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Tony Northrup shows his lack of knowledge about the A-mount lens history


OldNoob
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..............

 

At the 1:15 point he wrongly says the A99ii's translucent

mirror reduces light by 30%! DxO says it's 1/3 F-stop ........

Big misstatement. 

Big misstatement ? You are refering to the difference

between 1/2 stop and 1/3 stop as a "big misstatement".

 

It's an innaccurracy, but rather minor. Tony N. is just a

nobody. What's HIS resume anyway ? Keep calm and

carry on :-)  

  

And ignore DxO. DxO and Tony N. are just flip sides of

the same coin. Just slick BS. One version all dressed

up in geek tech and the other slathered in smiley gloss.

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Big misstatement ? You are refering to the difference between 1/2 stop and 1/3 stop as a "big misstatement".

It's an innaccurracy, but rather minor. Tony N. is just a nobody. What's HIS resume anyway ? Keep calm and carry on :-)  

And ignore DxO. DxO and Tony N. are just flip sides of the same coin. Just slick BS. One version all dressed up in geek tech and the other slathered in smiley gloss.

 

Thanks Golem! I'll take your word for it as I obviously lack technical camera knowledge as most of you at this forum. I am, however, interested in learning all I can. 1/3 f/stop sounds minor compared to Tony's 30%.

 

I'm very interested in the a99ii & the mirrorless a7Rii which is nearly feature identical; even in price. I favor the a99ii for mainly two reasons - larger battery & A-mount lenses. There's a wider selection of A-mounts although I read Sigma is to support E-mounts soon (other than the MC-11 adapter).

 

What's your thoughts? And, can you suggest better sites than DxO? It seems many other site quote DxO offten.

 

Thanks, George

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What's your thoughts? And, can you suggest better sites than DxO? It seems many other site quote DxO offten.

 

 

 

diglloyd (subscription) is testing equipment, explaining how its performing under different conditions, and discussing technique. I find it useful ... DxO is giving you a number, so that is kind of useless if you want to learn something - you get what you pay for.

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  • 4 weeks later...

......... 1/3 f/stop sounds minor compared to Tony's 30%.

 

...........

Actually, to give Tony his due, he's just speaking in reverse. 

Sorta just a slip of the tongue. As you know, most fractions 

are not "reciprocal" in terms of casual conversation. IOW a 

50% increase is not a 50% decrease if you remove it. It's a 

50% increase when you apply it but it's a 33% decrease if 

you remove it. 

   

So, while the SLT mirror does not cost you all of 30% light 

received, if you REMOVED it, you would gain 30% :-) The 

reciprocal of 30% is 23%, so the SLT mirror transmits 77%.  

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