Remove coating or leave haze?

[f16sunshine]

I have a Sonnar 50 in for repair with a haze issue in the rear group. The tech is concerned that the coating will come off while trying to remove the haze. I tend to agree with him. It looked really stuborn and that is why I sent it in. So my question to you is. Should I leave the haze or remove the coating on that face? What cam I expect in either regard?
As always many thanks in advance for your advice.
Btw Tokyo kogaku hc 2/50 is our lens here.

 

[ferider]

Clean the haze, use a hood.

If the coating goes (might not, they are pretty hard) it will be only on one surface, shouldn't impact the performance too much.

Roland.

 

[payasam]

Roland is right. Haze is the presence of something undesirable, not the absence of something desirable.

 

[ZeissFan]

The coatings on Zeiss lenses generally was much sturdier than on Leica lenses.

It should clean up easily.

Haze will reduce light transmission far more than removal of lens coating.

 

[kermaier]

Clean the haze, use a hood.

If the coating goes (might not, they are pretty hard) it will be only on one surface, shouldn't impact the performance too much.

Roland.

+1.

I had the same situation with fungus in a Canon 50/1.2 lens. I had John Van Stelten at FocalPoint polish the coating off of 1 of the 10 glass surfaces in the lens, and I haven't noticed any difference.

::Ari

 

[f16sunshine]

Thanks guys. You re-enforce what I think is best as well.
Cheers

 

[Sonnar Brian]

Clean the haze. My 1948 Collapsible Nikkor was "very cheap" as it had a thick layer of haze each side of the aperture blades. 15 minutes, 100% off, no coating damage. My 1950 5cm F1.5 Simlar was worse. Cleaned up, no coating damage.

The wartime German Sonnars have a softer coating on the inner surfaces. I had to take heavy haze off the surface behind the aperture, and about 1/3rd of the coating came off with it.

5cm F1.5 CZJ SOnnar "T", converted to LTM, Wide-Open.

 

[Bill58]

I hate to ask the question, but did he try simple lab grade Acetone on a Q-tip? If that didn't/ doesn't work, polish it off.