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Lens to sharp and to contrasty?
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PostPosted: Tue Jun 17, 2008 11:42 pm    Post subject: Lens to sharp and to contrasty? Reply with quote
Yes, I think so. This is about Tessar 4.5/40 which was set to f11. Look what happened. I still have PEF-s if anybody doesn't believe that I didn't touch them except converting to tiff, cropping, compressing, resizing and converting to jpg using "save for web" with cs2. ISO 100, 1/6s, WB set to Auto.







Last edited by voytek on Tue Jun 17, 2008 11:56 pm; edited 1 time in total


PostPosted: Tue Jun 17, 2008 11:46 pm    Post subject: Reply with quote
Did you take any shots at other f/stops?

#2 is REALLY sharp. I do not think the sharpness is the big issue, I think it is the contrast that makes it look odd.


PostPosted: Wed Jun 18, 2008 12:03 am    Post subject: Reply with quote
No, I didn't. I know that this one is one of the sharpest CZJ lenses and I wanted to check it. Lens was delivered yesterday with Flektogon 2.8/65 from Slovakia and I had opportunity to make only a few photos.
#2 looks really odd, unpleasant.


PostPosted: Wed Jun 18, 2008 12:18 am    Post subject: Reply with quote
I don’t think you could consider an old Tessar as ‘Too sharp’ certainly a fine lens but not great.
I would agree the problem is contrast which is down to your PP work rather than the lens or camera.
‘Except converting to tiff, cropping, compressing, resizing and converting to jpg using "save for web" isn’t exactly “not touching them” there is a lot can go wrong there.
Are you shooting JPEG or RAW? Are you converting the RAW file with Pentax software (Useless) or ACR? Are you just sticking to defaults or actually doing a real conversion? I shoot DNG with my K10D, IMO it is much better.

PS 1/6 sec outdoors is far too slow (For this type of shot) for consistant results. The slightest air movement is going spoil your shots.


PostPosted: Wed Jun 18, 2008 1:52 am    Post subject: Reply with quote
If PP means post processing - I did not try to improve photo. I shot photos in RAW - PEF. This way I can get resolution 3896x2616 and file is 10Mb. CS2 doesn't read PEF format. I open files with Faststone. Under edition you can change many parameters before converting photo to TIFF but I didn't do it. Then I save file as tiff. I open tiff with cs2 and using "save for web" change longer side to 700 pixs. Then I compress file to 150-300mb, depends. This time I cropped all 3 photos and set size of file to receive 100%. And saved them as JPGs. I hope I answered your question.
Regarding which lens is fine and which is great. I can not be a judge. For me is great. I am a rookie. I make photos few months only - Pentax body was delivered Dec 26.2007 and first lens I bought around Jan 15. Since then counter in my pentax shows about 10.000 taken pictures.
I don't have problems with choosing the lens. I take this one which I like to use. Actually my Tomioka 1.2/55 is not between my favorites, Tomioka 2.8/60 - it is. Most of the photos I take using Vivitar 2.5/28. I like it very much. Photo below was taken last Sunday in Kenosha, WI.



The SN is 22xxxxxx. Kiron aka Kino Opics


PostPosted: Wed Jun 18, 2008 6:45 am    Post subject: Reply with quote
Different Tessar lenses give different results. This I understood from experience. The Tessar 3.5/50 looks different from the 2.8/50, and the 4.5/40 looks different from both.

My 4.5/40 is a very sharp lens, it is really Leica-sharp (I can compare with my Elmarit 35mm), but I don't find it too contrasty.
Here's a sample of a snapshot, whole image then 100% crop:





Definitely not bad for an uncoated end of 40s-early 50s lens. Like I said, it gets close to my Elmarit-R 35 (but not in the corners)
-


PostPosted: Wed Jun 18, 2008 7:13 am    Post subject: Reply with quote
Hallo!

This red, pink, lila colours are not easy for the sensor to catch, I see here the borders of the sensor ability, I have the same experience with this flowers.

The lens is not the source, i mean.

The analog film was full of limits, the sensor is wonderfull against this, but this tawdriness in red is to strong, here are the limits

regards Peter


PostPosted: Wed Jun 18, 2008 7:21 am    Post subject: Reply with quote
Another from the 4.5/40, taken in difficult light situation:



two 100% crops:




PostPosted: Wed Jun 18, 2008 7:39 am    Post subject: Reply with quote
The Tessars are very sharp by their nature on cropped digital sensors. The 40/4.5 is even sharper.
It all comes down to subjects, I had the same problems as you shooting food with that lens when I was very close to the subject.
For wider shots is a lot better because in that occasion sharpness and microcontrast help to make your subject stand out.
If I need a softer output I use a Pancolar or a Biotar.
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