Estimating extra reach (resolving power) of crop vs FF

[FEBS]

By the way FEBS, I am the treasurer of FEBS so watch your bank account!

Oh, it was you that did somewhere make a remark about the word FEBS. I forgot what it meant for you but for me it's indeed an abbreviation, but from Francois, Elly, Bart & Sarah., So all the members of our family.

Francois

 

[Valvebounce]

Hi FEBS.
I have to say that this was one of the best things I did, bought a Black Rapid Double! I carried a Gripped 40D with a Sigma 150-500 and a Gripped 7D with 70-200 2.8 II with 2x III all day, felt no ill effect AT ALL, compared to carrying just the Un gripped 7D with 17-70 for part of a day giving me neck ache and subsequently a head ache!
I also bought an OpTech pro strap, the spongy springy one, I have yet to try that one in anger, but it is shaped to keep the strap down off the neck a bit, and is springy to help reduce the perceived weight of the gear.
Definitely ditch the original strap for long shoots carrying a camera!

Cheers, Graham.

But if it is really the weight for walking around then you will not feel the difference. as the weight of a 7D2+1.4x+300/2.8 compared to 5D3+2.0x+300/2.8 will be something about 200gr. The only advice I can give you for that is NOT to use the standard strap. I have now problem for walking around a whole day with a 5D3 with 70-200/2.8 and a 1Dx with 200-400/4 or 300/2.8+2.0x. I use double strap from black rapid, and at the end of the day you will feel nothing there about. But the standard strap of Canon, I will feel my neck within a few hours even with the 7D+70-200/2.8.

 

[AlanF]

Yesterday, I tried out the 70D with the 300/2.8 II + 1.4xTC III. It was good at f/4. But, for reach limited subjects, the 300/2.8 II + 2xTC III was even better.

An interesting point I read on TDP from a conversation with Chuck Westfull. You read regularly that the 1.4xTC III slows down focussing speed by 50% and the 2x by 75%, but in practice they do not. Addition of a TC actually speeds up focussing because the glass has to be moved through shorter distances and so the 50% and 75% reductions are there to bring them back to the speed of the bare lens.

 

[skoobey]

Has nothing to do with resolving power, both of them have great resolving power, it's about two things:

Working distance. Crop has more reach, FF can be used to get super wide shots in tiny spaces.

Depth of field. At same composition, same lens, same settings, FF will give you shallower depth of field. Why? Because you're much closer to the subject.

 

[SPKoko]

Yesterday, I tried out the 70D with the 300/2.8 II + 1.4xTC III. It was good at f/4. But, for reach limited subjects, the 300/2.8 II + 2xTC III was even better.

Do you mean that the 2xTC on FF is better than a 70D+1.4xTC? And what about a 70D vs 1.4xTC on FF?

 

[AlanF]

Yesterday, I tried out the 70D with the 300/2.8 II + 1.4xTC III. It was good at f/4. But, for reach limited subjects, the 300/2.8 II + 2xTC III was even better.

Do you mean that the 2xTC on FF is better than a 70D+1.4xTC? And what about a 70D vs 1.4xTC on FF?

I posted earlier an example where 70D with the 300/2.8 II + 1.4xTC III was as good as 5DIII with the 300/2.8 II + 2xTC III. I meant here that 70D with the 300/2.8 II + 2xTC III was better than 70D with the 300/2.8 II + 1.4xTC III in a highly reach limited situation.

I haven't compared 70D plus 300/2.8 II vs 5DIII with the 300/2.8 II + 1.4xTC III.