Camaras Digitales Online Las Ultimas novedades en Camaras digitales.

18Dic/1168

Sigla de Objetivos

Para tener una referencia acerca de las distintas siglas de los objetivos como guía fundamental para entender y conocer el amplio mundo de los lentes y objetivos de la fotografía.

Sigma ASP / Tamron ASL y XR* (Aspherical Lens / Extra Refractive Index Glass). Comúnmente las lentes se fabrican de forma esférica, es decir, con un radio de curvatura fijo; sin embargo, cuando se utilizan diafragmas muy abiertos, estos dan lugar a aberraciones ópticas en las zonas por las que la luz pasa más próxima a los bordes de la lente. Para evitarlo, se crearon las lentes asféricas, que consisten en una o varias lentes situadas de forma estratégica y en cuyos bordes la curvatura es distinta. Además, por su diseño, permiten la fabricación de objetivos con menos componentes y tamaños más reducidos.

Canon Hi-UD / Nikon ED / Sigma APO / Tamron LD (Ultra Low Dispersion / Extra-Low Dispersion / Apochromatic / Low Dispersion). Son objetivos construidos utilizando cristales especiales de baja dispersión (SLD) diseñados para minimizar las aberraciones de color que se suelen hacer patentes en los teleobjetivos. Al pasar a través de un cristal normal (una lente acromática), la luz sufre una dispersión diferente para cada longitud de onda, siendo el color rojo y el azul desviados de forma distinta. Aunque en algunos objetivos con lentes acromáticas se utilizan otras lentes para volver a desviar los rayos de luz dispersos, los que utilizan lentes apocromáticas evitan total o casi totalmente esta desviación desde el principio, obteniendo mejores resultados (y por lógica, resultando más caros).

Canon DO
 (Diffractive Optical). Si la refracción es el cambio de dirección que experimentan las ondas al pasar oblicuamente de un medio a otro en el que se propagan con diferente velocidad, la difracción es un fenómeno en virtud del cual un sistema de ondas que atraviesa un obstáculo por un orificio pequeño se propaga en todas direcciones detrás de dicho orificio. Pues bien, tras esta pequeña clase de física que he copiado y pegado de caborian, tan solo decir que los objetivos DO, es decir, los que poseen elementos ópticos difractivos, son sustancialmente más cortos y ligeros (esto último no tanto) que cualquier otra lente de su misma focal.

Canon IS / Nikon VR / Sigma OS (Image Stabilizer / Vibration Reduction / Optical Stabilizer). Sistema estabilizador mediante el que el objetivo detecta la fuerza y dirección de las vibraciones de la cámara, desplazando algunos de sus elementos ópticos internos en dirección opuesta. Mediante este sistema desarrollado originalmente por Canon, se logra obtener una imagen nítida disparando incluso a bajas velocidades (dependiendo de la generación del estabilizador podemos llegar a dispara a velocidades de hasta tres pasos por debajo de lo habitual sin riesgo de trepidaciones). Normalmente, disponen de dos modos seleccionables desde el propio cuerpo del objetivo: el primero controla los movimientos verticales y horizontales mientras que el segundo solo corrige los verticales y sirve para hacer paneos.

Sigma DG / Tamron DI 
(Objetivos Optimizados para Digital). Este distintivo se suele ver principalmente en angulares y teleobjetivos muy luminosos y que permiten el enfoque a distancias mínimas. Indica que pese a que los objetivos que lo llevan pueden utilizarse con cualquier réflex de 35mm, son especialmente recomendables para los modelos digitales ya que mejoran la distribución de la luz desde el centro de la imagen a los bordes, especialmente a máxima abertura del diafragma.

Canon EF-S / Nikon DX / Sigma DC / Tamron Di-II (Objetivos Diseñados para Digital). Son objetivos diseñados exclusivamente para el círculo de imagen de los sensores de tamaño APS-C (sensores de 22mm × 15mm aprox. presentes en la mayoría de réflex digitales), por lo que no pueden utilizarse con las clásicas réflex de película o los modelos digitales profesionales fullframe (cuyos sensores/película son de 24mm × 36mm). Al ser el círculo de imagen de un tamaño menor, los objetivos pueden ser más compactos y ligeros, siendo más sencillo y barato fabricar gran angulares. Aunque será tema para otro artículo, todo parece indicar que el mercado está evolucionando poco a poco hacia los sensores fullframe por lo que invertir en este tipo de objetivos no es una opción demasiado recomendable a largo plazo.

