Focusing on infinity with canon mod and camera lens?

[pixueto]

Dear all,

Is anyone there using a modified canon 450D (only rear filter removed with no replacement) with canon lenses? Any problem focusing to infinity with this configuration? Can still be brought to focus on infinity with a Canon 50mm f1.8 lens?

Thank you very much

[michaelmorris]

That's weird, I was about to post exactly the same question! I'll watch this one with interest.

[melsky]

When I first had my 550D modded I was very disappointed that I couldn't get my 50mm Zuiko lens to focus on infinity, however, when I put the astronomik clip filter in the camera BINGO it pushes the focus back so no problems. My newer 600D is exactly the same, with short focal length lenses I have to use a clip filter, hope that helps.

Mel

[michaelmorris]

When I first had my 550D modded I was very disappointed that I couldn't get my 50mm Zuiko lens to focus on infinity, however, when I put the astronomik clip filter in the camera BINGO it pushes the focus back so no problems. My newer 600D is exactly the same, with short focal length lenses I have to use a clip filter, hope that helps.

Mel

Thanks. Which type of modification did you have done?

1 - filter replacement

2 - removal of rear filter only

3 - removal of both filters

Thanks

[pixueto]

I can use mine with an old 200 mm Solignor lens (F5.5) with an adapter for M42 lenses. In that configuration it focus to infinity easily. Would it be any different for other lenses?

Thanks

[melsky]

Mine - 2 - removal of rear filter only

[Merlin66]

I have both filters removed in my 1000D for spectroscopy.

To achieve focus with standard EF lenses I had to use an Astronomik MC (clear) clip-in filter.

[Gina]

All my M42 thread lenses are fine

[studdedsole]

With the front filter removed but the rear left in place you may struggle to focus EF lenses below 15mm focal length, above this you should be fine, however if you find 50mm is marginal the EOS clip may just be sufficient to correct the focussing problem.