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Messages - tadeobiologo
« on: April 30, 2013, 02:14:26 PM »
neverminding the warning of 120+ days without reply on this post:
a photograph is an image generated by any light-sensitive media, be it photosensitive emulsion or digital image sensor.
A photograph gets a meaning if it can trigger the symbols present in your brain, previous photostimulation of your light-sensitive cells inside the eye (bottom of the retina). since symbols are generated and related one to another by personal experience, the sensations (and emotions) evoked by a picture are totally personal and subjective. one picture can be beautiful to me but crap to you depending on "what" moved on your brain.
i totally recommend Douglas R. Hofstadter´s book: I´m a Strange Loop
it´s wonderfully written and really makes you think
« on: April 25, 2013, 05:58:54 PM »
let´s not forget something: once you have some used equipment you start to get comfortable with it.
but it´s not only about being familiar with your gear, it´s also about the distress you´re getting when you walk on the streets carrying a fancy chunk of expensive technology.
i dare you just don´t walk the streets with your old´n trusty E-P1 the same way than with a brand new (or even used) $6000 Leica body+lens combo. you just can´t.
so you relax, enjoy the view, plan your shoots instead of looking every corner for bugglars capable of stealing your waaaaaay expensive toys.
« on: April 25, 2013, 05:42:59 PM »
looks really good!
« on: January 22, 2013, 07:22:14 PM »
Ok, just quick replying before reading the original source: what i see in the samples here is among the other things, some loss of contrast when the adaptor is used. guess can be fixed in post anyway. but the speed boost is awesome no doubt
« on: January 21, 2013, 09:25:38 AM »
Just a question: what do you exactly mean when you say your 20mm lens is "slow"
is it slow because it gives you blurred shots?
is its slow because it gives you out of focus shots?
on ething i can tell you is this: f/1.7 is a FAST lens! but just in terms of exposure time.
can we see some pics which show us the kind of problem you have with the lens??
« on: January 17, 2013, 04:40:24 PM »
it´s like a sefety belt: saves lenses lifes!
« on: January 16, 2013, 08:13:43 PM »
The best demonstration will be the image samples you get with the adapter.
And respect to the bokeh claims, i dont know but my suposition is that bokeh is not going to be "potentiated" too. my guess is: if it gets sharper is because it reduces the area of the out of focus prjections on the sensor so "circles" cannot be discerned from "points" but anyway, somebody with some optics and lens design knowledge may enlighten us. aaaand, if you check the metabones release (white paper??) it clearly says that the MTF of the adapter is based on "perfect lens" so, it wasn´t tested but calculated. lets see how it behaves in real life.
« on: November 28, 2012, 11:46:13 AM »
Yep, i forgot to put it on the comments but it´s an OM mount and it´s adapted with a no-branded chinese OM to m4/3 mount adaptor.
i was doing some research online and seems to be a lens available on various mounts.
« on: November 25, 2012, 11:59:36 AM »
Sure! here they are:
it has a built-in hood but it´s kinda loose and not very useful.
i was thinking it may be a rebranded lens but i have no idea if this is the original brand or was manufactured by someone else.
« on: November 25, 2012, 11:09:02 AM »
it´s been a long time since my last visit but here i am again
Some time ago i was looking for some info about this lens Rexatar 135mm f/2.8 which i have no info about but was given to me as a bargain for about US $25
I have found this lens a bit strange with acceptable sharpness wide-open but not much better stopped down.
on the barrel it says "made in japan" thing that i consider as a good sign.
it has a strange green coating which looks quite nice.
Here are some samples i took with some extension tubes
it´s not a pin-sharp lens but gives a good "look" it is also not much contrasty but can be adjusted in LR.
« on: July 22, 2012, 10:12:23 PM »
this is a camera mostly for canon brainwashed fanboys
the real advantage on this camera is canon´s financial muscles driving advertising campaigns. c´mon! we already know how much quality we need in real-life situations and all current mirrorless systems gives the goods.
the sensor -size compromise is right there, just look at the 18-55 EF-M STM lens which is huge! i can´t see canon making a lens the (image)quality and speed of the oly 45mm f/1.8 for a nearly close price point.
we already have too the comparison for the 12mm f/2 beating FF with a 24mm L glass for a fraction the cost and weight.
but what sells on stores is heavily the brand name. customers go get informed at the time of the purchase and prefer blindly the C or the N word to real quality or advantages (wow, how grumpy i got :S LOL!)
« on: June 12, 2012, 12:05:46 AM »
I have used some canon rebels and digged deep on their menus and still think my E-P1 gives me more freedom to do what i want. the 14-42 kit lens is gorgeous to work with and i can adapt my OM zuikos.
the rebels have no direct mirror lock-up and the mirror shakes it all every single time.
and even funnier: pixel peeping the files i found more detail to my humble pen than the 18mp t2i with kitlenses.
or maybe i know how to use the pen but i´m stupid at the rebels ;P
but getting back to the new pancake: let´s wait for the image samples!
