prime lens question

Hey all Been looking at getting another prime lens. was looking at the 100 mm 2.8

If i took my 50 1.8 and put a 2x on it would that be pretty much the same as the 100mm?
Thanks jay

And hope all has a happy rainy 4th

50 f/1.8 + 2x multiplier would create a 100 f/3.6 and a bit of loss in image quality.

I'd purchase the 100 f/2.8 Macro and your image quality would be outstanding without sacrificing lens speed and, while you do not mention a desire to pursue macro, the 100 f/2.8 would provide that option.

Naturalist wrote in post #8222381
50 f/1.8 + 2x multiplier would create a 100 f/3.6 and a bit of loss in image quality.

I'd purchase the 100 f/2.8 Macro and your image quality would be outstanding without sacrificing lens speed and, while you do not mention a desire to pursue macro, the 100 f/2.8 would provide that option.

but for the most part would be pretty much the same.

yeah I was looking at the 100mm 2.8 and the other one. I think I will go with the macro don't have a good one of them

thanks jay

jay6776 wrote in post #8222514
but for the most part would be pretty much the same.

yeah I was looking at the 100mm 2.8 and the other one. I think I will go with the macro don't have a good one of them

thanks jay

No it wouldn't. It would produce the same focal length and a slightly slower aperture, but it would not be "pretty much the same" in image quality, focusing speed, build quality and other important ways.

Which 2X would you consider using?

Naturalist wrote in post #8222381
50 f/1.8 + 2x multiplier would create a 100 f/3.6 and a bit of loss in image quality.

I'd purchase the 100 f/2.8 Macro and your image quality would be outstanding without sacrificing lens speed and, while you do not mention a desire to pursue macro, the 100 f/2.8 would provide that option.

I'd bet it would result in more than "a bit" of IQ loss .

I agree with runninmann: "pretty much the same", if you consider focal length only. Otherwise, not the same at all.

A 2x TC would also not put you in the same ballpark of the macro lens' close focusing ability. The 50 is also not that sharp at f1.8, so you would want to stop it down to about f2.5-f2.8. Now with the TC, that become f5-5.6, and the TC would add in some more softness. At that point, you might as well have bought a $100 70-300 or 50-200mm lens and used it at 100mm f4.5-5. TC's were made for long lenses where you have no other options for going long. From 50 to 100mm you have a bundle of cheap options.

I'm gonna wake up in the middle of the night tonight from having a nightmare about someone using a 2X TC on a 50/1.8. Shudder.

I tried putting the 50/1.8 II on a Tamron 2x TC. The image quality wasn't terrible, however forget using autofocus. Since the lens isn't designed for a TC and since the TC doesn't have reporting contacts, the lens doesn't know to slow down its autofocus like the telephotos do to compensate for the TC. The AF will overshoot and oscillate. You can still focus manually carefully and use the autofocus confirmation dot. I no longer have the Tamron to test with.

It is much better to just buy the 100mm f/2 USM or the 100mm f/2.8 Macro.

TCs aren't a magic bullet. Teleconverters should be used only when you have no other options to increase the focal length.

gasrocks wrote in post #8222960
I'm gonna wake up in the middle of the night tonight from having a nightmare about someone using a 2X TC on a 50/1.8. Shudder.

LOL

Canon does not recommend using teleconverters on lens shorter than 135mm.

The 100mm is a killer lens. If I were in your position (actually... I am...) I would (and am) save(ing) for the 100mm 2.8.

I doubt you'll be disappointed.

I was just try to fig out the focal length thats it. To see what it would be like to have a 100mm lens on the camera. Than I found out my friend just bought a 100m 2.8 today. So I got to try it out. Great lens but I think right now I need a better all round lens. I'm looking at the 17-55 2.8. since I have the 70-300 I don't think I really need it.
I'm just trying to put together a few lens that will serve me well for a few years.
The lens I want are canon 17-55mm,Tokina AT-X 11-16 PRO DX. One day would like to go full frame to.

TC should be used with great discretion. I use a 1.4x Canon TC with my 135L. It is surprisingly good. I wouldn't consider using a 2x TC with any lens. Too much IQ and speed loss for me.

jay6776 wrote in post #8225057
...The lens I want are canon 17-55mm,Tokina AT-X 11-16 PRO DX. One day would like to go full frame to.

Do some research on the TAMRON 17-50MM f/2.8 (if you have not already). It has been a great addition for many photographers in this POTN community.