Canon t90 stop down mode below 5.6

kingbuzzie · Aug 27, 2016

I'm out at the park trying out an industar 50-2 lens. In av mode I can't set my t90 below 5.6. Designed that way? Never mind.... just use the stop down lever and the camera turns off the aperture calculation.

benjiboy · Aug 27, 2016

The T90 wasn't designed to work with F.S.U. lenses only FD ones, you are pulling a space rocket with a cart horse be careful not to damage it.

AgX · Aug 27, 2016

The AV-mode of the T-90 needs an FD mount lens. May that be from Canon or another manufacturer.

A Industar with FD-adapter just would couple lens and body (and at its best would yield the automatic diaphragm). Nothing more!

onre · Aug 27, 2016

Probably because the lack of mechanic connections prohibits the T90 from getting the actual maximum aperture of the lens.

AgX · Aug 27, 2016

There is no coupling of that kind. The lens is lacking that "aperture-simulator" actuator. Amongst other things.

Poisson Du Jour · Aug 28, 2016

I suspect the T90 aperture coupling will be mangled when the Industar lens is removed. I doubt the lens is coupled to the camera at all because it pre-dates the T90 by years. I'm frankly aghast at such a daft thing to do as use ancient Soviet-era lenses on modern electronic camera bodies. The T90 had its game sorted well and truly with FD-mount lenses (of which there are many still an abundance). For the operational integrity of the T90, an FD lens is what you should be using.

kingbuzzie · Aug 28, 2016

You might be right. I totally shouldn't have used that super glue and duct tape to hold it on instead of a m42 adapter

onre · Aug 28, 2016

AgX said:
There is no coupling of that kind. The lens is lacking that "aperture-simulator" actuator. Amongst other things.

I thought that in FD mount the maximum aperture is communicated by how far the aperture lever goes before the maximum aperture pin moves. Not my favourite mount, really.

AgX · Aug 28, 2016

No, the maximum aperture is communicated by one of the static bolts (buttons) at the lens mount.

Anyway, in this context this is a academic discussion, as the OP tried to use a lens that will not work with the camera in the set mode.

onre · Aug 28, 2016

AgX said:
No, the maximum aperture is communicated by one of the static bolts (buttons) at the lens mount.

Anyway, in this context this is a academic discussion, as the OP tried to use a lens that will not work with the camera in the set mode.

Indeed. Every day one learns something new.

AgX · Aug 28, 2016

The T90 offers two means to use the Industar lens:

-) manual stopped down metering

-) stopped down auto-exposure

kingbuzzie · Aug 28, 2016

AgX said:
The T90 offers two means to use the Industar lens:

-) manual stopped down metering

-) stopped down auto-exposure

I was using stopped down auto-exposure. The problem was I have never used a non-fd lens with an adapter. I hardly use the canon t90 period. The camera automatically sets the lens to manual when you put on the adapter, and when in AV mode you can set the camera to meter the incoming light to a set F-stop on the camera. It doesn't do anything to the lens, it just meters the light to what it thinks the f-stop is, regardless of what the f-stop is on the lens. I was incorrectly trying to set the fstop on the camera, then set the f-stop on the actual lens get the auto exposure. Problem was, it wouldn't go below 5.6 on the camera. Then duh, I realized the stop down lever turns off the camera's f-stop calculation altogether. I gotta say though, some of the replies weren't very helpful, and even for a super rookie like myself I know better than to think I was going to mangle the coupling or I somehow shoehorned the lens in with chisel and hammer. Or the criticism of using a vintage lens (and gasp Soviet!) was also pretty elitist as well. Disappointed in "apug" today.

BTW canon MADE a m42 to fd adapter. Works quite well.

shesh.

AgX · Aug 28, 2016

I do not think Ben was elitist in this case, but instead he is true in that no soviet lens was made to work on the FD-mount (in contrast to many japanese ones). At least I read his post that way.

