Hassle-free shopping with our 30-day return policy.
Hassle-free shopping with our 30-day return policy.
Trusted since 2012 — Greentoe is where smart shoppers save big!
Trusted since 2012 — Greentoe is where smart shoppers save big!
3069 offers placed in the last 24 hours.
3069 offers placed in the last 24 hours.
Shop with confidence. Every product is brand new and warranty-backed from authorized retailers.
Brand new & warranty-backed products from authorized retailers.
Name your price. Negotiate your deal. Save big on every purchase.
Name your price. Negotiate your deal. Save big on every purchase.
Hassle-free shopping with our 30-day return policy.
Hassle-free shopping with our 30-day return policy.
Trusted since 2012 — Greentoe is where smart shoppers save big!
Trusted since 2012 — Greentoe is where smart shoppers save big!
- Greentoe Now!LIMITED TIME DEALS
- Photo
- TV's & Home Theater
- Appliances
- Baby
- Watches
- Optics
- Pro Video
- Extended Warranties
- More Categories
Canon Mount Adapter EF-EOS R
Model: 2971C002
Topseller
10shoppers bought this in the past month
1/13
Canon Mount Adapter EF-EOS R
Model: 2971C002
Topseller
Make an Offer!MSRP:
$149.00
Lowest Online:
$99.00
Responses in minutes
Fast shipping
- Canon EF/EF-S Lens to EOS R Camera
- Maintains AF and Image Stabilization
- Dust- and Water-Resistant
Authorized RetailersManufacturer warranty included
New Products OnlyWe never sell used merchandise
Free ShippingOn most items
30 Days Returns*Minimum return policy
As Seen On...
"Greentoe wants to make the buying process easier by letting you name the price you want to pay for an item, and then they'll find a bargain on your behalf..."View article
"Consumer Reporter Lynda Baquero shows a website where you can bid on the items you want, from the manufacturer of choice, and known within a day or two if your offer is accepted."View article
"Name Your Price for Gadgets on New 'Priceline for Tech' Site"View article
"I don’t say this often, but there’s a new app that just might dramatically change the way you shop, and it’s called Greentoe."View article
"An E-Commerce Site Where You Can Haggle Down The Price"View article
"More Retailers See Haggling as a Price of Doing Business. "View article
"Greentoe wants to make the buying process easier by letting you name the price you want to pay for an item, and then they'll find a bargain on your behalf..."View article
"Consumer Reporter Lynda Baquero shows a website where you can bid on the items you want, from the manufacturer of choice, and known within a day or two if your offer is accepted."View article
What People Say...
JasGod
5/5
Incredible Site & Service
"Absolutely fantastic site to get deals on items especially if you missed out on sales in the past. I cannot recommend Greentoe enough."View article
Reviewer1661460878
5/5
Smoked
"Stumbled across this site, checked it out to see if it was legit, and Voilà I bit the bullet."View article
Reviewer2544461434
5/5
Best price!
"Placing my order for a new Samsung 43” frame tv was quick and easy. Plus I saved $100!"View article
Reviewer2331278360
5/5
Easy Peasy
"It took less than 5 minutes to find the product, create account, and make the payment. Easiest purchase ever and i saved $500!"View article
Reviewer1947189363
5/5
Like ebay but better!
"Lots of retailers are willing to look at offers and give you the best prices!"View article
Reviewer1985157698
5/5
Easy process and great price
"Simple shopping and amazing pricing "View article
Reviewer3863939974
5/5
Leary at first, but...
"I had not used or heard about Greentoe. I checked their reputation online before ordering an expensive Christmas gift. I saved 34% from best in-person price at retailers. The item arrived when and as described. Happy customer. Will use again."View article
GreatDeal2026
5/5
Smokin Football Season
"Great deal on 98" TCL TV & JBL Sound System!"View article
DealMaker1217344194
5/5
More like DealToe Now
"I’ve been shopping for a soundbar/ surround sound that I wanted and found it as a Greentoe Now offer. I had already made an offer that was countered at $962. Thought I’d take one more look and found this Greentoe Now deal and after tax came back at $878.****. Great deal!"View article
Reviewer4137920598
5/5
Finally!
"Been wanting this TV for so long but it was always just slightly over my budget. Greentoe helped me get there!"View article
KarenP193703804
5/5
Very pleased
"Easy to manuever & quick customer service response"View article
Kevybean04
5/5
Best price, Brand New amd easy to oder
"Best price and very easy to order."View article
swperk
5/5
Great selection, great prices, fast shipping!
"I found just the TV I was looking for at the best price! Easy to make the purchase, and the TV is brand new with a full factory warranty. Shipping was lightning-fast and the TV shipping box was packed inside another box, so it arrived in perfect condition. Highly recommended!"View article
Reviewer1655329426
5/5
Easy!
"Great price and easy to use. Will definitely buy from again. "View article
Reviewer1265174373
5/5
Superfast savincash
"Exactly like the title- buddy turned me onto you guys. seems pretty bad-a! Killer business model! Welcome to the 21st century!"View article
Reviewer116527698
5/5
Turntable Treasure
"Found a great Turntable at a Great Price…Easy check out! Would gladly do business with again. Plus free shipping!"View article
Reviewer3707316049
5/5
Best price, easy process.
"I randomly found this site when something for a new bulova watch I wanted, and it was the lowest price I had seen. The checkout was easy. I couldn't ask for better."View article
1ezbuyer
5/5
Great Prices and Great Experience
"I’ve purchased two TVs through Greentoe, and both experiences have been excellent. Best prices I could find anywhere, and both TVs were delivered right to my door without any issues.
