-= 90D owners unite! Discuss and Post Photos

mfingar wrote in post #18947795
FOV on that one is roughly 2.5 x the viewfinders FOV when running 600mm. Just put the dot on the target and roll.

I’ve calibrated mine on a sandbag across my carhood, but a tripod helps. You’ll need to calibrate every time you remove and replace. And make a good practice of checking as you go along. I keep a hex key attached to the tripod, so it’s a two-sec thing.

Although these below videos depicts a different manufacturer they do IMO describe and visually show the possible advantages when shooting medium to larger distant objects using a longer Focal length prime or zoom lens.

https://www.youtube.co​m/watch?v=gnTAbBSUHZk

https://www.youtube.co​m/watch?v=HWxWYBPitBU

https://www.bhphotovid​eo.com …e_1_dot_sight_f​or.html/qa

Regards, Ron

Martin.D wrote in post #18967561
5D Mark IV came out early followed by the 90D.. Really does need good light..

For AF or low noise or both?

If it's about noise, the 5D4 can only beat the 90D by being closer to the subject, or using a lens with a larger entrance pupil.

With your zoom, you might get an advantage in favor of the 5D4 when you would have to zoom out wider with the 90D for the same wide FOV, in which case the 90D would be using a smaller entrance pupil. When both are zoomed to 400mm, and you are cropping the 5D4 more, the 90D should have less noise.

Low noise - There's a huge difference between the 5D IV and 90D files - 5D IV produces much cleaner files in low light, that and sharper images..

John Sheehy wrote in post #18967770
For AF or low noise or both?

If it's about noise, the 5D4 can only beat the 90D by being closer to the subject, or using a lens with a larger entrance pupil.

With your zoom, you might get an advantage in favor of the 5D4 when you would have to zoom out wider with the 90D for the same wide FOV, in which case the 90D would be using a smaller entrance pupil. When both are zoomed to 400mm, and you are cropping the 5D4 more, the 90D should have less noise.

Martin.D wrote in post #18967904
Low noise - There's a huge difference between the 5D IV and 90D files - 5D IV produces much cleaner files in low light, that and sharper images..

That's not the 5D4 alone though; it is also the lens used and the situation, which was my point.

The same zoom, however, becomes a different optic when you zoom out more with the 90D. The 5D4 at 400mm and the 90D at 250mm have the same angle of view, but the widest open the entrance pupil can go is significantly larger on the 5D4, so you get more light from your subject, and less diffraction relative to subject size, and better background separation. Crank the lens to 400mm on both, though, and crop the 5D4 1.6x as much, and then all 5D4 IQ advantage disappears, and the 90D has less subject noise and a lot more resolution, because the entrance pupil is the same, and the 90D has a smaller piece of a better capture medium.

John Sheehy wrote in post #18968005
That's not the 5D4 alone though; it is also the lens used and the situation, which was my point.

The same zoom, however, becomes a different optic when you zoom out more with the 90D. The 5D4 at 400mm and the 90D at 250mm have the same angle of view, but the widest open the entrance pupil can go is significantly larger on the 5D4, so you get more light from your subject, and less diffraction relative to subject size, and better background separation. Crank the lens to 400mm on both, though, and crop the 5D4 1.6x as much, and then all 5D4 IQ advantage disappears, and the 90D has less subject noise and a lot more resolution, because the entrance pupil is the same, and the 90D has a smaller piece of a better capture medium.

Of course the 5D4 will have more subject noise. You simply don't have many pixels defining the subject on the 5D4 under that situation.

Capn Jack wrote in post #18968018
Of course the 5D4 will have more subject noise. You simply don't have many pixels defining the subject on the 5D4 under that situation.

Not exactly. A Nikon D5 with the same lens should have slightly less noise than the 90D, with the same optics, despite having much lower subject resolution than the 90D, and a bit less than the 5D4.

John Sheehy wrote in post #18968031
Not exactly. A Nikon D5 with the same lens should have slightly less noise than the 90D, with the same optics, despite having much lower subject resolution than the 90D, and a bit less than the 5D4.

No, subject noise on the D4 will be worse. Remember "subject noise" is defined as pixelation. Fewer pixels on subject means more pixelation.

10 minutes after sunset...iso higher than i would normally go with my 70D, so not sure i would've been able to come away with anything with the old camera...bit of noise...but i'm not the best at handling noise, so may be ways to improve that...maybe that topaz denoise?

IMAGE LINK: https://flic.kr/p/2hTg​DgM

DreDaze wrote in post #18968532
10 minutes after sunset...iso higher than i would normally go with my 70D, so not sure i would've been able to come away with anything with the old camera...bit of noise...but i'm not the best at handling noise, so may be ways to improve that...maybe that topaz denoise?

IMAGE LINK: https://flic.kr/p/2hTg​DgM p-week47_19_0157m by andre gregoire, on Flickr

Some cameras may be better than others with noise with a given lens and shutter speed, but one general thing that you need to keep in mind is that low-light/high-ISO capture is most disadvantaged for higher display magnifications.

So, the less light you capture, the less magnified you should try to display the results, if you want noise to go unnoticed.

If you understand this and show images at fairly low magnifications, there are still possible problems. For one thing, if you are going to show a 32.5MP image at, say, 1MP as a web image, your 32.5MP should receive zero sharpening, even softening, if possible, and blasted with NR. There is no detail that you can see of one pixel or even two pixels wide in the original that can be salvaged and shown at 1MP - it is impossible to show it as anything other than aliasing or unnecessary noise. Also, you don't want to downsize with nearest neighbor, or allow the web server the potential to do that. That makes images seem sharper through aliasing, but it actually increases the image-level noise.

The noise in the 90D has one of the finest, most random characters of any digital camera with a sensor m43 in size or larger; noise mostly disappears with low image magnification, because the original only has fine noise and very little larger, chunkier noise grains that survive visiblitiy in low image magnifications.

DreDaze wrote in post #18968532
10 minutes after sunset...iso higher than i would normally go with my 70D, so not sure i would've been able to come away with anything with the old camera...bit of noise...but i'm not the best at handling noise, so may be ways to improve that...maybe that topaz denoise?

IMAGE LINK: https://flic.kr/p/2hTg​DgM p-week47_19_0157m by andre gregoire, on Flickr

And what was the ISO with the Coyote? There is no EXIF.

cdmazoff wrote in post #18968542
And what was the ISO with the Coyote? There is no EXIF.

It’s just 3200...1/100, f5.6, 600mm

Finally got a chance to use a 1.4x III extender with the 100-400L MKII and the 90D on Saturday. Certainly provides a noticeable amount of reach, but it took some getting used to only having the 27 AF point especially when shooting a heron where I wanted to keep moving the AF point higher in the frame. I have a feeling this combination will be getting a lot of use!

JayLT wrote in post #18969067
Finally got a chance to use a 1.4x III extender with the 100-400L MKII and the 90D on Saturday. Certainly provides a noticeable amount of reach, but it took some getting used to only having the 27 AF point especially when shooting a heron where I wanted to keep moving the AF point higher in the frame. I have a feeling this combination will be getting a lot of use!

Hi.. Nice shooting!!

They say that AF acquisition is slower the more points you use, besides which not all of the 27 points are cross point (see the Supplemental Info Guide for the 90D page 5 and look at Group G.

So, I max at 9 point for my BIF because there is no way in heck that I can keep the centre point on a bird's eye in flight.. Heck I have problems remembering where I parked my car!!!

All the best and looking forward to seeing more of your shots