Fog in Lens

halimj7 · 03-30-2018, 05:12 AM

Bismillah

I have the opportunity to buy an SMC 35mm f3.5 but it has some slight fog around the edges visible in the front element. Should I buy; what are the concerns of a little fog in a lens? Right now it’s not impacting the IQ, but can it spread and end up doing so later? Thanks.

photoptimist · 03-30-2018, 05:50 AM

If the "fog" is element separation, it can certainly grow worse over time but it may take years or decades to grow worse.

I'd be skeptical of claims it does not affect IQ unless you will always use the lens on a APS-C camera and never use it in high-contrast, back-lit situations.

halimj7 · 03-30-2018, 06:25 AM

Bismillah

Thanks for your knowledge. How do I know if it’s element separation?

Ranchu · 03-30-2018, 02:53 PM

There's only a single element on the front 'group' of that lens, so it's not separation. I'd pay maybe XXXXX in the condition you describe. I've had a few, I have three super tak versions now. That seems like a good place to stop buying them,

I made an error here, the price I quoted above would be for the super tak or s-m-c version, if you're talking about the K mount SMC, the price would be higher imo.

Last edited by Ranchu; 03-30-2018 at 10:09 PM.

victormeldrew · 03-30-2018, 03:24 PM

You quite sure it's not a fungal infection??

03-30-2018, 05:12 AM	#1
halimj7 Forum Member Join Date: Oct 2017 Posts: 76	Fog in Lens Bismillah I have the opportunity to buy an SMC 35mm f3.5 but it has some slight fog around the edges visible in the front element. Should I buy; what are the concerns of a little fog in a lens? Right now it’s not impacting the IQ, but can it spread and end up doing so later? Thanks.

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03-30-2018, 05:50 AM	#2
photoptimist Pentaxian Join Date: Jul 2016 Photos: Albums Posts: 5,126	If the "fog" is element separation, it can certainly grow worse over time but it may take years or decades to grow worse. I'd be skeptical of claims it does not affect IQ unless you will always use the lens on a APS-C camera and never use it in high-contrast, back-lit situations.

03-30-2018, 06:25 AM	#3
halimj7 Forum Member Join Date: Oct 2017 Posts: 76 Original Poster	Bismillah Thanks for your knowledge. How do I know if it’s element separation?

03-30-2018, 02:53 PM	#4
Ranchu Senior Member Join Date: Jan 2014 Posts: 151	There's only a single element on the front 'group' of that lens, so it's not separation. I'd pay maybe XXXXX in the condition you describe. I've had a few, I have three super tak versions now. That seems like a good place to stop buying them, I made an error here, the price I quoted above would be for the super tak or s-m-c version, if you're talking about the K mount SMC, the price would be higher imo. Last edited by Ranchu; 03-30-2018 at 10:09 PM.

03-30-2018, 03:24 PM	#5
victormeldrew Veteran Member Join Date: Jun 2015 Location: South West UK Photos: Albums Posts: 1,493	You quite sure it's not a fungal infection??