Infrared conversion

mth1993b wrote:

I have been shooting with a full spectrum converted camera using ir lens filters. I use live view with contrast focus 100% of the time.

I really like this setup. I am thinking of upgrading the body and since I use live view for focusing do i really need to replace the blocking filter with a clear one or just remove the filter?

Thank you in advance for your assistance.

If you don't replace the filter at all the available focusing range will be altered.

With the point & shoot I home modified focus was limited to about 3m maximum (not very useful for most IR shooting). My Sigma Sd14 gets converted to IR by simply removing the 'dust filter' from inside the lens mount (a very basic job) with the filter removed some lenses focus to infinity, others don't.

If you wish to try recording ultraviolet at all (either just UV or IR & UV combined etc) then you should use quartz as a replacement, if your only interested in combinations of visual light & IR normal glass will do for a replacement (which is strictly a '2 spectrum' conversion rather than a full spectrum conversion)

I strongly suspect the first 'full spectrum' camera I brought was in-fact a '2 spectrum' conversion, results for IR are great but the UV end is just not there at all. Results from my second full spectrum conversion are often different in colour when using blue filters...

FWIW my full spectrum converted cameras are both mirrorless, so the EVF gives me full views of the wavelengths the camera can see & both contrast & phase AF are available as normal. They also have more flexibility in adapting odd lenses

I use IR filters, coloured filters, NDs & special UV pass/visual blocking filters all of which transmit significant IR. There are some UV only filters around but they're too expensive for me...