35mm ULTRA PRIME GLOW EFFECT..

[santhosh anima]

Hi,
My 35 mm ULTRA PRIME has Glow effect.
There is No fungus In side the Lens and Anti glare Coating Seen to be fine.
What case is this?
Thanks

 

[Dan Kanes]

Could be a small amount of haze on some elements near the stop.

Does it change when you stop the lens down or open up?

This is a very wild theory but someone who serviced the lens might have put one element with similar radii in backwards.

Are you near any good service centers like Band Pro, Abel Cine, or Duclos ? Or maybe see if Arri will service it ?

 

[Jacek Zakowicz]

Make sure the front element has AR coating on the front surface. Uncoated front element will look give like this. But is could be a number of things. Start with the basics...

 

[Zack Birlew]

I've taken apart several lenses, cheap and expensive, anamorphic and spherical, and the main issues I've found tend to be reversed elements causing distortion and overall softness or complete inability to focus completely if at all. In this case, you seem to have a sharp image but there's veiling glare. My questions would be:

1. Is this your first time using this lens?
2. If it isn't, when did you notice this effect happening?
3. Shining a flashlight through the lens, do you see anything abnormal besides usual micro dust?
4. Have you looked around and seen test shots and footage of the lens in case this is normal for this particular lens in that scenario?
5. Has the lens been exposed to water, high humidity, or excessive heat?
6. Have you cleaned or wiped the lens recently? Did you use any cleaning agent? If so, what did you use?

Some lenses have a natural glow to them, like my Nikon 50mm 1.8 E-series vs. my regular Nikon 50mm 1.8 which doesn't glow with bright highlights, but if it's a lens that was clear and sharp but now glows then there is definitely something wrong. It would take a good deal of dust and certain circumstances but sometimes a lens may just need a basic cleaning for whatever reason. I don't know if you would want to go taking apart an Ultra Prime by yourself but check out my Instagram at @zackbirlew and you'll see some examples of lenses I've taken apart to give you an idea of what you may want to look for in terms of haze, fungus, oil, and other problems.

 

[santhosh anima]

Hi,

Here we have no authorized arri UP service center .I checked with my local technician we found there is Two lens glass stick together. the glue was look like melted don't no may be may be fungus.
How can get rid of . Picture attactead . thanks

https://ibb.co/KFJSnB0

https://ibb.co/rw6htMD

 

[Zack Birlew]

Hi, I got your message and looking at the pictures, it looks like haze but could be the beginnings of lens separation or, if not that, then some sort of gassing much like what happens to the glue chemicals particularly seen in unfortunate Mamiya 645 80mm 1.9 N lenses. If it’s just haze then it’s not too bad to get rid of, I use the cold cream method which is pretty light but messy. I use Pond’s Cold Cream Make Up Remover, particularly the one with Behenic Acid in it, there’s a couple different ones. You just rub a good amount all over the glass and let it sit for half an hour and then gently clean it off with lens tissue, preferably moist with lens cleaner like Zeiss brand, and then a nice final clean with microfiber cloth and lens cleaner. The light amount of acid is great for killing fungus and haze but, as I’ve learned, it can’t do miracles if the lens has been etched with fungus or haze that’s been on there too long. Beyond that, only a professional clean and polish would have a chance of saving the glass. Do note that the black trim on the edge of the glass will most likely come off to some degree if not completely. Often I’ve cleaned lenses where that black trim erodes and causes fungus and haze on its own regardless of whether there’s excess oil or moisture. It may not be very fancy but a run of a black sharpie pen on the edges can be a good placeholder for a more professional replacement if that happens and it blocks out inner edge reflections just as well. Lens cleaner with alcohol in it or another round of Pond’s can easily remove the black sharpie later. I know, it’s a weird method but it’s worked on all the lenses I’ve fixed and repaired that had fungus or haze problems and I just cleaned another lens tonight with great success! If the DIY approach is too much for you then finding a cinema lens repair company is your best and only solution.