they work better on binoculars than scopes,i think the glass on the scope eg. 77 or 80mm to big an area for the lens pen.But works very well on the eyepiece and binoculars. Also get mine from 7dayshop about £3.
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Old Tuesday 24th February 2004, 07:27   #40
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I looked at that one, Graham - but it's sold for cleaning LCDs rather than lenses. I remember thinking, who would pay that much (although not a lot, I know) just to clean an LCD? So it's useful for cleaning bins, eh? I shall have another look.
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Old Tuesday 24th February 2004, 07:28   #41
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Back to this thread - IU see a used Apo Televid (the 62mm with zoom) on eBay for £800! You can buy them new for not much more. eBay's prices are crazy these days for some items.
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Old Tuesday 24th February 2004, 20:20   #42
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Steve its called a lens pen.Iam not sure its the same pen for cleaning the L.C.D. screen. It is a while since i've brought one.Also seen the Leica on Ebay,yes its over priced,notice he's has no bids.
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Old Tuesday 24th February 2004, 22:07   #43
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I hate cleaning the objective lenses , I don't know about you. It's nigh on impossible to get them 110% perfectly clean - and I hate even a tiny smear when I'm in my lens-cleaning mood!
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Old Tuesday 24th February 2004, 22:50   #44
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Quote:
Originally Posted by Leif
Steve: Yes that was exactly my feeling. Who in their right mind spends that sort of money and then loses the proof of purchase. I'm glad to hear that I'm not the only one with doubts. I really think I would rather spend a few hundred more than risk a stolen item, or alternatively one that is perhaps 5 or more years old.
get a note of the serisal number of the televid and also ask to see the leica passport (I think they do it with televids as well as binos). If the passport tallies with the seller and the serial number it should be ok - if either are dodgy then walk. unfortunately the leica warranty/passport does not transfer to second owners....

Taylor Hobson - know them well, been a while since I looked round the facory in Leicester - was still under Rank then... yes they really knew their optics!
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