Off-Brand "Normal-Range" Zoom crop lens (or longer) and non-canon 1.4X TC

I didn't misread. Of course most third party crop lenses will work with an aftermarket 1.4x converter on full frame. I've done enough experimenting that this is not even a question. I'm pointing out that just because they work, not all of them will give good image quality in this combination. Some work well, like the 10-20 the OP mentioned, and others will not.

Cesium wrote in post #15395301
I've tried a Kenko 2x with a 35L before and the results were pretty terrible. Results seem to vary lens by lens.

Cesium wrote in post #15395358
I didn't misread. Of course most third party crop lenses will work with an aftermarket 1.4x converter on full frame. I've done enough experimenting that this is not even a question. I'm pointing out that just because they work, not all of them will give good image quality in this combination. Some work well, like the 10-20 the OP mentioned, and others will not.

Well I have not done the experimenting because of a lack of owning off-brand crop lenses, and it seems many others have not. I think many photographers just get rid of their crop lenses when the move to FF so they never tested them this way.

But this is definitely a question, I know because I asked it!

You did not point it out anything relevant to the question, as your example (the 35L) is not a crop lens. Plus the 2X is not a 1.4X.

I also know some lenses do better with TCs than others, but IMO most lenses don't do well with a 2X (but there are exceptions), which is why the 2X was not part of the equation.

I forgot - If you could please give one or more applicable examples, that would be appreciated (please provide an explanation of what did or didn't work well with the combination).

Again to try to make it clear.

Crop Lens + 1.4X TC (does this combination) = a little to no vignetting image on a full frame camera?

(Additionally does the combination still AF and provide adequate/decent IQ?)

Well sorry I wasted your time with my non-objective replies. Lighten up.

I'm not sure where I need to lighten up?

All I did was point out that -

1) your response didn't help, as it did not apply to the question I am looking to be answered.

2) there were things you added that I did not want anyone else misinterpreting that extra (I don't care about the 2X) as part of the question.

I'm sorry if that offended you - it was not meant to!

jimewall wrote in post #15395299
Thank you! It seems like the 1.4X will allow the porting of a crop lens to a FF. How was the IQ? Did it AF?

...

The AF was fine until the light got dim. I haven't checked the IQ yet, because I haven't had the film developed yet (that was on a film body, not a FF digital).

Off brand TC with off brand lens? Equal second rate photos whether it works or not. No thanks!

Wow...absolutely f'n amazing!!! Why can't people just do or answer what the OP asked? If not..move on. He was specific, and already acknowledged said IQ issues, and not wanting to buy other lenses..yet everyone seems to have to be "superior", and shoot the idea down. WTF?

archer1960 wrote in post #15396159
The AF was fine until the light got dim. I haven't checked the IQ yet, because I haven't had the film developed yet (that was on a film body, not a FF digital).

Ok, that is promising with AF! If you get a chance, post back when the film is developed.

Thanks!

Ebiggs maybe you missed this from the starting post (or maybe you don't care -

jimewall wrote in post #15385712
Yes - I understand that there are better lens options out there for full frame! This though would allow someone to move to a full frame camera and use a non-Canon lens that they already own until a more appropriate lens could be purchased. For instance a Sigma/Tamron 17-50mm f/2.8 OS/VC becomes a still reasonable 24-70mm f/4.0 with OS/VC.

My thought is generally just a temporary fix for someone until a more appropriate lens could be purchased. Plus answer my curiosity as to will it work.

ebiggs wrote in post #15396799
Off brand TC with off brand lens? Equal second rate photos whether it works or not. No thanks!

As to your apparent disdain of Off-brand equipment, many of us find some of them very worthwhile lenses! So your equation of off-brand lenses and TCs equating to second rate photos is garbage.

Actually I hope the majority here feel it takes more than just the equipment to make a good picture. I've seen many a photographer's work on this site that lets me believe they could make a fantastic photo with a POS camera (or is that PnS).

BOL

Somehow you missed the main idea. The use of a 1.4X combined with lenses designed for a crop camera, in order to see if they would work with minimal vignetting on a full frame camera.

Every lens you gave was a lens designed for a full frame sensor camera. I know lenses designed for FF cameras work on FF cameras - with or without a TC.

But thanks for trying to help![/QUOTE]

I think you are missing the point. The lenses I mentioned are all EF mount as are all the Sigma, Tokina and Tamron lenses I have tried (they don't do EFS), and all bar one will not work with extenders according to Canon. However they will work with this (non protruding) Kenko 1.5 extender, therefore Sigma etc will also function.

johnf3f wrote in post #15397530
Somehow you missed the main idea. The use of a 1.4X combined with lenses designed for a crop camera, in order to see if they would work with minimal vignetting on a full frame camera.

