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Porst Color Reflex 55/1.2 [135USD]
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BobDodds



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Joined: 13 Nov 2007
Posts: 87


PostPosted: Sun Oct 12, 2008 5:16 am    Post subject: Reply with quote

http://search.pbase.com/search?q=porst+55mm+f1.2
not much Noktonish to see there or flickr
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yalcinaydin



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Joined: 20 May 2008
Posts: 826
Location: Izmir, Turkey


PostPosted: Tue Oct 14, 2008 1:51 pm    Post subject: Reply with quote

I get it, a really cleans lens, there a few dust in it but no problem I guess. My Pentax adapter will be here 2 weeks later but I guess the mirror will definitely touch the rear metal parts of the lens as there is a few mm longer part than the rest of the mount.
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My name is "Yalcin", and exactly "Yalçın" and here you can find my MF samples:
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Right now switching back to AF because of work needs but I still love the MF lenses Smile
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BobDodds



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Joined: 13 Nov 2007
Posts: 87


PostPosted: Wed Oct 15, 2008 3:16 am    Post subject: Reply with quote

I have three of these. Watch http://fotist.com and one will be there soon. I could remove all the parts that stick out, because they don't do anything for us.

Actually two out of three do not have working diaphragms. I hope I don't have to pay $100-$125 for that fix on each.

Other 50/55's come very close to the mirror. These may have to have a lump ground off as well as clipping the aperture pin. That would mean grinding close to the glass. I will try to test it against a pancolar 50, and fix the Porst to focus to infinity on my Sigma SD14.
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Flor27



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Joined: 13 Sep 2007
Posts: 1195
Location: Paris, France


PostPosted: Fri Oct 17, 2008 2:30 pm    Post subject: Reply with quote

yalcinaydin wrote:
I get it, a really cleans lens, there a few dust in it but no problem I guess. My Pentax adapter will be here 2 weeks later but I guess the mirror will definitely touch the rear metal parts of the lens as there is a few mm longer part than the rest of the mount.

Yes, the rear part of the lens (auto diaph lever) will touch the 5D's mirror. That, for all PK mount lenses Crying or Very sad
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Switching from M42 to Minolta MD & Contax/Yashica
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yalcinaydin



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Joined: 20 May 2008
Posts: 826
Location: Izmir, Turkey


PostPosted: Mon Oct 27, 2008 7:59 pm    Post subject: Reply with quote

Flor27 wrote:

Yes, the rear part of the lens (auto diaph lever) will touch the 5D's mirror. That, for all PK mount lenses Crying or Very sad

I've just removed the 3 screws and released the back metal part, nothing touches anything at the moment so no hardcore work is needed to work with my 5D but infinity focus is problematic with the mirror as usual Sad

But I didn't like it's performance at f:1.2. It's "SoftLens" at f:1.2 even in the center and everything is blurry. I haven't used anything wider than f:1.4 so my question is there somthing that I must do or is there a trick. Now I'm really sorry for selling my Super Takumar 50/1.4 but I've givven it to my friend so it won't be a problem taking it back I guess.

Here are the results at 1.2, 2, 2.8, 4, 5.6 at ISO200. 5D is on tripod.
It's soft untill f:2.8, ultra-soft blurry results at f:1.2. Really dissapointment Crying or Very sad My Rollei Planar 50/1.8 performs clearly better for just 1/4 price...

100% crop @f:1.2:



http://www.flickr.com/photos/yalcinaydin/2978492013/

@f:2 it's much better but still soft on the center.
I'm uploading the original files at the moment I'll give the link when it finishes.
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My name is "Yalcin", and exactly "Yalçın" and here you can find my MF samples:
http://www.flickr.com/photos/yalcinaydin/sets/
Right now switching back to AF because of work needs but I still love the MF lenses Smile
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yalcinaydin



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Joined: 20 May 2008
Posts: 826
Location: Izmir, Turkey


PostPosted: Mon Oct 27, 2008 8:16 pm    Post subject: Reply with quote

Can this be the cause? I removed the black metal from back of the lens.

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My name is "Yalcin", and exactly "Yalçın" and here you can find my MF samples:
http://www.flickr.com/photos/yalcinaydin/sets/
Right now switching back to AF because of work needs but I still love the MF lenses Smile
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F16SUNSHINE



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Joined: 20 Aug 2007
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Location: Left Coast

Expire: 2011-11-18

PostPosted: Mon Oct 27, 2008 8:26 pm    Post subject: Reply with quote

Sorry Brew
It's time to make lemonade Sad
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no-X



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Joined: 19 Jul 2008
Posts: 2499
Location: Budejky, Czech Republic


PostPosted: Mon Oct 27, 2008 8:33 pm    Post subject: Reply with quote

I believe this glare is mostly caused by sensor reflections. The optical design seems to be good (text is not blurred, but the glare only removed all contrast). This is why many manufacturers highlight importance of special MC layers for digital cameras, esp. for fast lenses. From all M42 lenses I have tried, S-M-C from Asahi resisted sensor reflections best. Thats why i prefer good MC layers to sharpness for fast lenses...
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yalcinaydin



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Joined: 20 May 2008
Posts: 826
Location: Izmir, Turkey


PostPosted: Mon Oct 27, 2008 8:42 pm    Post subject: Reply with quote

Whole set:
http://www.flickr.com/photos/yalcinaydin/sets/72157608422358642/
@F16SUNSHINE
I'm really sad to hear that, does this mean that I've a bad copy or a common problem? I need to know this cause I will give a sale ad tomorrow.

