Lives in Spain Madrid, Spain
Works as a Teacher
Has a website at http://www.rgtti.com/
Joined on Dec 13, 2010


Total: 134, showing: 1 – 20
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In reply to:

mustafa604: How do you get the sky to look green like that? in 1st photo

? It's an aurora....

Direct link | Posted on Mar 11, 2015 at 21:48 UTC
On Eiffel Tower in the Zooming While Exposing challenge (3 comments in total)

Great photo. Congrats!

Direct link | Posted on Jan 23, 2015 at 19:44 UTC as 3rd comment
On Tamron23-ISO-640-150mm photo in dpreview review samples's photo gallery (2 comments in total)

this is a nice shot!

Direct link | Posted on Jan 17, 2015 at 16:10 UTC as 1st comment | 1 reply
On Tamron SP 150-600mm F/5-6.3 Di VC USD Lab Test Review preview (246 comments in total)
In reply to:

Kevin Sutton: How can it be sharp at 600mm on FF but less sharp on APS-C?

I think that Imatest really tests the pair lens+camera. So if you test with a camera with larger photosites, the lens seems sharper. There are very interesting articles on LensRental.com about that (they have acquired an "absolute" lens tester... I hope Roger Cicala will soon or later post something comparing the same lens on different cameras and on the tester).

Direct link | Posted on Jun 25, 2014 at 21:57 UTC
On Sony Cyber-shot DSC-RX100 III Review preview (830 comments in total)
In reply to:

Manah: This review is FRUSTRATING and unprofessional.A camera whose lens is too short to be used to take portrait shots should not be on the market and really - should not even be reviewed.

Hmm... sarcasm? (cit. Dr. Sheldon Cooper)

Direct link | Posted on Jun 23, 2014 at 17:34 UTC

All great photos --- my favorite is #8. A pity is reserved to only US residents - I probably had no chances, but I would have liked to participate...

Direct link | Posted on May 26, 2014 at 05:13 UTC as 7th comment
In reply to:

G3User: I agree, number 3 is a Photoshop fail. What I have noticed with recent competitions is that there is a trend towards using untrained judges. The judges here look like they man the gates taking tickets from visitors. Anyone with a half photography wit would not have chosen this one or they should have asked to see the raw file (if they know what a raw file is). Again, another example of the demise of photography, using just any soccer mom to be a judge is a joke and a discredit to the other honest photographers in this competition. Another Photoshop fail is in the first image, the boat to the right and to the distance looks totally fake.

Great shot - shows how the idea and the vision is important. Both for who can see the image, and for who is just able to whine...

Direct link | Posted on May 26, 2014 at 05:07 UTC
On Hollow Home in the Naturally Hollow challenge (6 comments in total)

Congrats. Wonderful photo.

Direct link | Posted on Apr 26, 2014 at 04:19 UTC as 4th comment
On Cepheus IC1396, Elephant Trunk Nebula in the Other Worlds - Nebulae challenge (2 comments in total)

This was my favourite --- wonderful color and detail. Congratulations!

Direct link | Posted on Apr 1, 2014 at 19:24 UTC as 2nd comment
In reply to:

forpetessake: As far as I remember this patent was discussed more than a year ago. Finally it got into production.
Though Sigma says it won't affect resolution, it will. The most sensitive color when it comes to determining resolution is green, but the sensor has quad blue layer. Though every layer in Foveon sensor is sensitive to the whole spectrum, the absorption is different. The thin blue layer with quad pixels won't make much difference in real life, the performance will be very similar to the 3 layer 4.9M dot design, except for strong contrast BW test charts.

I concord; while I can understand the original foveon idea (same color resolution than luminance, 4:4:4) this will simply be another variation of the Bayer pattern. So the correct question is... why? We'll see the result, but what is probably doing Sigma here is trading color resolution for ISO performances. Which IMHO is killing the difference factor they have with the Foveon sensors.

Direct link | Posted on Feb 10, 2014 at 19:57 UTC
On Bath in the Fisheye - Portrait (non-circular) challenge (12 comments in total)
In reply to:

wolfytom: I don't get it? Why deform a pretty girl's face?
Surely the use of any 'extra' should add to the pic, not diminish it?