And you yourself in your first post did not speak of using the camera in stopped down mode, but just in "AV" mode which is something different, and thus would yield erronous result. And otherwise would necessitate a FD-lens.

kingbuzzie · Aug 28, 2016

If it clears the mirror and focuses to infinity, it will work. It was made to work with a screw mount. It is rather irrelevant if the lens maker sat down to discuss what this had to do with canon fd. Pedantic.

benjiboy · Aug 29, 2016

Poisson Du Jour said:
I suspect the T90 aperture coupling will be mangled when the Industar lens is removed. I doubt the lens is coupled to the camera at all because it pre-dates the T90 by years. I'm frankly aghast at such a daft thing to do as use ancient Soviet-era lenses on modern electronic camera bodies. The T90 had its game sorted well and truly with FD-mount lenses (of which there are many still an abundance). For the operational integrity of the T90, an FD lens is what you should be using.

Yes as I wrote "he's pulling a space rocket with a cart horse", Canon FD 50mm f1.8 can be bought for buttons these days and will allow the O.P. the all the electronic facilities his T90 is capable of.

AgX · Aug 29, 2016

I take a different stand. Just because the T90 not only offers manual metering in stopped-down mode (as for intance thee AE-1 offers too), but even an automated mode, it is best suited to use (adapt) non FD-lenses.
Of course as you both put it correctly, it makes no sense if one just wants to use the alien lens as substitude for the original FD normal-lenses just for lack of these.

flavio81 · Aug 29, 2016

kingbuzzie said:
I'm out at the park trying out an industar 50-2 lens. In av mode I can't set my t90 below 5.6. Designed that way? Never mind.... just use the stop down lever and the camera turns off the aperture calculation.

Why... oh why?? WHY??

Why do you want to use the T90, the most advanced manual focus camera from Canon, with something other than the magnificent, beautiful, sharp, contrasty, reliable, CANON FD LENSES; or in any case the massive, tough, and classic CANON FL LENSES? Or, ok, if you don't want to use those lenses, the antique, pretty CANON R LENSES?

Industar 50-2 lens belongs to a screwmount body, for example a beautiful Pentax Spotmatic, and then, ONLY if the Pentax is in the mood to accept anything other than the beautiful, sharp, contrasty, reliable, magnificient and smooth TAKUMAR lenses.

If you want a great russian lens worthy of the T90, look for the Helios-40-2.

kingbuzzie · Aug 30, 2016

flavio81 said:
Why... oh why?? WHY??

Why do you want to use the T90, the most advanced manual focus camera from Canon, with something other than the magnificent, beautiful, sharp, contrasty, reliable, CANON FD LENSES; or in any case the massive, tough, and classic CANON FL LENSES? Or, ok, if you don't want to use those lenses, the antique, pretty CANON R LENSES?

Industar 50-2 lens belongs to a screwmount body, for example a beautiful Pentax Spotmatic, and then, ONLY if the Pentax is in the mood to accept anything other than the beautiful, sharp, contrasty, reliable, magnificient and smooth TAKUMAR lenses.

If you want a great russian lens worthy of the T90, look for the Helios-40-2.

For the same reason I have an unrestored 1964 vnb5. It's fun and didn't cost a lot. It's not like rubbed the front of a holga lens with sandpaper and called it art. It's ok though, no real harm done other that a bit of disappointment on my part.

dynachrome · Aug 30, 2016

I have adapters to use M42 lenses on many different cameras. When it comes to Canon I prefer using an M42 lens on an F-1 or on an FTb. It just seems more cumbersome using them on an AE-1 Program or on an A-1. I do not have a T90. Apart from correct infinity focus (macro work excepted) the most important feature the M42 lens must have is an A/M diaphragm switch. Of course it's important for the back of the lens to clear the mirror too. Will a 50mm f/2 Industar perform as well as a 50/1.8 Canon FD SC? Probably not.

flavio81 · Aug 30, 2016

dynachrome said:
I have adapters to use M42 lenses on many different cameras. When it comes to Canon I prefer using an M42 lens on an F-1 or on an FTb. It just seems more cumbersome using them on an AE-1 Program or on an A-1. I do not have a T90. Apart from correct infinity focus (macro work excepted) the most important feature the M42 lens must have is an A/M diaphragm switch. Of course it's important for the back of the lens to clear the mirror too. Will a 50mm f/2 Industar perform as well as a 50/1.8 Canon FD SC? Probably not.

I've considering doing the same (my New F-1 is my favorite 35mm camera), but my Spotmatic allows for auto diaphragm, which really makes things faster to operate, has perfect ergonomics and a very good focus screen.

Canon t90 stop down mode below 5.6

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