Canon L / Sigma EX. Distintivos de calidad con los que se indica que el objetivo está construido utilizando materiales y procedimientos que aseguran su máxima calidad física, resistencia, y rendimiento óptico. Como es lógico, suelen ir acompañados de un curioso incremento en el precio. 

Canon USM / Nikon SWM / Sigma HSM (Ultra Sonic Motor / Silent Wave Motor / Hyper-Sonic Motor). Estos objetivos utilizan un motor que transforma la oscilación de ondas ultrasónicas en movimientos lineales o rotacionales, siendo un sistema de enfoque muy rápido y silencioso.

Canon I/R / Nikon, Sigma o Tamron IF (Internal / Inner Focus). Para asegurar la estabilidad del enfoque, estos objetivos mueven los grupos de lentes de forma interna sin que se modifiquen las dimensiones físicas del objetivo.

Canon I/R / Sigma RF* (Rear Focus). Sistema que mueve al enfocar tan solo un pequeño grupo de lentes situado en la base del objetivo, lo que hace que sea más rápido y silencioso.

Sigma DF* (Dual Focus). Sistema mediante en cual el anillo de enfoque manual permanece inmóvil aunque se esté utilizando el enfoque automático. De esta forma, sujetar el objetivo suele ser más cómodo, así como controlar el propio enfoque manual.

Nikon DC (Defocus Control). Objetivos con la habilidad de controlar que zonas están dentro o fuera de foco, estando especialmente recomendados para retratos.

Nikon AF-S y AF-C* Se refieren al Modo AF Servo Unico con prioridad de enfoque y modo AF Servo Continuo con prioridad de disparo, respectivamente. Con el modo AF-S el obturador no se disparará hasta que el sistema de detección de enfoque determine que el enfoque es correcto en el momento de la exposición. Con el modo AF-C, el obturador se disparará en cuanto se presione el botón del disparador.

¿Te gustó este artículo?

¡Suscríbete a nuestro feed RSS!

Comentarios (68) Trackbacks (0)
  1. buy xanax online prescription drug abuse xanax – generic name xanax bars

  2. I just want to tell you that I am all new to blogging and actually enjoyed your website. Probably I’m likely to bookmark your blog . You definitely come with excellent articles. Kudos for sharing your web page.

  3. What’s Happening i am new to this, I stumbled upon this
    I have found It positively useful and it has helped me out loads.
    I am hoping to give a contribution & help other customers like its helped
    me. Great job.

  4. I don’t even understand how I ended up right here, but I thought this put
    up was once good. I don’t recognise who you might be however definitely you’re going to a famous blogger if
    you happen to are not already. Cheers!

  5. Write more, thats all I have to say. Literally, it seems
    as though you relied on the video to make your point. You obviously know what youre talking about, why
    throw away your intelligence on just posting videos to your weblog when you could be giving us something enlightening
    to read?

  6. Hello my loved one! I wish to say that this post is awesome, nice written and come
    with approximately all significant infos. I would like to
    peer more posts like this .

  7. Very good info. Lucky me I found your site by
    chance (stumbleupon). I’ve book marked it for later!

  8. What’s up to every body, it’s my first visit of this web site; this web site
    consists of remarkable and genuinely excellent data in favor of readers.

  9. I’m not sure why but this web site is loading very slow for me. Is anyone else having this issue or is it a problem on my end? I’ll check back later on and see if the problem still exists.|

  10. Fantastic beat ! I wish to apprentice whilst you amend your website, how can i subscribe for a weblog website? The account helped me a applicable deal. I were tiny bit acquainted of this your broadcast offered bright transparent idea|

  11. Wow! After all I got a webpage from where I be capable of in fact get valuable data regarding
    my study and knowledge.

  12. I visited several websites however the audio quality for audio songs present at this site is actually marvelous.

  13. Your style is unique compared to other folks I have
    read stuff from. Thanks for posting when you have the
    opportunity, Guess I’ll just book mark this page.

  14. Hi, Neat post. There’s a problem along with your web site in web
    explorer, could test this? IE still is the market leader
    and a huge component of folks will leave out your fantastic writing due to this problem.

  15. Thanks on your marvelous posting! I truly enjoyed reading it, you’re
    a great author. I will ensure that I bookmark your blog and
    may come back later in life. I want to encourage continue your great posts, have
    a nice weekend!

  16. Hey! I know this is kinda off topic but I’d figured I’d ask.

    Would you be interested in trading links or maybe guest authoring a blog post or vice-versa?
    My website covers a lot of the same subjects as yours and
    I believe we could greatly benefit from each other.
    If you happen to be interested feel free to shoot me an email.