My only mistake was forgetting that Greentoe offers a lot more than just TVs! I recently purchased applioances elsewhere and afterward realized I should have checked Greentoe first.
Greentoe will definitely be one of the first places I check before making a major purchase. Let's get the word out, and let the free market dictate prices. Craig Barton Scottsdale AZ"View article
Reviewer325911081
5/5
Blowing the budget cause these deals are amazing
"Got a top tier sound bar and TV for the price I was going to get just the tv. Awesome Site!"View article
Reviewer3655183426
5/5
Great deal!
"$800 cheaper than costco. Can’t believe it."View article
Reviewer1847861951
5/5
OMG Green toe rocks
"I did not have the money to buy this TV at the retail price of $2700. Thank you for offering this service. Now i can watch TV after 6 months. My current TV burned out 6 months ago"View article
Scaminjs
5/5
The only way to buy a TV
"Bought three TVs now and will come back every time"View article
Reviewer1907313029
5/5
ImchillinwithGreentoe
"I was looking me dream fridge and you guys had it at a price I could afford!!!!! Thanks SO much!"View article
JasGod
5/5
Incredible Site & Service
"Absolutely fantastic site to get deals on items especially if you missed out on sales in the past. I cannot recommend Greentoe enough."View article
Reviewer1661460878
5/5
Smoked
"Stumbled across this site, checked it out to see if it was legit, and Voilà I bit the bullet."View article
Specifications
Physical
| Dimensions | ø: 2.8 x H: 0.9" / ø: 71.2 x H: 24.0 mm |
|---|---|
| Weight | 3.88 oz / 110 g |
Adapter
| Camera Mount | Canon RF |
|---|---|
| Lens Mount | Canon EF, Canon EF/EF-S |
Canon Mount Adapter EF-EOS R is rated
2.7 out of
5 by
10.
Rated 4 out of
5
by
Joeseph D from
Great for the EF 11-24mm L Lens
This is a good option for the 11-24mm and 17mm TS-E L lenses. I took one star off for two reasons. The first is that it isn't really useable over the entire ND range. From about 5 stops and up the color shift is very strong and, at the extreme end, pretty much un-correctable. Given the first reason, I fell it is overpriced. I would still recommend it, just understand the limitations.
Date published: 2019-04-04
Rated 3 out of
5
by
Bshaker from
I guess it does what it needs to do.
I recived mine couple of days ago. The build quality on the actual adapor is good but little scroll wheel on the side for the ND filter is very loose. I feel like if a gust of wind blows by it might move... I’m not sure if mine is defective or that’s how it should be.
Date published: 2019-03-08
Rated 3 out of
5
by
jHolway from
Where are the non-variable options?
Love the size and idea behind this. But, is there a non-variable ND drop in filter for this mount? Like a set of multiple NDs? I can't stand the color shift and increased contrast variable NDs create. I'd much prefer to just carry around a few drop in's at varying ND levels, and have nice ND glass instead of a variable nd.
Date published: 2020-03-07
Rated 2 out of
5
by
MarkJH from
Not useful as advertised
I rented this to try and was not impressed for a Canon quality product. At higher ND, the color cast is horrendous & irretrievable with post processing. Useful for up to 5 stops maybe but no more than that.
Date published: 2023-06-11
Rated 1 out of
5
by
davidfromearth from
Total garbage, image ruiner
I don't understand how Canon continues to manufacture and sell this product in good conscience. It causes an absolutely terrible color caste and weird discolored shadows in the corners. I'd thought it was slightly more usable if you don't dial it to the max, but I was just doing some landscapes where I dialed it back just enough that through the viewfinder the images looked OK. But when I got home they were ruined. Imagine if you were on a vacation somewhere you'll never visit again and don't notice your images are ruined till you get home. I hope they'll discontinue the product soon. For many years I had great experiences with Canon products, but most of what I've bought in the past few years had been sub-par. I probably won't be recommending Canon to my clients anymore and I'm considering moving to another manufacturer for my own gear, too.
Date published: 2022-06-19
Rated 2 out of
5
by
RicS from
Color good at low F-stops only
Love the concept of not having to carry and change filters on the front of all my lenses but... I tried out my 1 to 10 stop variable ND filter and anything past 4 stops gives the whole image a blue tint that get more blue as you go up to 10 stops. It is unusable for recording accurate color past 4 stops in my opinion.
Date published: 2021-12-27
Rated 4 out of
5
by
KMG from
Great concept
ND filter on the INSIDE of the camera, and works with any. There should be ND filters built into any camera that does video. The dial is a little easy to turn, and I wish it had a wider usable range. I don't like that I cannot use this technology unless I'm using EF glass. There should be a way to get internal ND into the RF mount some way, obviously not with a mount adapter but some other way.
Date published: 2019-09-13
Rated 4 out of
5
by
Sproesser from
great but not perfect
Firstly, you can get aftermarket filters that fit into this now. Breakthrough technology makes the best ones.
This is really great, perfect for wides that lack filter threads. A couple times the filter fell out of the holder, exposing the internals of the lens and camera! Not good.
Image quality does not reduce at all by using these adapters! :)
Date published: 2021-11-12
- y_2026, m_9, d_21, h_11
- bvseo_bulk, prod_bvrr, vn_bulk_3.0.48
- cp_1, bvpage1
- co_hasreviews, tv_0, tr_10
- loc_en_US, sid_GT-0324235, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
- clientName_greentoe
- Canon EF/EF-S Lens to EOS R Camera
- Maintains AF and Image Stabilization
- Dust- and Water-Resistant