Wide Angle - Discussion / Advice (for canon efs 10-18mm lens)

[Mike41]

Hi all, 

I have a canon t5i. I purchased the canon EFS 10-18mm wide angle lens and have been very pleased with it. I am however looking for an even wider angle.

I understand this camera not being full frame will limit the field of view. So I am looking for the simplest solution to expand this wide angle further.

Does anyone have experience with a wide angle attachment lens that would work as an add on to this existing 10-18mm lens? One of those .43 or .35 etc attachment lenses. Trouble is most of them appear to be designed for not already wide angle lenses.. i think? not sure... 

I am looking for full photo without the circular fisheye effect. As in I want to capture the full frame of the image without it becoming a circle. 

Does anyone know of an attachment that will work?

or 

worst case to have to buy another lens that works with this cameras auto focus that has a wider angle? 

Thank you for your thoughtfull advice!

[Waddizzle]

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@Mike41 wrote:

all good advice and thank you! from what i have gathered, what i want to achieve isnt going to be possible without a change. I decided to take a plunge, selling the t5i, and buying a full frame canon 6d mark 2, along with a pricey but seemingly great lense for wide angle, without the fisheye effect which is exactly what im looking for, Canon EF 11-24mm f/4L USM Lens.

i think this solves it, any other thoughts appreciated!

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Canon had an application called Photostitch that i got with my Rebel T5.  I am not sure if it is still available with new cameras.  It was deigned to merge JPG files into panoramic images.  It was okay, but not perfect.  Because it worked with JPGs, it would have the occasional alignment errors.  It also limited you to a minimum focal length of 50mm, although this limitation was easily circumvented.  For a free application, it was great.