Every lens you gave was a lens designed for a full frame sensor camera. I know lenses designed for FF cameras work on FF cameras - with or without a TC.

But thanks for trying to help!

I think you are missing the point. The lenses I mentioned are all EF mount as are all the Sigma, Tokina and Tamron lenses I have tried (they don't do EFS), and all bar one will not work with extenders according to Canon. However they will work with this (non protruding) Kenko 1.5 extender, therefore Sigma etc will also function.

No, I understand they have an EF mount. But all the lenses you gave are designed for a full 35mm image circle (full frame). I specifically asked about lenses designed for a APS-C image circle (crop circle).

If you read the original question better, you will see that my question is not if the teleconverter will work or not - as I know they will fit and work.

My question is will it reduce (to the point of almost eliminate) the vignetting that happens when one uses a lens made for a crop camera sensor on a full frame sensor camera. (Secondary questions on IQ and AF ability are there too!)

So no, either you didn't understand the original question or you specifically chose to not answer it. I hope it was the former and that this clears things up for you.

I hope I didn't come across nasty, I am in a hurry to get to a basketball game. If I did I am sorry.

johnf3f wrote in post #15397530
I think you are missing the point. The lenses I mentioned are all EF mount as are all the Sigma, Tokina and Tamron lenses I have tried (they don't do EFS), and all bar one will not work with extenders according to Canon. However they will work with this (non protruding) Kenko 1.5 extender, therefore Sigma etc will also function.

he's asking about crop specific lenses...yes all third party mounts are EF mounts, but the image circle on the crop specific lenses will not cover a full frame sensor...

so the fact that an EF lens will work with a third party TC doesn't answer his question...

what he basically wants to know is will lenses such as:
Sigma 17-50mm f2.8 OS
Sigma 17-70mm f2.8-4OS
Sigma 30mm f1.4
Tamron 17-50mm f2.8VC?/nonVC
Sigma 50-150mm f2.8OS
Tokina 11-16mm
tamron 10-24mm

when mounted with a 1.4TC show any signs of vignetting on FF cameras...the only lens I own that is crop specific is a 10-20mm and we already know that one works...so i can't help...

I have two lenses and a Kenko 1.4C TC that qualify for this question ... a Sigma 8-16 and a 30 f/1.4.

The Sigma 8-16/Kenko 1.4X TC works without noticeable, objectionable vignetting on my 5DMkII, as long as I keep it above 10mm or so. Images taken with focal lengths shorter than this have to be cropped to remove the corners. This combination yields a 14-22 f/6.3-8, very slow, but usable for landscapes, etc.

Since I have a 17-40 f/4, the combination is of limited use to me, although I can see it being useful for users who switch to a FF and happen to have this Sigma and a TC, and do not have access to a 16-35 or a 17-40. The widest setting is quite a bit wider than either of the Canon UWAs, and the 8-16 Sigma looks pretty good because it is not being used at the end of its focal range as the others would be (my 17-40 seems worse when used at the shortest settings).

It's been a long time since I used the combination, but as I remember, the 30 f/1.4 and 1.4X TC work much the same on the 5DMk2, but a 42mm f/2 wasn't as compelling for me ... a 50mm f/1.8 or f/1.4 and a 35mm f/2 being more affordable than the FF UWA lenses.

Maxdave

Maxdave wrote in post #15399112
I have two lenses and a Kenko 1.4C TC that qualify for this question ... a Sigma 8-16 and a 30 f/1.4.

The Sigma 8-16/Kenko 1.4X TC works without noticeable, objectionable vignetting on my 5DMkII, as long as I keep it above 10mm or so. Images taken with focal lengths shorter than this have to be cropped to remove the corners. This combination yields a 14-22 f/6.3-8, very slow, but usable for landscapes, etc.

Since I have a 17-40 f/4, the combination is of limited use to me, although I can see it being useful for users who switch to a FF and happen to have this Sigma and a TC, and do not have access to a 16-35 or a 17-40. The widest setting is quite a bit wider than either of the Canon UWAs, and the 8-16 Sigma looks pretty good because it is not being used at the end of its focal range as the others would be (my 17-40 seems worse when used at the shortest settings).

It's been a long time since I used the combination, but as I remember, the 30 f/1.4 and 1.4X TC work much the same on the 5DMk2, but a 42mm f/2 wasn't as compelling for me ... a 50mm f/1.8 or f/1.4 and a 35mm f/2 being more affordable than the FF UWA lenses.

Maxdave

Thanks Maxdave!

Based on you statement I assume there was vignetting, but offhand do you remember how much vignetting happens at 8-10mm range with the combination?