« on: May 23, 2012, 04:52:55 PM »
i don´t have the exact name but it´s a close relative of beans. it´s a leguminose.
« on: May 23, 2012, 04:50:05 PM »
How about a 4/3rds Zuiko 75-300 f/4? if size doesn´t matter, it´s not the most stellar lens but it´s less expensive and i assure you it´s sharp enough.
give it a tripod, a mirror lock-up and you are here. not that spontaneous, surely needs more planning but i dare it gives high quality results.
« on: May 22, 2012, 07:19:29 PM »
it´s just a great lens!
i got mine for around $60 and it´s pretty sharp at f/3.5
« on: May 03, 2012, 06:28:20 PM »
Remids me of that spongebob episode when patrick had a secret thing in a box he didn´t want to share with bob
« on: May 03, 2012, 06:22:58 PM »
i agree it´s a site with great potential and strangely the only one i really feel it´s not dominated by the phallocentric obsession "mine is bigger than yours" thing (regarding sensors, DR, IQ, mega-pixels) but instead people having fun taking pictures and sharing
« on: April 25, 2012, 10:08:21 PM »
The pen has a different look certainly but it produces wonderfull files. not a high iso camera but with the right lens gives you plenty of fine detail.
i have compared canon´s files of the 60D and the T3i with kitlenses and i can tell you i was not satisfied. even the little mZuiko 14-42mm f/3.5-5.6 version 1 is really sharp even wide open when compared with canon kitlenses (which suck).
« on: April 25, 2012, 09:53:58 PM »
I used to sell cameras for olympus mexico at a department store and i used the exhibition E-PL1 quite a lot. it´s a sturdy camera on which you can trust.
this cam i mentioned above was used intensively for demonstration but i also played and learned a lot from it. i swapped lenses all the time with the pannys, done many reverse-lens macros and showed the sensor to clients and never get dust issues on the sensor. i also used almost every option on the menu on the camera and it does manual video which te ep1 doesn´t.
at this price point is a gift i tell you!
« on: April 25, 2012, 09:47:22 PM »
I still have mine and use it as my main camera.
the lovely pen produces excellent quality files and recently i have received an OM to M4/3 adapter ring.
not so long ago i started using a little more film with a Canonet QL17 GIII and i love the look of the lens but now that i have the adapter i´ll be using my 50mm f/1.4 zuiko and 135mm f/3.5 zuiko.
« on: April 06, 2012, 11:13:30 PM »
let´s be the first replier!
IMHO it´s because they work just fine, you can get great quality pictures, can get good quality RAW files for editing and you can use a lot of comparably low costed vintage lenses and accesories.
i can use my pen as a studio camera or as a walkaround camera and it gets me the pictures. a good balance of trade-offs
« on: March 21, 2012, 07:52:20 PM »
I haven´t used (even seen) the X pro1 but i have seen the work that can be made with Leica glass and i can tell you it´s mindblowing. on 35mm the leica is razor-sharp and you are able to get huge prints with tons of fine detail.
the usability factor seems to be on the leica side for some aplications too, such as manual focusing and access to main controls.
in the end, good design remains. for example: dragonfly design is older than dinosaurs (by many many million years) but is that much damn good as to be still kings of the air
« on: March 21, 2012, 07:41:44 PM »
Good glass is expensive on any system.
i can see really how good m43 is due to price, glass options, image quality and the handling of the camera bodies.
each tool for a purpose and altough any camera is great in ones hands, there are better cameras for some jobs.
that new expensive nikon can do marvels but there are things it cannot do.
and for real-life detail nothing like large format cameras which in turn have no-pixels... or in the end is the photographer???
my E-P1 is no NIKON D4 but takes beautiful pictures
« on: March 21, 2012, 07:27:51 PM »
That would mean no-interpolation as needed for color capture which means: more per-pixel sharpness. that would also mean more sensitivity to light due to non color filter blocking. and also you can add some pixel binning for extra low-light sensitivity.
if true that´s gonna be an awesome camera with no need to go to über high pixel count to get REAL sharpness and detail (yes, D800)
« on: March 15, 2012, 09:58:32 AM »
The thing may be not that easy.
f-stops are an approximate of the light transmission ability of a lens.
lenses with the same f-stop may transmit approximately the same amount of light to the film/sensor plane per time-unit.
there are other factors to consider like, for example, how much light is absorbed by the lens elements, how much light gets scattered or reflected and in the end, always happens that less light hits the sensor/film than the light entering the lens.
a more accurate measure is the T-stop which tells you how much light will be transmitted from a lens.
so, two lenses with the same f-stop may not have the same t-stop and the exposure required for each may vary.
but in general the explanation is OK and is useful. my blahbing is just a technical disclaimer