[hoanpham]

It's not a mirror lens.
The mount is swap-able.
Just screw off the 3 screws and replace with another.

[barryl]

i have another lens i was looking at doig that but i thought i would wait for the t mount first then try that or continue hunting

[barryl]

ok not a tmount lens adaptor will not fit

[i_trax]

well, there was Miranda M44 screw mount and also Exacta/Topcon 37mm ( M37x0.75) screw mount but you were saying that this is definitely 42mm?
and as far as I know there were only two M42 + T2 mounts with 42mm diameter, deeply puzzled?

[barryl]

so am i .i just rechecked and it is a 42 mm the bloke i bought the t mount is to he asked for all the info on it and i sent him the same pics as i put up here. you mentioned the miranda lens i wonder if the m1 or i on the lens may have some thing to do with miranda .i know its becoming a pain.as hoanpham mentioned its a swapable but i do not know where to start looking for another one

[i_trax]

Miranda is 44mm so not it?
is that it ( or similary looking) what you have ordered:
T 2 T2 T Telephoto Lens TO Pentax PK Mount Ring Adapter K 7 K20D K100D K200D K R | eBay

[Odinz]

The lens looks like it already has a T-Mount adapter attached, you should be able to unscrew that whole piece from the bottom of the lens and attach the new one when you get it. If it's been on there awhile it may be tight or a previous owner may have even glued it or attached it with Locktite to keep it from turning loose.

Actually, now that I think of it I think I have an older T Mount adapter that has an 'MI' on it. I don't have it here with me but if I remember correctly that adapter actually threads into another T-mount adapter (44x.75 threads) and I could never figure out why I would need do that.

[bassek]

The lens looks like it already has a T-Mount adapter attached, you should be able to unscrew that whole piece from the bottom of the lens and attach the new one when you get it. If it's been on there awhile it may be tight or a previous owner may have even glued it or attached it with Locktite to keep it from turning loose.

I second Odinz.

I had a similar 400mm lens that looked almost the same. On your pic the "T-mount to MI" adapter is in place. Remove it and replace it with your new T-mount to K.

Seb

[barryl]

ok i have a mount which i was going to put on off amarexar 400mm lens found out i cant do that it has a 55mm openingso that one is out .problem no 2 took the other mount off was not glued only screwed up pulled the collar out of the new t mount went to fit it does not go on.the mount that is there the screw mount opening is 49mm new t mount with collar out is 48mm so i am still stuck

[Odinz]

If I understand you correctly are you saying that you took the T Mount apart and only removed the outer ring and left the inner ring on the lens? The small screws around the perimeter of the mount are to adjust the position of the mount when the lens is on the camera so that the top of the lens points up. The collar should stay in the mount and the whole mount (both the inner and outer rings) should twist off of the rear of the lens together. I have several T mounts where the inner ring from one manufacturer is a different diameter than ones from another so often times cant switch those between different mounts.

[barryl]

yes you are correct i did not realise the whole thing screwed off till you mentioned it .i just tried to unscrew the inner it will not move by hand .i will put it back together and try it .it does not look like it has been glued if it does nor move do you think i should try a pair of pliers or some thing similar or have you got a suggestion so i do not stuff the lens

[barryl]

thanks odinz you were right on the money up and working now.i learnt a lot about these types of lenses thank you for your help

[Odinz]

You're welcome, I'm glad it all worked out for you, enjoy your new lens!

[greenas]

Hi , I don't know how to write a private message to you, but do you still have this lens? Are you using it? What is an opinion about it?