domanda su Canon AE-1 a pellicola

[Rox85]

Salve a tutti questo e' il mio primo post qui'...mi chiamo Roberto!

mi sto avvicinando da qualche tempo alla fotografia reflex con appunto una canon ae-1.
cercavo qualcuno che la conoscesse e possa darmi una mano:

-l'esposizione e' corretta quando imposto lo stop-down?
-ho un obbiettivo vimitar 35/70mm c/fd che quando imposto lo stop-down non mi fa' variare in tempo reale il diaframma..perche'?
-per ultimo...volevo acquistare altri obiettivi per la ae-1 ma che appunto fossero compatibili con lo stop-down.quale sigla e marca devo prendere come riferimento?

grazie a tutti e scusate le domande molto "terra-terra"

[alaric_morgan]

Benvenuto.

Non so aiutarti nel caso specifico, ma in generale in stop-down dovrebbe mantenere la priorità del diaframma, quindi quello che riscontri credo sia il giusto comprtamento. In ogni caso aspettiamo e vediamo se qualche utente sa almeno metterti sulla buona strada.

Ciao
Al

[Darrol]

# You can lock the stop-down lever at the stopped-down position when you're set to a manual f/stop setting (Note: It can only be used at manual f stop settings). You can then use the FL lenses with stopped-down metering. Suppose that your diaphragm-setting ring is at "A" and you decide to use the depth-offield preview. You turn the diaphragm-setting ring to a manual setting and push in the stop-down lever. But before you return the diaphragm-setting ring to the "A" position, set the largest aperture. Otherwise, the camera won't program the aperture automatically.

fonte: http://www.mir.com.my/rb/photography...e1/ae1tech.htm

Da qualche parte ho il manuale della macchinetta, appena lo trovo ti posto le caratteristiche dello stop-down

[Darrol]

Originariamente inviato da Rox85
Salve a tutti questo e' il mio primo post qui'...mi chiamo Roberto!

mi sto avvicinando da qualche tempo alla fotografia reflex con appunto una canon ae-1.
cercavo qualcuno che la conoscesse e possa darmi una mano:

-l'esposizione e' corretta quando imposto lo stop-down?
-ho un obbiettivo vimitar 35/70mm c/fd che quando imposto lo stop-down non mi fa' variare in tempo reale il diaframma..perche'?
-per ultimo...volevo acquistare altri obiettivi per la ae-1 ma che appunto fossero compatibili con lo stop-down.quale sigla e marca devo prendere come riferimento?

grazie a tutti e scusate le domande molto "terra-terra"

Qua ho trovato un po di informazioni sulla funzione:http://www.mir.com.my/rb/photography...ae1/basic5.htm

Con lentti FD devi prima avanzare il rullino per poter variare il diaframma, altrimenti si blocca sull'ultima esposizione utilizzata.

Usando lenti FD con stop-down darà esposizione errata

Depth-of-Field (More info relating to this topic) When a certain subject is brought into focus, there is only a limited range in the foreground and background of the subject which can be kept clearly in focus. This zone of sharpness in the subject field is depth-of-field.

DOF.jpg

There are two methods of confirming the extent of the depth of the field: by stopping down the lens diaphragm or by reading a value from the depth-of-field scale on the lens.



Confirming the Depth-of-Field by: 1). Stopping-Down the Lens Diaphragm. Wind the film and determine the aperture required for the subject by metering, then set the f/stop by turning the aperture ring after disengaging the aperture ring from the "A" mark. 2). Press the stopped-down lever until it locks. Once locked, the depth-of-field can be checked by looking into the viewfinder. Thus, the extent of the depth-of-field can be seen as the zone of sharpness in the subject field observed on the screen. When the stoppeddown lever's release button is pressed, full aperture metering will be restored.



3). After having turned the aperture ring to the maximum f/stop on the lens, reset it to the "A" mark. Otherwise, you will not be able to obtain the correct automatic exposure for the next shot.



Stopping-down of the FD lenses should only be done after advancing the film. Should you not advance the film, the stopping-down of the lens diaphragm would only be possible up to the previous exposures aperture. Also, when the aperture ring is set at the "A" mark, the stopped-down lever cannot be pressed.

Generally, the depth-of-field will become deeper as the aperture becomes smaller, and shallower as the aperture becomes larger. A shorter focal length as well as a greater subject distance will also attain deeper zone of depth-of-field. Comparing an interchangeable 28mm lens with a standard 50mm lens set at the same f/stop, the 28mm lens's depth-of-field will be greater. And when the photographic distance changes, the depth-of-field changes, too. For example, if the same subject is photographed from three and then from seven meters away, the foreground and background of the subject will be deeper at the greater distance.

Stopped-Down Metering

When the AE-1 is used with Canon FD lenses, photography can be performed with through-the-lens (TTL) metering and with AE coupling. However, with the Canon FL lenses and most earlier non-auto coupled accessories such as bellows, extension tubes, or a microscope adapter, it is necessary to take a stopped-down meter reading.

Warning: The FD lenses with auto diaphragm mounted on the AE-1 should always be used with full aperture metering. Using stopped-down metering with FD lenses on the AE-1will give the wrong exposure. Skip this section if your optics are FD or New FD-type of lenses.

Stopping down the lens can be done by pushing the stopped-down lever until it locks. When the lens is stopped-down, press the shutter button halfway or depress the exposure preview switch and adjust the aperture ring and/or shutter speed dial until the meter needle inside the viewfinder is aligned with the stopped-down metering index mark. Press the shutter button and the photograph will be perfectly exposed. If the lens should be mounted on the camera with the stopped-down lever locked, correct exposure will not be obtained. In this case, a red warning mark by the stopped-down coupling lever inside the camera body is visible. After removing the lens, on the lower part of the camera body, just below the mirror, this stopped-down coupling lever becomes visible, as does the red mark in the case described above.

Se ti fai un giro tra le pagine del sito che ti ho linkato dovresti trovare tutte le informazioni che cerchi

[Rox85]

grazie ragazzi..pero' non riesco a capire come faccio a dare un esposizione corretta...quella data dall'esposimentro e' l'esposizione dell'obiettivo a diaframma completamente aperto,ma se io chiudo il diaframma l'esposizione rimane la stessa..e' un problema....mi piacerebbe avere una digitale