Question about Panasonic 14-140mm versions

Started 2 weeks ago | Discussions thread
OP dbateman Contributing Member • Posts: 521
Re: Question about Panasonic 14-140mm versions
2

OutsideTheMatrix wrote:

dbateman wrote:

OutsideTheMatrix wrote:

sensitivity to "invisible light" as it's called is down to the UV/IR blockers that are used over the CCD, not usually a characteristic of the lens itself.

Actually quite wrong with your assumption here. The glass used will have significant impact on light transmission. Also the coatings used on the elements. Then hot spots can occur depending on reflections within the lens and the quality of the specific filter you use. This can all be seen even with a leaky Olympus camera that allows quite a bit of IR through the blocking glass.

A full spectrum converted camera, like I have will show you more obviously. But you maybe surprised that a off the shelf EM1mk1 is quite sensitive to IR and will also show you the contrast and sharpness difference between lenses.

I am looking for a weather sealed all purpose lens also capable of IR. It seems to be between the Panasonic 12-60mm f3.5/5.6 or Panasonic 14-140mm f3.5/5.6. The Olympus 14-42mm R2 is great for IR and even UV. But its not sealed and has a limited range. This one I own and have played with. The Olympus 14-54mm mk1 I also own and is great for IR. But with the death of Olympus will need a m43rds weather sealed lens as it only focuses fast on EM1 bodies and I want more m43rds choices going forward.

well with UV there is more of an impact because quartz lenses are better for passing light and they are quite rare and expensive, but as far as IR is concerned, isn't the better way to go about it to have a full spectrum conversion done?

Wow, I am surprised by what you mentioned with the EM1Mk1......Olympus is known to use rather strong blockers. Do you think other Oly cameras like the EM10Mk2 are just as sensitive? I have been using my Fuji HS50 for IR since it is rather sensitive to both IR and UV....even at the long 1000mm EFL tele end, it can autofocus at tele quite easily during the day. I measured only a -6.7 stop light loss when using a B+W 072 filter on that camera, so it has become my one stop shop for false color IR photography.

Actually quite the opposite. Olympus cameras are known to have really weak UV and IR blocking. Panasonic has strong UV and IR blocking.

My stock Em1 Mk1 was sensitive to UV and IR. My stock Em5mk2 is 1/3 less sensitive to UV than my stock EM1 was before full spectrum conversion.

My GM5 is at least 5 stops less sensitive to UV than my stock Em5mk2. Also at least 1 stop less sensitive to IR. I would have to look up the exact numbers from my last test.

I haven't used the Em10 series, so can't comment. But assume it to be similar to Em5's. As similar sensor. The Panasonic MN34230 in the Em1mk1 is very UV sensitive.

 dbateman's gear list:dbateman's gear list
Olympus E-3 Sigma SD14 Olympus E-M1 Nikon Df Panasonic Lumix DMC-GM5 +1 more
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