Hi, I’m using a Canon EOS 700D with an EF-S 55-250mm f/4-5.6 IS II lens. I have been trying to find a used 2 x teleconverter which i have now discovered doesn’t seem to exist. I have, however, seen “Repair Parts For Canon EF-S 55-250mm f/4-5.6 IS STM Lens To EF Metal Mount” https://www.amazon.co.uk/Repair-Parts-Canon-55-250mm-4-5-6/dp/B092HZK5GN?ref_=ast_sto_dp. If anyone has any experience of this I would be grateful for any information they could give as to whether it actually works with acceptable results and what functionality I would lose. I was thinking of using it with a Kenko Teleplus Pro 300 2x DG - Canon EF Fit. Thanks
This is just a replacement mount plate for what is on your lens already, assuming yours is damaged that would be the reason to buy one. Looks like this is about half the cost used of a canon one, (us that is $150 versus $330). It DOES have the electrical contacts so it should work with the same lenses and provide electronic aperture and focus to the lens.. Draw backs should be the same with any tele-converter, primarily light drop off on your lens.. An F4 lens with a 2 x will loos light down to f8 .... this is why people with slow lenses find some long zoom lenses really struggle with tele-converters to get focus. Other than that a tele-conveter especially a 2x will usually be a hair soft especially when your magnifying a long zoom like 300mm, just enough to add post processing sharpen to the image. (Don't expect it to perform as well as a prime lens of the matching length.) Maybe some other forum members have used the Kenko brand 2x? They could speak to the optical performance of the Kenko glass in the teleconverter, and reliability of the electronic connections.
for reference to my useage of the kenko extenders / teleconverters my camera, M50 + ef to efm adapter. i use the kenko teleplus DG extenders with my ef-s lenses so yes they work because they don't have the lens element protruding like the ef type when it comes to extenders / teleconverters i see them as a bonus item rather than using them as a main reach they work best with prime lenses, usually the faster the better, with fast constant zooms like the ƒ2.8's or faster and on bright days or brightly lit objects like the moon and planets when you add an tc like the x2 you going to loose like 2 stops of light, so if you trying to track moving subjects like wild life its going to be darker meaning you going to have to sacrifice one of the other exposure settings to get the light / exposure back up, ok if its a very bright day but you also going to have the auto focus system slow down with a x2 for accuracy so thats going to impact of servos and auto focusing , for sure it works, my M50 can still auto focus with two x2 extenders stacked but it closes an ƒ3.5 down to ƒ57!! if you are wanting more reach to do wild life you better off getting something like the sigma 100-400mm / 150-600mm contemporary lenses as getting to 400mm natively is alot better than getting to 500mm with a tc, kenko also make a x3 dg btw...............not sure what the top end one is like as kenko do have a set of high end ones but the older x3 is a bit soft on my sigma ƒ2.8 50-150mm EX APO OS for canon which is an ef-s type lens the kenko DG x2 works very well, the lens itself is a stupidly sharp lens and a constant ƒ2.8 so its got a fair few + in there already, again its something i use as a bonus item or special needs like if i'm in a forest its going to be darker so my 100-400mm sigma with a ƒ5.0-6.3 is going to be a few stops of light down to start with. my sigma 150-600mm @600mm is better than the sigma 100-400mm with a x2 @800mm, i've not used the 55-250mm so i don't have a direct knowledge of its performance with or without the tc reading the original post i checked the text on my 3x it reads: 3x teleplus pro 300 kenko c-af (body is white) the 2x and 1.4x read : c-af 2x teleplus mc4 dg kenko (black body) c-af 1.4x teleplus mc4 dgx (black body) i know the ones i have are cheaper than thier top grade, the pro 300 seems softer, wether thats down to design or the light lose not sure just the info i can give from my useage if you want any other comparisons etc feel free to ask
Hi. Many thanks for the replies. Caladina, have you actually used one of the converters. Repair Parts For Canon EF-S 55-250mm f/4-5.6 IS STM Lens To EF Metal Mount” https://www.amazon.co.uk/Repair-Parts-Canon-55-250mm-4-5-6/dp/B092HZK5GN?ref_=ast_sto_dp.
Dave the link you shared is for a replacement PART for the 55-250. I mentioned that in my post earlier. It's NOT a converter. If you broke the mount plate on that 55-250 this would be a new one you could take and put on if you wanted to take your lens apart.
Hi Johnsey,. I understand that this is not a converter but it will enable me to use an EF-S lens on an EF teleconverter albeit with some, hopefully tolerable, degradation of picture quality. I was hoping that somebody might have been able to confirm that it actually works and that changing the mount plate is simply a case of a few screws and that there would not be an surprises eg springs popping out !
HI Dave, Apologies I thought your message to Caladina implied you called the mounting plate a "converter" asking if she had used it. The Mount of EF and EF itself is the same bayonet ring effectively, which is why EF lenses are backwards compatible with all apc cameras. The difference in the mount resides in allowing the focus to be closer to the sensor so you you have a closer flange to sensor distance in EFs and this allows for cheaper production of consumer wide angle lenses and the like on APC cameras Now to your question about swapping the mount plate, without even looking at the specific lens one can assume EF-s lenses to generally protude a lil further into the camera by design. So the idea of a plate to "convert" would not even seem like an applicable idea. But I did look closer at the plat you sent and it does seem to remove some of the protruding from the back of the lens. Original and your plate below.... If you made the change: Based on images you may have a lens vesrion where that circle does not apply. and you would need to cover that with electrical tape. It does seem to remove that second ring, that is protecting the rear lens element. I fear this may allow the lens to protrude slightly beyond that plate and could open it up to getting damaged, if its a problem with the tele-converter you would have to mount it to find out. You did find the Kenko designed for EFS, so you should be able to use that with the lens without cannging the plate. (As long as it supports that lens) Changing the plate will not change how far the glass moves backwards or not and if it will smack into the TC glass inside.. EF Lenses have the rear element on many up inside the lens, teleconverters by design will magnify by getting closer to that rear elements.... So you will be able to visually tell that 90% of tele-converters will not work, this is not a lens issue as much as a design limitation. Canon will not only doesn't support EF-S at all, but they don't even support all EF lenses because of the design of the rear elements on some lenses, the converter itself comes with a compatibility chart on which lenses will mount to it. I highly recommend not changing any mounting plate because it will allow dust in and may limit the lens movement if it is not a canon plate made specifically for the lens, and may limit the functionality of the lens as well. . Just my thoughts, but adding a multiplier to a cropped lens on a cropped sensor will provide magnification, but I can't see it being much better than just cropping to be honest. Also as I noted above you probably while it will function you probably will not have auto focus because 5.6 translates into f11 and it just is not much light for the camera to work with. So buying the converter is as far as I would suggest going. Beyond that getting a longer EF lens would be your next step.
yep, ef-s and ef is the same mount the difference between the kenko dg teleconverters are the lack of an protruding element thus them being designed for the ef-s lenses what comes into contact with the ef type extenders is the rear element of the ef-s type lenses as it is set right at the back of the lens so no mount changing will make a difference there. looking at images of the ef-s 55-250 lens it does have an element close to the rear mount, as its a zom it may be the moving part i'm not sure, but there could also be some electrical in comparability too i know when i put my 3x ef-s extender on an ef lens it goes batshit crazy electrically the obvious solution is to get the sigma 100-400mm c...................
