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Prakticar Pentacon 135mm f2.8 (Made in GDR)
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PostPosted: Wed Jan 29, 2014 2:11 pm    Post subject: Prakticar Pentacon 135mm f2.8 (Made in GDR) Reply with quote
There is a local shop which is selling a Prakticar Pentacon 135mm f2.8 (Made in GDR) with 6 aperture blades. The focus mechanism is a little bit stiff and it has the usual dust specks.

How much is this lens worth? I'm seeing prices on ebay for 200 dollar, and sometimes around 20/30 dollar.
And could the stiff focus mechanism be fixed/cleaned?


PostPosted: Wed Jan 29, 2014 6:50 pm    Post subject: Reply with quote
You may be confusing it with bokeh monster copy.


PostPosted: Wed Jan 29, 2014 6:58 pm    Post subject: Reply with quote
This is a 10-20 USD lens especially in this condition , 200 USD lens has lot more blades and M42 or Exakta lenses.


PostPosted: Wed Jan 29, 2014 7:20 pm    Post subject: Reply with quote
Even the bokeh monster version shouldn't be more than $100!

This one, peanuts Smile


PostPosted: Wed Jan 29, 2014 7:51 pm    Post subject: Reply with quote
ManualFocus-G wrote:
Even the bokeh monster version shouldn't be more than $100!

This one, peanuts Smile


Though if you can get it for peanuts, it is well worth having. In my limited experience the newer 6 blade version is one of the worst lenses for sticky blades, though, so check it thoroughly, or be prepared to take it apart and clean, unless you want to just use it at f2.8


PostPosted: Fri Jan 31, 2014 10:19 am    Post subject: Reply with quote
Basilisk wrote:
Though if you can get it for peanuts, it is well worth having. In my limited experience the newer 6 blade version is one of the worst lenses for sticky blades, though, so check it thoroughly, or be prepared to take it apart and clean, unless you want to just use it at f2.8

In my experience, these are really easy to disassemble and clean. This lens is one of the easiest to dismantle. Use lighter fluid to carefully wipe the blades, or take the aperture out and give it a soak in that fluid; both are pretty easy do to due to how this lens is constructed.


PostPosted: Fri Jan 31, 2014 10:35 am    Post subject: Reply with quote
aoleg wrote:
Basilisk wrote:
Though if you can get it for peanuts, it is well worth having. In my limited experience the newer 6 blade version is one of the worst lenses for sticky blades, though, so check it thoroughly, or be prepared to take it apart and clean, unless you want to just use it at f2.8

In my experience, these are really easy to disassemble and clean. This lens is one of the easiest to dismantle. Use lighter fluid to carefully wipe the blades, or take the aperture out and give it a soak in that fluid; both are pretty easy do to due to how this lens is constructed.

Thanks for the info - do you re-lube the blades or leave them clean?
Now I have a CZJ 135 f3.5, I might risk destroying my Pentacon, it is a worthwhile lens and f2.8 is worth having for the bokeh.

Does this have a different optical construction from the earlier "Bokeh Monster", or is it just the lack of the many bladed aperture that makes it less desirable?


PostPosted: Fri Jan 31, 2014 1:35 pm    Post subject: Reply with quote
Never ever lube the blades. They should always be as dry as hell! Clean them, dry them and put them back.


PostPosted: Fri Jan 31, 2014 4:39 pm    Post subject: Reply with quote
zanxion72 wrote:
Never ever lube the blades. They should always be as dry as hell! Clean them, dry them and put them back.


true for auto lenses, on fully manual lenses some oil okay, in hot storage oil easily go to glass... so better to keep them dry an clean , many of fully manual lenses usually from eastern block of Europe has little oil on blades.


PostPosted: Fri Jan 31, 2014 6:54 pm    Post subject: Reply with quote
I heard the takumar 200mm 3.5 is the real bokeh monster (better than this guy) is it true?


PostPosted: Fri Jan 31, 2014 7:29 pm    Post subject: Reply with quote
not true, different bokeh is true, what is better depend by your taste A people love a bokeh B people hate it... I like Pentacon better .


PostPosted: Fri Jan 31, 2014 8:56 pm    Post subject: Reply with quote
Attila wrote:
not true, different bokeh is true, what is better depend by your taste A people love a bokeh B people hate it... I like Pentacon better .


@Attila: now because you just said that, I have to buy the Pentacon.. Smile

Is the Meyer Optik version same thing?


PostPosted: Fri Jan 31, 2014 9:37 pm    Post subject: Reply with quote
There are several versions of the Pentacon lens:

1. (oldest) - Meyer Optik Orestor 135/2.8 preset - true bokeh monster (zebra finish - M42 or Exakta)
2. Pentacon 135/2.8 preset - true bokeh monster (zebra finish - M42 or Exakta)
3. Pentacon 135/2.8 preset - true bokeh monster (black finish with red, green, orange or yellow numbers on the barrel - M42 or Exakta)
4. Pentacon 135/2.8 auto MC - 6 blade non-bokeh monster but same optical design - (black finish - M42)
5. Pentacon 135/2.8 electric MC - as above
6. Prakticar Pentacon 135/2.8 - as above but in Prakticar PB mount
7. Carl Zeiss Jena P Prakticar 135/2.8 - as above

All are great, but the preset (bokeh monster) versions are best IMO!


PostPosted: Fri Jan 31, 2014 9:39 pm    Post subject: Reply with quote
Laughing basically all have very smooth creamy bokeh, they are different a bit , as usual difference is not much. Meyer-Optik Görlitz was standalone factory from beginning like Carl Zeiss Jena or Leitz , ~1970 East German factories were melted to one factory Pentacon GmbH, built quality is lot more better of Meyer than Pentacon, latest Pentacon pretty crappy mechanically, optically fine lenses.
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