Any leica screw-mount lens out there with Infrared marking?

[TrailsofLife]

Hi all RFers,

I am venturing into film IR after meddling with digital IR for about a year now . I realised my canon film SLR can't use IR film because of some thing in the camera that will fog the film.

So I am thinking of using my Bessa R, that's been resting for a long while, but the problem is there's no "R" marking on both my 35mm skopar and 50mm nokton so focussing maybe a problem. Anyone can recommend me a solution or at least a affordable old lens with "R" marking?

Cheers
Max 2.8

[sabrewolf]

The red focusing mark can be easily approximated on the lens. Just focus the lens at closer distance than infinity mark. As I understand it you should be fine because:

1. If you are shooting landscape IR, your aperture will be stopped down anyway which will provide generous DOF

2. In case you do not know the red IR marking should only be use if you intend to focus at infinity, any other focusing distance has different point of focus on the IR range and you cannot use the red IR marking other than for approximation (i.e. it is not linear) I hope this is not confusing.

[TrailsofLife]

Originally Posted by sabrewolf The red focusing mark can be easily approximated on the lens. Just focus the lens at closer distance than infinity mark. As I understand it you should be fine because: 1. If you are shooting landscape IR, your aperture will be stopped down anyway which will provide generous DOF.

Abit is how much? Like how many mm or cm? Can specify?

Originally Posted by sabrewolf 2. In case you do not know the red IR marking should only be use if you intend to focus at infinity, any other focusing distance has different point of focus on the IR range and you cannot use the red IR marking other than for approximation (i.e. it is not linear) I hope this is not confusing.

Oh! Is it? Never shoot IR film before.. If I want to do a IR portrait how?

By the way, thanks for helping, just beginning to venture into IR film...

[eawtan]

The older summar and summitar's should have the IR focusing point... checkout ebay for photos...

Originally Posted by Max 2.8 Hi all RFers, I am venturing into film IR after meddling with digital IR for about a year now . I realised my canon film SLR can't use IR film because of some thing in the camera that will fog the film. So I am thinking of using my Bessa R, that's been resting for a long while, but the problem is there's no "R" marking on both my 35mm skopar and 50mm nokton so focussing maybe a problem. Anyone can recommend me a solution or at least a affordable old lens with "R" marking? Cheers Max 2.8

[Keltzar]

Do some research on the voigtlander m39 lenses marked as APO. In theory, a perfectly corrected lens that's APO will not need an IR mark since all 3 beams i.e. R,G,B all meet at the same point.
This is not the case in APO lenses that are not perfectly corrected, or in regular achromatic lenses ... hence the red IR mark.

A good example are some canon L lenses or Sigma APO lenses, which are not perfectly corrected... hence the IR mark.

If you want to use EOS, consider getting the old EOS 620, 630 ... or even the EOS 1 or 1N . These do not have the whisper transport which uses an IR film counter and hence will not fog the film.

These old EOS are changing hands for as little as $50.

[TrailsofLife]

You mean no need to compensate for bessa's lens?!!

If got lobang for eos 1, let me know, $100 I grab, dun say $50..ha ha ha