Anyone using/used 1.6X crop camera with 300 f2.8 and 1.4X tele converter?

I use 30D and 300 2.8 + 1.4TC all the time. What's not to like about it? Get the 2XTC as well for this lens.

gyrob wrote in post #2043427
if you put it on a 400d and crop back to what a 1.6 20d /30d gives in MP's you gain more reach aprox 50mm extra on a 300mm lens so would be even more with a tc added.
i think my math,s are right .
Rob

What??? Are you trying to say that the 400D will allow you to crop and still maintain IQ based on the fact that it is a 10 MP camera as opposed to the 8 MP of the 20D/30D?

I use the 300/2.8 Is and a 2x often for hand holdable birding on my 20D. Always suprizes me how good the quality is.

In2Photos wrote in post #2043780
What??? Are you trying to say that the 400D will allow you to crop and still maintain IQ based on the fact that it is a 10 MP camera as opposed to the 8 MP of the 20D/30D?

YEP 480mm on a 1.6 crop 8mp and 516mm on a 1.6crop 10mp you gain 36mm over the 20d 30d - 672mm with a 1.4tc but on the 400d it would be 722mm this is because you multyply by 1.72 Not 1.6 to get the same pixel count - hard to get your head round i know but its true
Rob.

gyrob wrote in post #2044931
YEP 480mm on a 1.6 crop 8mp and 516mm on a 1.6crop 10mp you gain 36mm over the 20d 30d - 672mm with a 1.4tc but on the 400d it would be 722mm this is because you multyply by 1.72 Not 1.6 .
Rob.

So what do you lose if mounted on a 6MP 1.6 crop body?

malla1962 wrote in post #2044948
So what do you lose if mounted on a 6MP 1.6 crop body?

aske Rommy he worked it out for me way beyond my math's
Rob.

gyrob wrote in post #2044931
YEP 480mm on a 1.6 crop 8mp and 516mm on a 1.6crop 10mp you gain 36mm over the 20d 30d - 672mm with a 1.4tc but on the 400d it would be 722mm this is because you multyply by 1.72 Not 1.6 to get the same pixel count - hard to get your head round i know but its true
Rob.

that's precarious ground you are stepping on. it took me a while to fully comprehend this, but it is incorrect to be multiplying the focal length. The DOF will be the same, the distance of the subject will appear the same....the only difference is what part of the subject is hitting your sensor. with a 1.6x sensor, it simply isn't large enough to capture everything that is seen by a FF sensor. The only discernable advantage IMO is having the AF points covering more of the subject you are targeting.

gyrob wrote in post #2044931
YEP 480mm on a 1.6 crop 8mp and 516mm on a 1.6crop 10mp you gain 36mm over the 20d 30d - 672mm with a 1.4tc but on the 400d it would be 722mm this is because you multyply by 1.72 Not 1.6 to get the same pixel count - hard to get your head round i know but its true
Rob.

So now more MP=longer lens? I think the newbies will surely be confused when they read this. I know what you are trying to say but the way you have it worded is really confusing.

In2Photos wrote in post #2045006
So now more MP=longer lens? I think the newbies will surely be confused when they read this. I know what you are trying to say but the way you have it worded is really confusing.

well this is how it came to me lol

basically correct Rob, but let me clarify it further based on AOV and pixel size:

1. The 30D/20D/350D are 1.6 times "longer" than a mythical FF sensor with a similar number of pixels (8 MP).

2. The 400D with its 10 MP at the same sensor size is 1.12x "longer" than the 30D/20D/350D.

You can compute it in two ways (we take the 350D's sensor, which at 8.0 MP is a tiny bit smaller than the 30D/20D's 8.2 MP) :

1. Via pixel pitch

Extra reach = 6.4 microns/5.7 microns = 1.123

2. Via number of pixels

Extra reach = square root of (10.1/8.0) = 1.124

Romy
(and a big thanks to Romy for woring it all out )

gyrob wrote in post #2045054
well this is how it came to me lol

basically correct Rob, but let me clarify it further based on AOV and pixel size:

1. The 30D/20D/350D are 1.6 times "longer" than a mythical FF sensor with a similar number of pixels (8 MP).

2. The 400D with its 10 MP at the same sensor size is 1.12x "longer" than the 30D/20D/350D.

You can compute it in two ways (we take the 350D's sensor, which at 8.0 MP is a tiny bit smaller than the 30D/20D's 8.2 MP) :

1. Via pixel pitch

Extra reach = 6.4 microns/5.7 microns = 1.123

2. Via number of pixels

Extra reach = square root of (10.1/8.0) = 1.124

Romy
(and a big thanks to Romy for woring it all out )

I get all this but if we follow this principle we will eventually be able to shoot long distance birds with a "mythical" 500MP sensor and a 50mm lens (no I didn't do the math, just speculating).

And no disrespect meant to Rob or Romy I just think this is a bad way to look at the extra 2MP of the 400D.

In2Photos wrote in post #2045098
I get all this but if we follow this principle we will eventually be able to shoot long distance birds with a "mythical" 500MP sensor and a 50mm lens (no I didn't do the math, just speculating).

And no disrespect meant to Rob or Romy I just think this is a bad way to look at the extra 2MP of the 400D.

well to be honest i think im the only one looking at it this way but could not work out the field of view/ mp's bit, this thred exsplains more about it and my way of thinking
Rob.
https://photography-on-the.net/forum/showthre​ad.php?t=211387