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Old Tuesday 20th September 2016, 08:25   #1
Gduff
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comparison ATX95 vs ATM80 (amount of light)

Hi,

I currently own a Swaro ATM80 HD with 25-50x zoom, and I'm interested in the new ATX95 30-70x.
I know it's better to compare images from 2 models at the same zoom, but I would like to know if there is the same amount of transmitted light between the 2 scopes at full zoom, i.e. ATM80 at 50x, and ATX95 at 70x?

These days I'm using my scope near a large river, and I'm always too short for the birds, so that I'm sure I would use the 30-70x at full zoom.

I would like to know if my camera would chose the same ISO speed between the 2 setups, and so if my photo at 70x (on ATX95) would be the same quality as the one at 50x (on ATM80).

Thank you for the answer
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Old Monday 13th March 2017, 15:15   #2
Gduff
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I'm upping this thread as I'm still interested in the answer!
Thanks
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Old Monday 13th March 2017, 15:45   #3
Vespobuteo
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At 50x the 80 mm scope will appear 39% brighter than the 95 mm at 70x. It's just 1/3 stop in photographic terms, i.e. with the 95mm@70x you would get ISO133 instead of ISO100 (with the same shutter speed and aperture).
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Old Sunday 7th May 2017, 01:01   #4
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From what I have read and seen... the light transmission of the new Swaro ATX modular scope is around 91%. The Swaro 80mm ATS is around 87% (with the 25-50 eyepiece), while the Swaro ATM is around 82-83 % (with the 20-60 eyepiece). I haven't seen the specs of the ATM with a 25-50 but I have a feeling it is less. At one time another I had new ATS in 2009, sold it, and eventually bought an ATM. Both scopes used the 20-60 eyepiece and the ATM was measurably difference.

The human eye can discern a difference of 3% or more, so when I moved from the ATM back to a new ATS I recently purchased, it was measurable so I am using that as a gauge that the ATM is still less light transmission than the ATS even if both use the 25-50 eyepiece.
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