@no-X
This is also MC: PORST COLOR REFLEX MC AUTO 1.1.2/55mm Nr.002368
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My name is "Yalcin", and exactly "Yalçın" and here you can find my MF samples:
http://www.flickr.com/photos/yalcinaydin/sets/
Right now switching back to AF because of work needs but I still love the MF lenses Smile
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no-X



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Joined: 19 Jul 2008
Posts: 2499
Location: Budejky, Czech Republic


PostPosted: Mon Oct 27, 2008 8:48 pm    Post subject: Reply with quote

Yes, but there are big differences in MC quality between various manufacturers. I already posted this:

f/1.8 - MC Pancolar / SMC Takumar:



Pancolar is sharper, but its MC is not effective agains sensor reflections, which caused glare and lack of contrast around the text and edges. Takumar is not as sharp, but SMC works and suppresses most of them.
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yalcinaydin



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Joined: 20 May 2008
Posts: 826
Location: Izmir, Turkey


PostPosted: Mon Oct 27, 2008 8:58 pm    Post subject: Reply with quote

Takumar is clearly better.
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My name is "Yalcin", and exactly "Yalçın" and here you can find my MF samples:
http://www.flickr.com/photos/yalcinaydin/sets/
Right now switching back to AF because of work needs but I still love the MF lenses Smile
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yalcinaydin



Level 3

Joined: 20 May 2008
Posts: 826
Location: Izmir, Turkey


PostPosted: Mon Oct 27, 2008 9:08 pm    Post subject: Reply with quote

Here is the sample that is enough to curse the lens:
1-Porst 1.2/55@1.2, center 100% crop
2-Porst 1.2/55@1.8 (roughly), center 100% crop
3-Porst 1.2/55@2, center 100% crop
4-Canon Ef 1.8/50 II@1.8, center 100% crop


the suspicious thing is I see from the image much more cleaner on the optical visor but there is something else messing around. I'll try it with K100D super before judging the seller. If it's faulty then I'll give it back to the seller and request my money back.
_________________
My name is "Yalcin", and exactly "Yalçın" and here you can find my MF samples:
http://www.flickr.com/photos/yalcinaydin/sets/
Right now switching back to AF because of work needs but I still love the MF lenses Smile
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F16SUNSHINE



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Joined: 20 Aug 2007
Posts: 5479
Location: Left Coast

Expire: 2011-11-18

PostPosted: Mon Oct 27, 2008 9:11 pm    Post subject: Reply with quote

It could be copy variation or it could be the simple personality of the lens or even a potential problem.
If it does become sharp eventually. Likely it is not a mis-aligned element.
The internal reflection problem is not usually so pronounced in low light.
Anytime you have a big flat rear element you can get reflections from it.
When I use the 1.4/55 Tomioka or 1.2/55 Tomioka this can come up.
It rarely is so troublesome as your samples.
I think this is simply the personality of the lens.
Fast f.1.2 lenses can be like this. The shots remind me of the Canon 50mm .95 that I had a few years ago.
It gathered lots of light but was glowing until f2.
My honest advise is. Try using the lens on a real subject in the way it is intended.
Go out tonight and shoot at some subject in minimal light and with varying distances.
Don't be too disappointed Yalcin. It will be easy to sell if you don't love it. Cool
People love fast lenses.
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no-X



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Joined: 19 Jul 2008
Posts: 2499
Location: Budejky, Czech Republic


PostPosted: Mon Oct 27, 2008 9:19 pm    Post subject: Reply with quote

yalcinaydin wrote:
the suspicious thing is I see from the image much more cleaner on the optical visor but there is something else messing around.

Believe me. It's caused by sensor reflctions. When you look through viewfinder, you won't see them, because they arise not until the mirror is tilted and the light lightens the sensor. Thats why you cannot see it through the viewfinder - it's another optical way, where these reflections doesn't exist. Try the lens on film - it will be much better.
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Attila



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Joined: 24 Feb 2007
Posts: 44750
Location: Budapest,Hungary

Expire: 2012-11-18

PostPosted: Mon Oct 27, 2008 9:29 pm    Post subject: Reply with quote

My copy was excellent.
http://www.mflenses.com/gallery/v/japenese/othermaker/ports_55mm_f1_2/
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35mm: Konica A4, Konica IIIA, Konica FC-1
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Film: Foma,Kodak, Fuji DIY development C41, FOMA LQR
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