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Porst Color Reflex 55/1.2 [135USD]
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PostPosted: Sat Oct 11, 2008 10:15 am    Post subject: Porst Color Reflex 55/1.2 [135USD] Reply with quote

I find one in one of local sites, should I buy this.
I sounds really cheap for a f:1.2 lens but I don't know much about Porst brand and especially this lens.
By the way its Pentax K bayonet, I should buy an adapter for my 5D but not an expensive thing so no problem.

I've bought for 135USD.


Last edited by yalcinaydin on Wed Apr 08, 2009 9:33 pm; edited 2 times in total


PostPosted: Sat Oct 11, 2008 10:37 am    Post subject: Reply with quote

Our forum's search functions gives error to me but I've remembered to use google and find also topic from here:
http://forum.mflenses.com/today-i-got-a-porst-55mm-f1-2-mc-pentax-k-lens-t4102.html

From these samples I guess I can buy it Smile
With f:1.2 and ISO3200 it can give nice results in concerts Smile
http://www.flickr.com/photos/sunsetlight/tags/5512/


and I've read this one also from http://forum.manualfocus.org/viewtopic.php?id=9417:
Quote:
The other one was the Porst 1.2/55 (6 lenses, 6 elements) with Pentax-K bayonet. It was made by Cosina in the late 70's, early 80's to be sold with their Pentax-K bayonet bodies (e.g. Cosina CT-4 - relabeled as Porst compact reflex AM; see http://www.kamera-geschichte.de/files/p … lex_am.htm). Well built and quite good at f/2, but with lots of flaws like coma, spherical abberations, CA wide open.
It has nothing to do with Tomioka or their Tomioka 1.2/55 M42 lens (7 lenses, 6 elements) from the early 70's.


PostPosted: Sat Oct 11, 2008 11:25 am    Post subject: Reply with quote

I've got the exactly same lens in Tokyo, actually my friend rented it to me
permanently(!). After coming back to Toronto, I will put up the photo in here.

This lens is definitely made by Cosina according to my Porst specialist.
Anyhow any lens is far better than my ability of making images. Surprised

@Yokohama (port city south of Tokyo)


PostPosted: Sat Oct 11, 2008 1:15 pm    Post subject: Reply with quote

It is quite cheap for an f1.2 lens. I don't know this particular model and sometimes PK-lenses can have a problem with the 5D mirror.
Can you "try before buy"?


PostPosted: Sat Oct 11, 2008 1:49 pm    Post subject: Reply with quote

http://www.mflenses.com/gallery/v/japenese/othermaker/ports_55mm_f1_2/

Pretty good lens.


PostPosted: Sat Oct 11, 2008 2:09 pm    Post subject: Re: Porst Color Reflex 55 mm f:1.2 = 135USD? Reply with quote

yalcinaydin wrote:
I find one in one of local sites, should I buy this.
I sounds really cheap for a f:1.2 lens but I don't know much about Porst brand and especially this lens.
By the way its Pentax K bayonet, I should buy an adapter for my 5D but not an expensive thing so no problem.


I think Abbazz also has some good shots made with this lens http://forum.mflenses.com/bali-pictures-part-i-porst-tomioka-55-1-2-t3285.html


PostPosted: Sat Oct 11, 2008 3:26 pm    Post subject: Reply with quote

You will need to modify for use with 5D.
Or modify the 5D. Wink


PostPosted: Sat Oct 11, 2008 7:27 pm    Post subject: Reply with quote

F16SUNSHINE wrote:
You will need to modify for use with 5D.
Or modify the 5D. Wink

I guess I don't have much movement area left and this mirror should be shaved Smile

@Carsten:
No, as it is located 750km away from me Smile


PostPosted: Sat Oct 11, 2008 8:31 pm    Post subject: Reply with quote

And I have bought it Smile

I can finance it by selling my 2nd Rollei Planar 50/1.8 and Super Takumar 50/1.4. I guess if I really like the results I'll use 55/1.2 for speed and Planar 50/1.8 for creamy bokeh so Super Takumar is just in the middle of the two.


PostPosted: Sat Oct 11, 2008 8:35 pm    Post subject: Reply with quote

Congratst! It was a great deal!


PostPosted: Sat Oct 11, 2008 8:44 pm    Post subject: Reply with quote

God, how did i miss that one..and its a K-mount.... Crying or Very sad..

Hayırlı Olsun Smile


PostPosted: Sat Oct 11, 2008 8:44 pm    Post subject: Reply with quote

Attila wrote:
Congratst! It was a great deal!

Thanks Atilla, now I'll wait for the Pentax K adapters arrival which will probably be 2-3 weeks.

Throndor wrote:
God, how did i miss that one..and its a K-mount.... Crying or Very sad..
Hayırlı Olsun Smile

Sagol (Thanks in Turkish), I've seen it in fotokritik forum and couldn't resist but I'll probably sell 2 of my 5 normal lenses as I want the lenses not to collect but to use.


Last edited by yalcinaydin on Sat Oct 11, 2008 8:47 pm; edited 1 time in total


PostPosted: Sat Oct 11, 2008 8:45 pm    Post subject: Reply with quote

Hard time Wink


PostPosted: Sun Oct 12, 2008 4:52 am    Post subject: Reply with quote

I have three but they don't fit Sigma without work.


PostPosted: Sun Oct 12, 2008 5:08 am    Post subject: Reply with quote

Cosina Noxon 55mm f1.2

Start the legend.


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


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.


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.


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


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.


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.


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

Sorry Brew
It's time to make lemonade Sad


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...


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


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.