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Forum: Pentax SLR Lens Discussion 04-30-2009, 02:53 AM  
Tamron 70-200 f/2.8 first test shots
Posted By gkopeliadis
Replies: 148
Views: 55,309
Ouch... :o
Forum: Pentax SLR Lens Discussion 03-19-2009, 03:57 AM  
Zooms and you
Posted By gkopeliadis
Replies: 30
Views: 3,915
Checking Lightroom I find that I use both my zooms through their range.
Forum: Pentax SLR Lens Discussion 03-17-2009, 03:37 AM  
Does UV-filter helps to cut down the purple fringing?
Posted By gkopeliadis
Replies: 20
Views: 18,045
At least a portion of PF is credited to the image sensor. When overenergetic UV photons strike the photocells they force some electrons to leak out to neighboring cells causing the effect.
So a UV filter can reduce this phenomenon under harsh daylight or fluoresent lamps (rich in UV)
Forum: Pentax SLR Lens Discussion 03-04-2009, 10:07 AM  
Anyone have problems with tamron 70-200?
Posted By gkopeliadis
Replies: 5
Views: 2,061
It seems to me that the second picture is out of focus.... Conditions of taking the photograph?
I own this lens (TAMRON AF70-200mm F/2.8 Di LD (IF) Macro) and Nothing of the sort has ever come up.
Forum: Pentax SLR Lens Discussion 03-04-2009, 08:03 AM  
am i nuts?
Posted By gkopeliadis
Replies: 20
Views: 3,511
Who could live without zooms? :confused:
Forum: Pentax SLR Lens Discussion 02-27-2009, 02:29 AM  
DA* 50-135mm vs Tamron 70-200mm Comparison and Shootout
Posted By gkopeliadis
Replies: 35
Views: 9,376
I think that Tamron focuses faster because it's focusing mechanism needs fewer degrees of turn per object to lens distance change than the Pentax 50-135. I could say that it has lower focus “resolution”. The price is that at great object to lens distance and wide diaphragm (shallow Depth of Field) there is always an uncertainty of precise focusing (it needs miniscule motor steps). I tend to shoot about 5 subsequent frames to get one focus correctly.
The 200 vs. 135 mm focal length just make things touchier.
Despite this, I choose the Tamron over the Pentax because of the extra reach and the way better CA and flare resistant behaviour.
Forum: Pentax SLR Lens Discussion 02-26-2009, 01:45 AM  
Transparent Pentax 35-70mm lens
Posted By gkopeliadis
Replies: 18
Views: 5,633
Or totaly transparent.... Just wait the Transparent Aluminum formula Scoty gave to to us in order to save the whales :lol:
Forum: Pentax SLR Lens Discussion 02-24-2009, 02:58 AM  
need 70-200
Posted By gkopeliadis
Replies: 16
Views: 2,344
I have to take heliphoto 's side on this one... I you don't pixel peep you can’t judge the sharpness of a lens. You can judge a million other things, but can’t truly compare two lenses.
Downsized images from my 100€ Casio look as good as those from my K10 and DA 40mm /2.8 Limited :lol:
Forum: Pentax SLR Lens Discussion 02-23-2009, 01:39 AM  
My brand new TAMRON AF70-200mm F/2.8 Di LD (IF) Macro
Posted By gkopeliadis
Replies: 4
Views: 3,449
Sorry :( I cann't deliver the promised photographs due to extremely bad weather during this weekend.
Forum: Pentax SLR Lens Discussion 02-20-2009, 08:01 AM  
My brand new TAMRON AF70-200mm F/2.8 Di LD (IF) Macro
Posted By gkopeliadis
Replies: 4
Views: 3,449
The lens arrived 2 weeks ago but couldn't make much use of it for most of the time.
Preliminary findings:
Slight misfocusing tendency obvious at f2.8-4 when focusing to far away objects. I think that this is because of the very-very small step necessary to focus from 10m to infinity (the motor just "ticks" for that)
Very good macro
Excellent resolution and minimal CA.
I'll post photos as I take them.
For now there is a quick and dirty macro photograph with a 100% crop.
Hand held, f11, 1/125sec, ISO 400, K10
Taken in raw, no post processing, just export to jpeg with Lightroom 1.4

On the weekend I intend to confirm the misfocusing problem with controlled conditions and the camera on tripod.
Maybe I'll do some nature macro work also.


