david scerri , Feb 08, 2012; 03:42 p.m.
Hi. I'm a keen amateur, owner of a Canon 550D and a few lenses to go with it.
Recently inherited a few manual lenses from an uncle who was a very keen photographer and had a large collection of lenses and cameras.
Most of the ones Igot seem to be quite common and sold on the internet but I have a particular lens which I could find no info about:-
It's a Petri CC auto 135mm f 1:1.8 . There seem to be many 135mm Petri lenses with smaller max apertures, but could not find anything about this particular f 1:1.8 model. It is quite a large and heavy lens and has a screw fitment (I think it's a T2 mount).
Has anyone come across this lens or knows anything about it? Would be interested to know if it's a good lens to use on my Canon 550D (have adapter but currently only using autofocus lenses).
Appreciate any info, thanks.
David
paul wheatland , Feb 08, 2012; 05:56 p.m.
If it has an A/M switch you are good to go with a M42 lens to Canon EOS adapter. If it does not have a switch you'll need an adapter that has an inner ring to keep the spring loaded pin on the back of the lens pressed in allowing full range of f stops. Failing this the lens will only operate at f1.8 aperture on your EOS DSLR. Should you decide not to use the lens it does have some value to a user, because f1.8 lenses in longer focal lengths have more value than slower lenses. They however tend to be quite heavy and cumbersome and the depth of field at open f1.8 aperture is extremely shallow .
paul wheatland , Feb 08, 2012; 05:58 p.m.
david scerri , Feb 08, 2012; 06:14 p.m.
Thanks Paul for your reply and advice. It has no A/M switch and unfortunately the adapter I have does not press on the pin you mention. I will look for a way of keeping this pressed down to allow a smaller aperture. And you are right in saying that it's quite heavy and cumbersome! If I decide to use it on my 550D, I will probably have to support the lens, for fear of damaging the mount (on the camera side) due to the weight of the lens.
