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Mir-47N
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PostPosted: Thu Mar 29, 2007 8:00 pm    Post subject: Reply with quote
Attila wrote:
Please put pictures to ftp site and one from the lens itself thank you!


but mind, all pictures will be taken at f/22 Crying or Very sad

This sacrifices much the image quality because of the diffraction effect.


PostPosted: Thu Mar 29, 2007 8:04 pm    Post subject: Reply with quote
ooh, better than nothing I will show this fact and when you have a good copy I will replace pictures


PostPosted: Sun Apr 01, 2007 3:52 pm    Post subject: Reply with quote
ok the weather is cr**py but I will go out and take some samples anyway for you, since the lens must leave tomorrow. Crying or Very sad


PostPosted: Sun Apr 01, 2007 4:05 pm    Post subject: Reply with quote
Ok, no problem , next time hopefully you will get a perfect copy.


PostPosted: Sun Jul 05, 2009 4:47 pm    Post subject: Reply with quote
bought a used Mir 47K last week. The body looks in quite bad shape, quite a few markings on the coating too, but no scratches, no fungus and mechanically working alright.

The first photos I took here in Vietnam ( where I had found the lens ) were as much as useless because strong highlights were 'flooding' the adjoining areas with light. It is not easy to avoid strong highlights with the tropical sun here in Vietnam but it seems that they really must be avoided. The lens does not have the filters ( or at least I think it does not have them..) - where should they go? Could the missing filters be a reason why it is 'flaring' so badly? Not even sure if this qualifies as flaring..

I do not have many samples to show yet, but I hope that soon I will have some which hopefully will be good enough to add to Orio's f22 shots at the ftp, if Attila wants me to, though they will be on APS-C sensor of my Pentax *istDs.

here some first samples,
first was taken at f4 or the next 1/2 step between f4 and f5.6 and ISO 800





second one ISO 400, don't remember f stop.

( here the set were original size can be viewed: http://www.flickr.com/photos/kuuan/sets/72157620334141135/ )

cheers,
kuuan - andreas

( edit january 2013: replaced broken link with photo )

Last edited by kuuan on Fri Jan 11, 2013 9:54 am; edited 3 times in total


PostPosted: Sun Jul 05, 2009 5:13 pm    Post subject: Reply with quote
Wow Andreas! Are you on an Asia tour ? Great samples! I especially like #2 one.


PostPosted: Sun Jul 05, 2009 5:21 pm    Post subject: Reply with quote
Attila wrote:
Wow Andreas! Are you on an Asia tour ? Great samples! I especially like #2 one.


ha ha Attila, I am in Asia for 9 months every year, and that since many many years..more or less living out of a suit case which does not make my lens hobby all that easy, lenses do make about 75% of my luggage Wink

the bridge in the second photo is the socalled 'Trang Tien' bridge in Hue, the old imperial city of Vietnam, a famous iron bridge designed and built by Gustave Eiffel, the same one who built the Eiffel tower in Paris, see: http://rol.vn/weben/chuyende/vietnaminsight/2009/06/09/103748/1059/

Did I not post photos from Nepal here too? I had taken many portraits there with Tak 50/1.4 and 28/3.5 about 2 months ago , maybe my most successful so far and I had shown them off quite a bit.
If interested please view the corresponding collections / sets at my flickr set.

best greetings,
Andreas

Last edited by kuuan on Sun Jul 05, 2009 6:45 pm; edited 2 times in total


PostPosted: Sun Jul 05, 2009 5:47 pm    Post subject: Reply with quote
How lucky you are ! I am green from envy Embarassed I look your photos on flickr!


PostPosted: Sun Jul 05, 2009 9:24 pm    Post subject: Reply with quote
Shame it came broken, there is another one fleabay right now with 200$ BIN though in pentax mount.


PostPosted: Mon Jul 06, 2009 11:05 am    Post subject: fungus does effect IQ!? Reply with quote
have some more samples taken with the Mir 47K now

let me exemplify what I meant with highlights flooding the surrounding areas:



OK, those conical hats are covered with plastic to also function for rain protection, and during daylight almost always cause blown highlights, but it seems that the Mir softens the areas around the blown highlight.

another example:


but there an other fault of my copy can be noticed: it has very soft areas on the left side, specially upper left:


100% crops of the areas in question:



these spots can be noticed on almost every photo:


I knew that the lens was not very clean, actually thought that the coating was effected, but a closer look tells me that is must be fungus, what do you think?



and the two spots in the middle of the lens seem exactly to be situated where the soft spots on the image appear, the smaller but more concentrated one causing the more worse spot on the top left side, the bigger but less dense one the soft area at the lower left side ( the writing 2.5/20 is on the left side of the lens when mounted )

and I always had thought that fungus does not have any noticeable effect on image quality..
Would you concur that the soft spots must come from the fungus?
( I was considering starting a new thread named: fungus does effect IQ or something alike )

thank you for any opinion,
best greetings,

kuuan - andreas


PostPosted: Mon Jul 06, 2009 12:45 pm    Post subject: Re: fungus does effect IQ!? Reply with quote
kuuan wrote:

I knew that the lens was not very clean, actually thought that the coating was effected, but a closer look tells me that is must be fungus, what do you think?


Shocked Shocked
That is a fungus festival !!

kuuan wrote:
and I always had thought that fungus does not have any noticeable effect on image quality..
Would you concur that the soft spots must come from the fungus?


Yes, they most certainly come from the fungus, and I'd say the fungus may play a role in the flare episodes, also.