    I look forward to hearing from you! Terrific blog by the way!

  17. I simply want to mention I’m all new to blogging and site-building and actually enjoyed this web blog. Very likely I’m want to bookmark your blog . You absolutely have beneficial posts. Many thanks for revealing your blog.

  18. Hello it’s me, I am also visiting this web site daily, this web page is in fact nice and
    the people are genuinely sharing nice thoughts.

  19. Having read this I thought it was very enlightening.
    I appreciate you spending some time and effort to put this informative
    article together. I once again find myself spending way too much time both reading and posting comments.
    But so what, it was still worthwhile!

  20. Hi, everything is going nicely here and ofcourse every one is sharing information, that’s actually good, keep up writing.

  21. Hey there! I know this is kinda off topic but I was wondering if
    you knew where I could locate a captcha plugin for my comment form?

    I’m using the same blog platform as yours and I’m having problems
    finding one? Thanks a lot!

  22. Quite comfortable. My child is actually no more complaining regarding her mattress being actually annoying or lumpy.

  23. My spouse and I required a comfy bed to rest on when visiting and also got these bed mattress for a frame he was actually creating them.

  24. I feel that is one of the most important info for me. And i am
    happy studying your article. But wanna observation on some
    normal issues, The site style is perfect, the articles is in reality
    nice : D. Good task, cheers

  25. Wow thanks for this publish i find it hard to come up withgoodimportant information out there when it comes to this subject materialappreciate for the post

  26. When put together as a whole bedroom, my partner as well as I slept really effectively on these cushions; incredibly comfy and king dimension.

  27. Outstanding story there. What occurred after? Take care!

  28. Usually I don’t learn post on blogs, but I would like to say that this write-up very compelled me to try and do so! Your writing style has been surprised me. Thanks, very nice post.

  29. You can certainly see your expertise in the work you write. The sector hopes for more passionate writers like you who are not afraid to say how they believe. At all times follow your heart.

  30. Wonderful work! This is the type of information that should be shared around the web. Disgrace on the search engines for no longer positioning this submit upper! Come on over and seek advice from my website . Thanks =)

  31. I get pleasure from, lead to I discovered exactly what I used to be looking for. You have ended my 4 day long hunt! God Bless you man. Have a nice day. Bye

  32. Wow, incredible blog layout! How long have you been blogging for? you made blogging look easy. The overall look of your site is excellent, as well as the content!

  33. I’m not sure where you are getting your info, but great topic. I needs to spend some time learning more or understanding more. Thanks for great information I was looking for this information for my mission.

  34. Heya i am for the first time here. I came across this board and I find It really useful & it helped me out a lot. I hope to give something back and aid others like you helped me.

  35. Every person in our loved ones is astounded that a mattress that showed up in a roll with the sky pulled from it might be such a nice mattress, but this definitely is.

  36. Really comfortable. My little girl is actually not fussing regarding her mattress being annoying or even misshapen.

  37. Hello there, You have done a fantastic job. I’ll definitely digg it and personally suggest to my friends. I’m sure they’ll be benefited from this web site.

  38. Excellent beat ! I wish to apprentice while you amend your site, how could i subscribe for a blog website? The account helped me a acceptable deal. I had been a little bit acquainted of this your broadcast provided bright clear idea

  39. Hi there, just became alert to your blog through Google, and found that it is truly informative. I’m gonna watch out for brussels. I will be grateful if you continue this in future. Numerous people will be benefited from your writing. Cheers!

  40. Just want to say your article is as astonishing. The clarity in your post is just excellent and i could assume you are an expert on this subject. Fine with your permission let me to grab your feed to keep updated with forthcoming post. Thanks a million and please continue the rewarding work.

  41. Excellent weblog here! Also your website quite a bit up fast! What web host are you using? Can I get your affiliate hyperlink on your host? I wish my site loaded up as fast as yours lol

  42. Hello.This article was extremely remarkable, particularly since I was investigating for thoughts on this matter last Monday.

  43. Somebody essentially lend a hand to make severely posts I would state. That is the very first time I frequented your web page and so far? I amazed with the analysis you made to create this particular post incredible. Great task!

  44. Thank you for the sensible critique. Me and my neighbor were just preparing to do a little research on this. We got a grab a book from our local library but I think I learned more clear from this post. I am very glad to see such fantastic information being shared freely out there.

