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Pink Grapefruit Infrared Photography

Started May 29, 2021 | Photos thread
petrochemist Veteran Member • Posts: 3,619
Re: Pink Grapefruit Infrared Photography
1

JeanPierre Martel wrote:

Gesture wrote:

Are the Full Spectrum conversion images as sharp when using correction filters on the lens, as opposed to a more conventional single wavelength IR conversion?

No, they are not as sharp.

When used full spectrum it's not as sharp due to chromatic aberration across the much wider spectrum (and outside of a lenses design parameters). I've used filters giving UV, blue & IR on my FS converted cameras, shots with those are typically softer than a simple 720+ conversion, as the light being recorded focuses at different distance from the lens.

DSLRs are not commonly used for full spectrum conversion since their viewfinders don't show the scene with an IR filter on the lens. It's the benefits of an EVF that have given rise to the popularity of Full spectrum conversions

It is necessary to re-calibrate the focus system on a DSLR when it's converted, but not on mirrorless cameras as focus is done using the main sensor. Focus works exactly as it should, so when used with a filter on the lens giving the same wavelengths as a dedicated conversion there is no difference in sharpness with mirrorless cameras as long as the conversion has been done to the same standard.

Just how sharp the image is of course depends on the lens & the optical quality of the glass/silica used to replace the internal cut filter during the conversion

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