You have to remember that the focal lenght of a lens is very important in the determination of the optical defects.
A fungus colony that might remain almost undetectable on a tele lens, will be much more visible on a wide angle, and become definitely annoying on a superwide angle.
Super wide angle lenses have a very deep DOF, and close focusing, by their own nature. So a spot of fungus can be close enough to the focal point to become visible even if just as a blot.
Make a test, point to the sky and take a photo with the iris fully stopped down. I am sure that you will be able to see on your picture, the map of all your fungus colonies.
-


PostPosted: Mon Jul 06, 2009 4:58 pm    Post subject: Re: fungus does effect IQ!? Reply with quote
Orio wrote:

Shocked Shocked
That is a fungus festival !!


Laughing Rolling Eyes

Orio wrote:
Yes, they most certainly come from the fungus, and I'd say the fungus may play a role in the flare episodes, also.


that gives me hope, Orio, because I will try to get it cleaned here in Ho Chi Minh City, and very likely they can do it and for cheap!
I remember having read somewhere that this lens really does have a flare issue though, but any improvement would be very much appreciated.

Orio wrote:
You have to remember that the focal lenght of a lens is very important in the determination of the optical defects.
A fungus colony that might remain almost undetectable on a tele lens, will be much more visible on a wide angle, and become definitely annoying on a superwide angle.
Super wide angle lenses have a very deep DOF, and close focusing, by their own nature. So a spot of fungus can be close enough to the focal point to become visible even if just as a blot.
Make a test, point to the sky and take a photo with the iris fully stopped down. I am sure that you will be able to see on your picture, the map of all your fungus colonies.
-


Oh yes Orio, this makes so much sense, but I never had thought abut this, have not been aware of the fact that focal lenght does play an imoprtant role in lens defects.

Once I had taken some experimental shots with varius lenses pointing at distant light sources at night with the lens wide open and out of focus. The resulting circles which had a very defined outer line showed something which I was wondering if it was not the dust of the lens. Could that be?:


(there were others with more dirt, but I had deleted them all...)

I very much hope that I can show here soon photos taken with the same lens which are clean, even less flaring!

best regards,
andreas


PostPosted: Mon Jul 06, 2009 6:02 pm    Post subject: Reply with quote
Do as I said, point camera to empty sky (no clouds) or white wall, focus to minimum distance and stop down aperture to the smallest.
You will get a nice detailed map of your fungus.


PostPosted: Tue Jul 07, 2009 11:28 am    Post subject: Reply with quote
Orio wrote:
Do as I said, point camera to empty sky (no clouds) or white wall, focus to minimum distance and stop down aperture to the smallest.
You will get a nice detailed map of your fungus.


tried to..yesterday night with a white wall, this morning pointing at sky. Could not see anything on the LCD of the camera, and accidentally deleted the test photos before uploading to my PC.

but now I have no more need for that..because after 40 minutes in a repair shop while I took a 'ca phe' the lens now looks like this Very Happy



only have had time for one fast test shot:



if the flare issue has become much better I still have to verify

best regards,
andreas


PostPosted: Thu Jul 09, 2009 5:23 am    Post subject: Re: fungus does effect IQ!? Reply with quote
Orio wrote:
...
Yes, they most certainly come from the fungus, and I'd say the fungus may play a role in the flare episodes, also.
-


yes, as always you were very right Orio!...after cleaning the lens flare looks not to be a big issue any more:



very happy now, and the Mir47K seems to quite a decent performer


PostPosted: Thu Jul 09, 2009 12:57 pm    Post subject: Reply with quote
Congratulation on your rejuvenated lens!


PostPosted: Thu Jul 09, 2009 3:10 pm    Post subject: Reply with quote
ChrisLilley wrote:
Congratulation on your rejuvenated lens!

thank you Chris, I am very happy someone shares my joy Very Happy

today I took the first 'not so bad?' photo with it:


best regards,
Andreas


PostPosted: Thu Jul 09, 2009 5:02 pm    Post subject: Reply with quote
Congratulations!
I see images of a good lens!


PostPosted: Sat Jul 11, 2009 8:01 am    Post subject: Reply with quote
Orio wrote:
Congratulations!
I see images of a good lens!


thank you Orio..I am having fun with it!
As I often shoot handheld low light I specially like it being fast for a wide angel, e.g.: 'days flying by':


( at my fav. coffee shop in Saigon, handheld with ISO 1600 and 1/30 sec )


PostPosted: Sun Jul 12, 2009 8:18 pm    Post subject: Reply with quote
another low light shot:



- but now I wonder: is it ok to 'show off' photos in this thread? - or should they better be posted in the 'gallery'?


PostPosted: Sun Jul 12, 2009 8:31 pm    Post subject: Reply with quote
kuuan wrote:

- but now I wonder: is it ok to 'show off' photos in this thread? - or should they better be posted in the 'gallery'?


That depends entirely on your judgement.
The photos posted in this section serve for the discussion about the lens - they can be either simple tests or full-fledged photos, in any case their purpose is to support a discussion on the lens.
The Gallery is there for the photos that the author considers complete works in themselves, that is, they do not (only) exist as sample photos but have a reason to be that is self-sufficient and independent from the purpose of showcasing a tool.
To decide which photo is what depends entirely on the author. We have no jury to decide that for you. Smile


PostPosted: Fri Jan 11, 2013 5:10 am    Post subject: Reply with quote
Oh my dream lens, this lens is so much awesome, the pic was taken on evening sunlight is so much beautiful!!!


PostPosted: Fri Jan 11, 2013 4:49 pm    Post subject: Reply with quote
yatafa_hi wrote:
Oh my dream lens, this lens is so much awesome, the pic was taken on evening sunlight is so much beautiful!!!


thank you, soon you may be able to play with mine a bit Wink
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