Forum: Pentax SLR Lens Discussion 02-13-2009, 08:12 AM  
an example of why the 50-135* doesn't suck
Posted By gkopeliadis
Replies: 214
Views: 36,290
I can see that you are a very good photographer. But for the lens, I would like to see the original files :hmm: :)
Forum: Pentax SLR Lens Discussion 02-11-2009, 08:35 AM  
Rumors on Tamron 10-24 availability?
Posted By gkopeliadis
Replies: 18
Views: 3,508
Quality Control problem (Go to thread).
Lucky I quess.
Forum: Pentax SLR Lens Discussion 02-11-2009, 04:54 AM  
Rumors on Tamron 10-24 availability?
Posted By gkopeliadis
Replies: 18
Views: 3,508
After reading this and my unfortunate afair with the Pentax wide zoom, I think Sigma 10-20mm F4-5.6 EX DC HSM remains at the top of my wish list even at 3 times the price of Tamron :hmm:
Forum: Pentax SLR Lens Discussion 02-11-2009, 03:17 AM  
Rumors on Tamron 10-24 availability?
Posted By gkopeliadis
Replies: 18
Views: 3,508
You lucky guy .... My two copies were all crap:mad:
Forum: Pentax SLR Lens Discussion 02-05-2009, 04:35 AM  
70-200/2.8 lenses - novice needing advice
Posted By gkopeliadis
Replies: 21
Views: 4,002
Where are these weddings going to take place? At a football stadium? ;)
Forum: Pentax SLR Lens Discussion 02-04-2009, 05:58 AM  
shy Tamron SP AF70-200mm F/2.8 Di LD (IF) Macro
Posted By gkopeliadis
Replies: 7
Views: 2,648
Still in Europe Adobe wants 125€ to upgrade from Lightroom 1.4 to 2 :mad:
Forum: Pentax SLR Lens Discussion 02-04-2009, 02:12 AM  
shy Tamron SP AF70-200mm F/2.8 Di LD (IF) Macro
Posted By gkopeliadis
Replies: 7
Views: 2,648
I use Lightroom v1.4 allright. Any workaround? I use my photographs sorted by lens many times ...
Forum: Pentax SLR Lens Discussion 02-03-2009, 08:05 AM  
shy Tamron SP AF70-200mm F/2.8 Di LD (IF) Macro
Posted By gkopeliadis
Replies: 7
Views: 2,648
My new Tamron SP AF70-200mm F/2.8 Di LD (IF) on my K10 is too shy to show up a name in the EXIF. Is it normal for this lens?
Forum: Pentax SLR Lens Discussion 01-28-2009, 06:59 AM  
DA* 16-50mm f2.8 positive props from a Canon user
Posted By gkopeliadis
Replies: 7
Views: 1,548
fun to read and absolutly worthless I'd say :hmm:
Forum: Pentax SLR Lens Discussion 01-19-2009, 02:32 AM  
Poll: Lens setup if you had not a single lens
Posted By gkopeliadis
Replies: 55
Views: 8,578
I like to shoot player's face and body expresions. In the water polo case the subject is smaller, it's head and shoulders instead of the whole body. So statisticaly I use the 70 - 200mm range way more than shorter focal lengths. For basketball and volleyball what you say is true more or less. But I cann't afford both lenses right now.
When I shoot football I borrow my friend's DA 50-200 lens
Forum: Pentax SLR Lens Discussion 01-16-2009, 01:45 AM  
Poll: Lens setup if you had not a single lens
Posted By gkopeliadis
Replies: 55
Views: 8,578
The thing I need is an 70-200, f2,8 because I shoot Indoors sports (basketball, water polo) and the light is poor in there at night.
but for travelling 55-300 is a good choice.
Forum: Pentax SLR Lens Discussion 01-15-2009, 08:10 AM  
Transparent Pentax 35-70mm lens
Posted By gkopeliadis
Replies: 18
Views: 5,633
Transparent (working) camera ?
Not physicaly possible (in this universe anyway ;))
Forum: Pentax SLR Lens Discussion 01-15-2009, 08:03 AM  
Poll: Lens setup if you had not a single lens
Posted By gkopeliadis
Replies: 55
Views: 8,578
It would be Spiderman and Hulk :hmm:
Forum: Pentax SLR Lens Discussion 01-15-2009, 08:02 AM  
Poll: Lens setup if you had not a single lens
Posted By gkopeliadis
Replies: 55
Views: 8,578
Why? They are so much fun :) I like them and they help me...
Forum: Pentax SLR Lens Discussion 01-13-2009, 05:22 AM  
Your biggest surprise lens of 2008
Posted By gkopeliadis
Replies: 28
Views: 6,358
:eek:

don't take me wrong ... it's so rare!
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