pentax A 35-70 f4


reso

Link Posted 10/02/2011 - 22:50
i have been offered one for the price of the postage it has some lens separation but are told the body and all the other bits are all OK i have had a quote to fix 40 is the lens worth fixing ? or can it be you ed with out
k5iis sigma 10-20 3,5 hsm sigma 15-30
pentax da 16-45 f4 tamron 17-50 2.8 pentax 17-70 f4 sigma 18-125 hsm sigma af 24 2.8 pentax f 35-70 pentax A 35-105 pentax F 35-105 pentax da 55-300 sigma 70-200 apo ex 2.8
kenko pz af 1.5 tele tamron pz af 2.0 tele and a flash

Dangermouse

Link Posted 11/02/2011 - 00:00
I'd be amazed if someone could fix separation for 40 - from what I understand this problem is caused by the breakdown of the glue used to cement elements together. At the factory the parts will be glued on very precise jigs in clean room conditions, both of which the average repairer will struggle to match. Unless the elements are precision glued to within a fraction of a millimetre the lens will be useless.
Matt

Shooting the Welsh Wilderness with K-m, KX, MX, ME Super and assorted lenses.

Smeggypants

Link Posted 11/02/2011 - 01:37
Regarding the cementing of elements together ... I know bugger all about this so forgive a potential stupidquestion ...

but is the 'cement' transparent and applied across the whole area of the glass or is it just on the edges?
[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283

ManixZero

Link Posted 11/02/2011 - 05:18
I also know nuffin about this myself but found this....

link

It seems that the adhesive is applied to the whole surface.

Cheerz

MZ
K5, K7, Nikon FA.
AF Lenses: DA15mm Ltd, DA21mm Limited, DA35mmAL, DA50mm f1.8, DA18-55mmWR, FA28-70mm f4AL, DA50-200mmWR,Tamron SP70-200mm f2.8, AF70-300mm LD Di, SP10-24mm, SP90mm Macro.
MF Lenses: SMC-A 50mm, Adaptall 24mm(CW-24), 135mm(03B), 35-70mm(17A) 80-210mm(03A), Micro-Nikkor55mm, Soligor I-S 200mm f2.8 AIS

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Algernon

Link Posted 11/02/2011 - 08:44
Just get the lens and try it This is a really top lens and cement separation sometimes doesn't affect the pictures. In the meantime look out for a good one. Not worth paying for a repair that may not work. You should get a good lens for about 35 or less.
Half Man... Half Pentax ... Half Cucumber

Pentax K-1 + K-5 and some other stuff

Algi

Oggy

Link Posted 11/02/2011 - 12:26
I was watching a program about how lenses (not Pentax) were made. On that particular job, the lenses were cemented over their whole area.
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