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Amazing IQ from humble Pentacon 100
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PostPosted: Thu Oct 01, 2009 12:16 pm    Post subject: Amazing IQ from humble Pentacon 100 Reply with quote
I took some tests shots for the new focusing screen and some of these with the Pentacon 2.8/100 black version, which is a lens that I paid something between 20 and 30 Euros.
Here's a whole and a crop, hand-held wide open (f/2.8 ), and I am impressed by the sharpness and the rich shades of colours, much more vibrant than my Contax Makro-Planar 2.8/100 on the same camera.
And also I'm impressed by the perfect focus I could achieve with the EG-S screen, it was never so easy to focus with MF lenses before.

whole:


crop:


PostPosted: Thu Oct 01, 2009 12:57 pm    Post subject: Reply with quote
Surely this lens not a 20-30 EUR value level, great lens indeed.


PostPosted: Thu Oct 01, 2009 1:06 pm    Post subject: Reply with quote
Attila wrote:
Surely this lens not a 20-30 EUR value level, great lens indeed.


Yes, and it is sharp wide open, so fully useable from f/2.8
(while several faster lenses are too soft wide open)


PostPosted: Thu Oct 01, 2009 1:19 pm    Post subject: Reply with quote
That's extremely good. I've just checked mine (electric version) and it gives the most horrible flare wide open, even in undemanding conditions.


PostPosted: Thu Oct 01, 2009 3:48 pm    Post subject: Reply with quote
Really great results.

You wrote about this EG-S screen, what is it exacly ? is it a splitscreen for the 5D? ...

Cheers
Tobias


PostPosted: Fri Oct 02, 2009 1:33 am    Post subject: Reply with quote
Yes, I'm curious about this EG-S screen too. Is it brighter than the previous one, because you mentioned it is easier to focus. Where did you buy it?


PostPosted: Fri Oct 02, 2009 1:38 am    Post subject: Reply with quote
tobbsman wrote:
Really great results.
You wrote about this EG-S screen, what is it exacly ? is it a splitscreen for the 5D? ...
Cheers
Tobias


Not a splitscreen. It's a plain matte screen, but while the standard screen is set to show differences in focus only from f/2.8 and beyond (in other words, it does not make any difference if you are using a f/2.8 lens or a f/1.2 lens, the screen will only show focus change as if your f/1.2 lens was a f/2.8 lens), the EG-S is set to show focus differences even at very large apertures. This in practice means that if you make even a tiny change of focus with your f/1.4 lens, the EG-S screen will show it, while the default screen will not. This translate in a nearly 100% success rate of manual focusing with fast lenses.
The drawback of this is that your viewfinder is darker.


PostPosted: Fri Oct 02, 2009 1:43 am    Post subject: Reply with quote
horvlas wrote:
Yes, I'm curious about this EG-S screen too. Is it brighter than the previous one, because you mentioned it is easier to focus. Where did you buy it?


if by previous one you mean the default screen, the EG-S is darker, not brighter.
The darkness is due to a different quality of microprisms, which, in the EG-S, allows to make visible also focus changes at the widest apertures (therefore= minimal focus movements). The default screen is thought and optimized to work with slow zooms which are the lenses of preference of many amateur photographers. For this reason it is brighter (many zooms especially the cheap ones, are slow), and you pay for the brightness with a coarser screen definition that does not allw you to focus safely in manual mode. Canon thinks that this is a secondary point since most zoom users will also use autofocus. Luckily they also provide this screen alternative for those people who want to have a greater manual focus control.

P.S. I bought it from an Italian online photo shop called Digifoto.


PostPosted: Fri Oct 02, 2009 3:06 am    Post subject: Reply with quote
Plain matte only? Has it got microprism in the centre?


PostPosted: Fri Oct 02, 2009 4:31 am    Post subject: Reply with quote
Orio
I am bemused by this lens - I have a 135/2.8 pentacon that is frankly very middle of the road. That is a stunning performance


patrickh


PostPosted: Fri Oct 02, 2009 6:19 am    Post subject: Reply with quote
Quote:

Not a splitscreen. It's a plain matte screen, but while the standard screen is set to show differences in focus only from f/2.8 and beyond (in other words, it does not make any difference if you are using a f/2.8 lens or a f/1.2 lens, the screen will only show focus change as if your f/1.2 lens was a f/2.8 lens), the EG-S is set to show focus differences even at very large apertures. This in practice means that if you make even a tiny change of focus with your f/1.4 lens, the EG-S screen will show it, while the default screen will not. This translate in a nearly 100% success rate of manual focusing with fast lenses.
The drawback of this is that your viewfinder is darker.


Grazie Mille Orio, for the explaination about this screen. I suppose one can only use it with a Canon ... or is it possible to use it with my Pentax too ?

Cheers
Tobias


PostPosted: Fri Oct 02, 2009 7:40 am    Post subject: Reply with quote
The crop is the most telling, such sharpness and smooth bokeh!

Superb lens.


PostPosted: Fri Oct 02, 2009 8:57 am    Post subject: Reply with quote
Really astonishing with such a small amount you pay.


PostPosted: Fri Oct 02, 2009 9:31 am    Post subject: Reply with quote
I think the 5DMkII, coupled with the skill of Orio, can make any lens shine (even the duds). It's all the fault of this forum that prices have skyrocketed Wink


PostPosted: Fri Oct 02, 2009 9:34 am    Post subject: Reply with quote
horvlas wrote:
Plain matte only? Has it got microprism in the centre?


Plain matte, unfortunately.


PostPosted: Fri Oct 02, 2009 9:38 am    Post subject: Reply with quote
tobbsman wrote:

Grazie Mille Orio, for the explaination about this screen. I suppose one can only use it with a Canon ... or is it possible to use it with my Pentax too ?


Well, there might be small difference in size, if useable or not depends really on the thickness, because a difference in widht or height can be sandpapered out (if too large) but if the thickness of the screen does not match precisely that of the Pentax screens, you will incur in focusing errors.

I have tried to fit a Contax screen into my Canon cameras, and they fit, fot width and height, with simply sandpapering a little tab. But the problem is that the thickness of the Contax screen is slightly different from Canon's and this causes a slight misfocusing - maybe not so visible in small pixel size cameras, but definitely visible on a 5D Mark II.


PostPosted: Fri Oct 02, 2009 12:47 pm    Post subject: Reply with quote
This amazing IQ is also coming from 5D mkII, isn't it?

The next time I encounter to this lens, I will grab it. Very Happy


PostPosted: Fri Oct 02, 2009 5:35 pm    Post subject: Reply with quote
koji wrote:
This amazing IQ is also coming from 5D mkII, isn't it?


Yes Smile


PostPosted: Fri Oct 02, 2009 6:34 pm    Post subject: Reply with quote
koji wrote:
This amazing IQ is also coming from 5D mkII, isn't it?

The next time I encounter to this lens, I will grab it. Very Happy


Not easy to get a good working copy , relative rare lens and many of them has mechanical problems and coating damages. I bought three or four under three years only one was trouble free.
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