  45. Have you ever thought about adding a little bit more than just your articles?

    I mean, what you say is valuable and all. But
    think of if you added some great images or videos to give your posts more, “pop”!
    Your content is excellent but with pics and video clips, this site could undeniably
    be one of the most beneficial in its field. Superb blog!

  46. It’s awesome to visit this site and reading the
    views of all friends on the topic of this post, while I am also zealous of getting experience.

  47. This is very fascinating, You are an overly professional
    blogger. I have joined your rss feed and stay up for in search of more of your fantastic post.
    Also, I have shared your web site in my social networks

  48. Hello, of course this piece of writing is truly good and I have learned lot of things from it concerning
    blogging. thanks.

  49. Its like you read my mind! You appear to know a lot about this, like you wrote the book in it or something. I think that you could do with a few pics to drive the message home a little bit, but instead of that, this is excellent blog. A fantastic read. I’ll certainly be back.

  50. magnificent points altogether, you just received a new reader. What could you recommend in regards to your publish that you just made some days in the past? Any sure?

  51. I was actually a little bit of concerned to find how that was actually packaged but that simply had few seconds in order to get to dimension and is actually exceptionally pleasant. I would get this mattress once more.

  52. Very nice info and straight to the point. I am not sure if this is actually the best place to ask but do you folks have any ideea where to hire some professional writers? Thx 🙂

  53. Thanks for another informative web site. The place else may I am getting that type of information written in such an ideal manner? I have a challenge that I am just now working on, and I’ve been at the glance out for such info.

  54. I think this is one of the most vital information for me. And i’m glad reading your article. But should remark on some general things, The site style is ideal, the articles is really nice : D. Good job, cheers

  55. It’s an remarkable piece of writing in favor of all the web visitors; they will take
    benefit from it I am sure.

  56. Good ¡V I should definitely pronounce, impressed with your web site. I had no trouble navigating through all the tabs and related info ended up being truly easy to do to access. I recently found what I hoped for before you know it at all. Reasonably unusual. Is likely to appreciate it for those who add forums or something, website theme . a tones way for your client to communicate. Nice task..

  57. I am very happy to read this. This is the kind of manual that needs to be given and not the accidental misinformation that’s at the other blogs. Appreciate your sharing this greatest doc.

  58. That is a good tip particularly to those fresh to the blogosphere.
    Short but very accurate information… Thanks for sharing
    this one. A must read post!

  59. Hello would you mind sharing which blog platform you’re working with?
    I’m looking to start my own blog soon but I’m having a difficult time deciding between BlogEngine/Wordpress/B2evolution and
    Drupal. The reason I ask is because your design seems different then most blogs and I’m looking for something unique.

    P.S Sorry for getting off-topic but I had to ask!

  60. It is the best time to make some plans for the longer term and it is time to be happy.
    I’ve learn this put up and if I may just I want to recommend you
    few interesting things or advice. Maybe you could write
    subsequent articles referring to this article. I want to read even more
    issues about it!

  61. hey there and thank you for your information – I have certainly picked up anything new from right here. I did however expertise several technical points using this web site, since I experienced to reload the website a lot of times previous to I could get it to load correctly. I had been wondering if your web hosting is OK? Not that I’m complaining, but slow loading instances times will sometimes affect your placement in google and can damage your high-quality score if ads and marketing with Adwords. Well I am adding this RSS to my email and could look out for a lot more of your respective intriguing content. Ensure that you update this again very soon..

  62. Great amazing issues here. I¡¦m very satisfied to look your article. Thanks a lot and i am having a look forward to touch you. Will you please drop me a e-mail?

  63. This is really fascinating, You’re an excessively skilled blogger.
    I have joined your feed and look ahead to in the hunt for extra of your fantastic
    post. Also, I’ve shared your site in my social
    networks

  64. I was recommended this web site by my cousin. I am not sure whether this post is written by him as nobody else know such detailed about my trouble. You’re wonderful! Thanks!

  65. It’s a pity you don’t have a donate button! I’d certainly
    donate to this superb blog! I suppose for now i’ll settle
    for book-marking and adding your RSS feed to my Google account.
    I look forward to new updates and will talk about this blog with my
    Facebook group. Talk soon!

  66. Of course, what a fantastic website and revealing posts, I will bookmark your site.Best Regards!

  67. It is actually a nice and helpful piece of
    info. I’m happy that you just shared this useful info with us.
    Please stay us informed like this. Thank you for sharing.


Leave a comment

Aún no hay trackbacks.