Canon LTM Canon ltm 50mm f1.8

Canon M39 M39 screw mount bodies/lenses
That picture is _way_ beyond what my lens looked like. I just took a small flash light and tried pointing it at the the lens at various angles, looking at the surface of the glass from both sides as I did it.

I could easily see the surface of the glass looking hazy at certain angles. With the 35mm, I was able to see this just pointing holding the lens and pointing out a window during daylight. With the 50mm 1.8 it was only visible with a flashlight.

Again though, it didn't look anything like the image above. I'm impressed something so significant cleaned up as well as it did.
 
I'm not sure what that stuff was, Raid and Brian, but it came off easily with just Kodak lens cleaning solution. It did damage the coating of the element, but does not seem to have much overall effect when shooting it. I don't know the diagramatic make-up of the lens, other than it is six elements, but this was on the surface facing the rear of the diaphram. The blades are nice and clean though, and there was no other stuff that needed to be cleaned out.

PF
 
I have tried the chrome version and later black focus ring version (Type II). I like the color rendering of Chrome version more, though the contrast is quite high.

There is marking "Serenar" for earlier chrome version, which has only blue coating. The later one (without Serenar) with blue & gold coating should have better color balance.

5929694139_e8dc8bc9a8_z.jpg
 
I bought my copy with haze on the back of the rear-most element in the front group too. The aperture blades were also seized with oil so I dismantled the diaphragm and cleaned and rebuilt it at the same time as cleaning the glass. Once it was all back together it was virtually mint.

However, about four months later I noticed the element was starting to haze up again. Easy enough to re-clean, but does anyone know what causes this to keep coming back if it's not aperture grease? I can't see any plastics that might be "out-gassing".
 
It could be the composition of the glass itself, since I have read about the dreaded "Canon Haze" being uncurable. It was fixed in later versions of the lens, and that is why I suspect the glass itself.

I bought a series of Sears 90-230mm zoom lenses for an M42 camera, and they all had the same problem on the same element. I took one apart and tried cleaning it, but was unsuccessful. It wasn't until I received a later build that I got a clear lens.

PF
 
johnamazement said:
I bought my copy with haze on the back of the rear-most element in the front group too. The aperture blades were also seized with oil so I dismantled the diaphragm and cleaned and rebuilt it at the same time as cleaning the glass. Once it was all back together it was virtually mint.

However, about four months later I noticed the element was starting to haze up again. Easy enough to re-clean, but does anyone know what causes this to keep coming back if it's not aperture grease? I can't see any plastics that might be "out-gassing".
Click to expand...

The oil at aperture blade "react" with the coating of the lens element, so you may easily find the rear lens element near aperture has haze or oil drops in many Canon lenses.

From my experience, Canon 50mm f/1.8 Type II and 100mm f/3.5 Type III are the worst ones, which most of them have haze. Also beware of the early Canon Serenar series, they are prone to haze too.
 
I foolishly gave my Canon 50 1.8 away to someone starting out, made me feel all warm and fuzzy for a while but man do I miss that lens.

I've been wondering about a 1.4 as a back up to my CZ Planar but the price on a good one is crazy, even the 1.8 is looking expensive now. Maybe one day I'll have another...
 
I have two such lenses, and I will inspect both carefully for any internal haze. When clean and well alligned, a Canon 50.1.0 is a great lens to use.
 
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