>> it appears a lot of Canons don't meter correctly unless you manually stop down the lens with the DOF preview button.<<
I don't understand this comment, or does the DOF preview button have a function I'm not aware of for a manual aperture lens?
my (limited) experience suggests to me that canon cooks the metering with oem ef glass, as I think all my non-oem meter poorly from 1.4-2.8, give or take.
I've only tried this with a few fast EF primes, but if I twist the lens a bit so the contacts don't mesh, I'll get different metering by at least 1/2 stop.
gpop wrote:
>> it appears a lot of Canons don't meter correctly unless you manually stop down the lens with the DOF preview button.<<
I don't understand this comment, or does the DOF preview button have a function I'm not aware of for a manual aperture lens?.
the way I understand it is that the body doesn't have a way of knowing what f-stop you have chosen. The only way to get a proper meter reading is to act as if the lens is wide open all the time, and to get the proper reading for stops other than wide open, you need to press the DOF preview, so the lens actually stops down to the f stop you have selected and then take the reading with the reduced amount of light coming in just like it will be during exposure.
I use a Nikon D7000 and on that body I can tell the camera what lens I am using in a custom lens preset. Once selected, the camera knows the focal length and f-stop range, allowing it to meter as if I am using a chipped lens that tells the body what's up. Since my 85mm is not chipped, my D90 body would not recognize the lens, and I was forced to shoot in full manual mode, without any metering. The Canon body I read about seems to be somewhere in between, at least letting you meter even if they don't know the lens.
gpop wrote:
my (limited) experience suggests to me that canon cooks the metering with oem ef glass, as I think all my non-oem meter poorly from 1.4-2.8, give or take.
I've only tried this with a few fast EF primes, but if I twist the lens a bit so the contacts don't mesh, I'll get different metering by at least 1/2 stop.
There is no contacts that can mesh on the Rokinon, except for the chipped Nikon version that costs $30 more and would actually work on some of the newer low cost bodies that won't meter with old MF glass. I don't know if there is a chipped Canon version available.
gpop wrote:
>> it appears a lot of Canons don't meter correctly unless you manually stop down the lens with the DOF preview button.<<
I don't understand this comment, or does the DOF preview button have a function I'm not aware of for a manual aperture lens?
my (limited) experience suggests to me that canon cooks the metering with oem ef glass, as I think all my non-oem meter poorly from 1.4-2.8, give or take.
I've only tried this with a few fast EF primes, but if I twist the lens a bit so the contacts don't mesh, I'll get different metering by at least 1/2 stop....Show more →
No, the remark about the DOF preview button is misinformed, I believe. It doesn't do anything when using an alt lens, with chipped adapter or unchipped. Edit: It may be different for Nikon cameras, but the DOF preview button on Canon bodies is purely electronic so it doesn't stop down the lens. The higher end Nikon bodies that have mechanical meter coupling don't require the DOF preview button either to do correct metering, as long as the used lens is of the AI or AI-s type.
sebboh wrote:
i have. image quality is great, but it's a bit large and unwieldy on the NEX. i use it more for portraits as well, which means i want to hold higher than waste level, so mostly i use it on my slr and take the OM 85/2 instead when i'm only bringing the NEX (the samyang is pretty much better than the OM in every respect except color).
....
Thanks, I'd love to pick one of these up, looks like an amazing lens, esp for the price, but the size seems a bit much to add to my walk-along kit.
Lots of misinformation floating around about the Canon bodies! I'm surprised, knowing they are popular, but I suppose most users don't get overly technical in their photography or have a long history of use with Canon SLR/DSLR models.
Canon will meter at any aperture manually set -- you don't need to check settings wide open or use the DOF stop-down switch. That comes from older bodies in the Film Era that used Stopped Down AE. Now you simply set the mode to Av or M and it will show you the "match needle" in M, or automatically choose the shutter speed in Av ("A"perture "v"alue).
Canon provides focus confirmation for properly chipped lenses -- certainly in the pro 1-series and 5-series. I'm not sure about the XXD or Rebel series. But this is of mixed or limited value in actual practice. Yesterday, using a 1Ds2, I was testing Zeiss ZE lens with focus confirm (using beep and visual), against a Samyang 35/1.4 without any focus confirm (establishing focus wide open, then closing down to desired aperture). I had equal success and failure rate with both lenses! That was for nearly 400 shots total. The focus chips are over-rated and over-relied upon, IMO. It is hard to get them where they are pin-point accurate, even from Zeiss, let alone a cheap lens adapter or add-on dandelion. I generally don't use the confirm chips, instead relying on FF or 1.3X viewfinder. More modern cameras can offer LV to assist if you keep it steady.
One huge advantage Canon has over Nikon: almost all Alt lenses fit on Canon EOS with a simple adapter, providing infinity focus. But Nikon is not able to use most Alt lenses due to its longer flange to sensor distance -- special modifications are needed for many available older manual lenses.
Rebel Guy wrote:
Would this lens work on a Canon 40D? or does it require an adapter? I don't have an option to search this thread for the answer.
Thanks.
-Frank
no adapter required for EF mount, just get the model for Canon.
AhamB wrote:
It may be different for Nikon cameras, but the DOF preview button on Canon bodies is purely electronic so it doesn't stop down the lens. The higher end Nikon bodies that have mechanical meter coupling don't require the DOF preview button either to do correct metering, as long as the used lens is of the AI or AI-s type.
here's the list of Nikon AF bodies that will take a non-chipped AI or AIs manual focus lens and meter properly once you tell them what is attached
D200/D300
D2/D3
D700
D7000
F6
chipped, you can use the lens on D40/50/60/70/80/90 as well
on none of them do you need the DOF preview button to meter correctly. The issue for Nikon users is really about being able to use the meter at all.
Question - how can you preview DOF on a Canon without actually stopping down the lens mechanically? Isn't DOF an optical function?
pburke wrote:
Question - how can you preview DOF on a Canon without actually stopping down the lens mechanically? Isn't DOF an optical function?
If you're talking about fully electronic EF mount lenses, there's a DOF preview button on the camera that stops down the aperture. The aperture is electronically controlled -- not by a lever.
For manual alt lenses you just set the aperture ring to the value you want. Almost all adapters to mount alt lenses to Canon have a screw or something that puts the lens in full manual/permanent stop down mode.
Hey Gunzorro...I have this one, too!! Fantastic lens for the price! Maybe not as sharp wide open as the Sigma or the 85Lll, but, it's good enough for what I do!
Gregg
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