M-Rokkor 28/2.8: Spots, Schneideritis, Haze - How can I decide, what's what?

krötenblender

krötenblender

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Hello

I've read the threads about that lens and now got one included in a full CLE equipment (CLE, 90, 40, 28, Flash, some Filters, Bag...) in a good condition for a very reasonable price.

However, the 28 M-Rokkor has at least two different kinds of white spots. I guess, the bigger ones at the edge of the lens is what is called Schneideritis and only a cosmetic problem. But the smaller spots in the center I can not relate to either haze or the "famous" white-spot-problem of the 28mm.

Has anyone here experience with these spots and knows what's what?

I like to give the lens to a repair-service and like to know in advance with what I'm dealing here. I like to use it on my R-D1 (and on my CL and my new CLE, of course) and have not seen any problems with the images so far. But since the R-D1 has not that much of resolution and high dynamic output, it might be acceptable there, but simply unusable on a film-camera.

Thanks for any input.

M-Rokkor-2828-Spots.jpg
 
Yours lens have already been opened - there are two cuts on the front ring in order to unscrew the front element. And the spots are still there so I guess that it is not possible to remove them:/
 
Hello,
my M-Rokkor 28 mm f/2,8 also two cuts in the ring holding the front lens but there is not a sign of white spots on the inside of the lens. However there is a kind of stitched collar around the inside of the front lens. I think this lens has been refurbished at Minolta, USA some time ago. I bought it from a dealer in the US a year ago. Some years ago I had another such lens but it was full of white spots, all of them in different sizes. That lens had no collar inside. I had to sell it to a very reduced prize.
 
Until now, I can't really tell the difference, but I'm pretty sure, that the big spots at the border are coming from Schneideritis. I don't care about that, since it's only a cosmetical problem, and I do not want to sell the lens, but use it. - For now, it doesn't seem cause any visible artifacts on my R-D1.

But I do care about the small spots in the center. I will try to find a camera-repair-service who knows, if this can be fixed. I wrote a mail to a service in the Netherlands and got a quick reply, but they are closed from next week for some weeks. If I find one here in Germany and get it fixed, I will show the results here.

Anyway, if someone can tell, what the spots in the center are, I would appreciate that.
 
krötenblender said:
If I find one here in Germany and get it fixed, I will show the results here.
Click to expand...

Hallo,

that would be very kind. I have a 28mm Rokkor here as well, which is starting to develop these white spots....when i bought it like 3 years ago, there was no single spot.:bang:

I would like to bring it so service, before the spots are goinig in the middle destroying the coating.

In the last repair shop, I had this lens, they told me, that this is unrepairable, because the elements are cemented together. But I don't believe them. I think it can be fixed.

Thanks and kind regards,

Jan.
 
In another thread, there is a link to Will Van Manen camera service in The Netherlands, it seems he performs cleaning of Schneideritis/Haze for relatively reasonable prices, I am sending the 28 Rokkor I bought for 170 EUR to him when I get the money, I think he charges 75 EUR excluding postage, that to me makes it worth it even though it's just a cosmetic problem.

http://www.kamera-service.info/
 
hexiplex said:
In another thread, there is a link to Will Van Manen camera service in The Netherlands, it seems he performs cleaning of Schneideritis/Haze for relatively reasonable prices, I am sending the 28 Rokkor I bought for 170 EUR to him when I get the money, I think he charges 75 EUR excluding postage, that to me makes it worth it even though it's just a cosmetic problem.

http://www.kamera-service.info/
Click to expand...

Yes, I found them in the other thread, too. I'm already in contact with them and will send them mine, too.
 
Since it's been opened anyway and is willing to be opened a second time, why don't you open it yourself ? I would with no hesitation, when I observe this condition.
 
jsrockit said:
Before you do anything, I'd use it as is and see what you get... :)
Click to expand...

Well, I do use it and I like it despite it's condition. It's very nice on the R-D1 and on film. But on the E-P2 it seems to give odd results.

I send it in, because I have enough other lenses I like, so I can live without it for some time. And if they can really fix it, it's worth the money.

I also opened it, but the backside of the front lens is unreachable nevertheless. It' glued into some kind of tube with some other lenses. I guess, with my tools I cannot reach the spotted side without breaking the thing.
 
It's back:

M-Rokkor-2828-NoSpots.jpg


I'm impressed... Decide yourself, if it's worth the money, I have to pay 200 Euros. But for me it's worth it, since I really like the lens. The dust in the picture is not in the lens, but on the lens... My fault.
 
Same lens, same problem - same repair-service, same money

I'm also impressed. Looks like new!
 

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Kavenzmann said:
Same lens, same problem - same repair-service, same money
Click to expand...

...and same day. :eek: - I hope, they did not switch our lenses... :D

First Images with R-D1 and E-P2 look very promising. No faults to see. I really love that lens, especially on my CLE. I'm really looking forward to the first roll with the 28 and Ektar 100.
 
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