This is basically s photo of a pretty little girl, what does the fish eye add?

Fun, surprise, originality, vision, happiness... My 8 years old burst in laugh at seeing this yelling "how cute!". I concord.

Direct link | Posted on Feb 9, 2014 at 05:33 UTC
On My Best Photo Challenge#1: MACROPHOTOGRAPHY challenge (6 comments in total)

...what about snowflakes? :-) ... hope for another (inanimate) macro challenge!

Direct link | Posted on Feb 8, 2014 at 23:52 UTC as 3rd comment | 1 reply
On Bath in the Fisheye - Portrait (non-circular) challenge (12 comments in total)

Great great great! Congrats!

Direct link | Posted on Feb 8, 2014 at 23:45 UTC as 4th comment
In reply to:

digiart: Pentax alternative to AA filter removal is a very promising solution. It deserves a detailed review by DPR soon.

AA bracketing will be very useful. But I wonder if one day the camera will be able to analyze the image taken and warn the photographer that moiré is present or very likely, or even activate the AA filter simulator automatically and take another image immediately. That would be the ideal solution. That is one complicated thing to do. But, with image processors getting more powerful everyday, who knows if in a few years that will be possible.

The problem with aliasing is that the artifacts are impossible to be set apart from real data. (Nyquist's theorem). When you see moiré you know it's an artifact because... You have seen the original. If you shoot a photo to a subject with really has the colored pattern (I have seen "joke" neckties with it) there will be no clue in the data that this is real and not an artifact. So no, the only way to detect aliasing would be to shoot in parallel an image with much more resolution AND an AA filter... ;-)

Direct link | Posted on Feb 6, 2014 at 05:32 UTC
On Sony a7R teardown! Roger Cicala gets his hands dirty article (135 comments in total)
In reply to:

B1ackhat: How much does Cicala pay to get his advertisements disguised as articles posted here? I'm just curious.

Sorry you feel like that. I think that Roger Cicala's blog entries are among the most interesting, well documented, objective and instructive posts you could find in the photo-web. Without mentioning fun and well written. So I for one would kindly ask to DPR to continue to refer to them.

Direct link | Posted on Jan 31, 2014 at 04:01 UTC
On Wyoming's stunning weather and landscapes in time-lapse article (231 comments in total)
In reply to:

Mattoid: I think the music sucks. I muted. Its not worthy to go along with a video that took so much effort.

I really disagree. Matter of tastes, I suppose.

Direct link | Posted on Jan 29, 2014 at 15:31 UTC

Just wondering why no one never proposed a Bayer pattern with a clear spot instead of one of the greens. A mix of a normal sensor and a Leica MM... should be good for color at low ISO and for BW in low light...
Will ask in photography SE...

Direct link | Posted on Jan 25, 2014 at 05:52 UTC as 14th comment | 2 replies
On Ricoh GR firmware version 3.00 now available article (20 comments in total)

This is one of the reasons my next camera will be, if I can afford it, a Ricoh/Pentax. Sony stopped supporting my A55 the next day after starting to sell the next camera. I will vote with my wallet as soon as I can.

Direct link | Posted on Jan 25, 2014 at 05:35 UTC as 12th comment
On Using third-party lenses on Sony Cyber-shot a7 / a7R article (503 comments in total)
In reply to:

Bryan Costin: Apparently it's a bloomin' miracle anybody ever took a picture that was properly focused with a manual-focus lens.

I had a manual focus reflex in the 80s... and there is no comparison on how easy was to focus on the "split prism" OVF than with modern cameras. Even the ones with OVF now have views optimized for different things than focus, and you can notice it quite well. EVF and manual focusing without a tripod is quite hellish.

Direct link | Posted on Jan 24, 2014 at 00:19 UTC
In reply to:

nekrosoft13: post RAW samples, not this JPG crap.

Well, with the modern level of technology most of the time is the photographer that makes images crap, I fear...

Direct link | Posted on Jan 15, 2014 at 04:45 UTC
Total: 134, showing: 1 – 20
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