What is the difference between the sizes 50cm/small and 20"/small?
251430
I'm not completely familiar with thier bikes, but typically the 50cm is the frame size fit for 5'2"-5'9" males and there is the 55cm fit for taller men. But as for the 20cm, I'm guessing that's a typo?The important difference between frame size is the hight of the bike - from your seat to the floor. And the length of the bike - from the seat to the handlebars. Hope this helps.
438178
35mm is just the film size the camera takes. 50mm is the lens size. whenever you buy film just buy 35mm
498838
The only differences I know of are color and material. Size is not an issue to my knowledge.
207554
I got 49 mm, fits good.....50mm might work...............40mm is way too small!
1783019
There are two sizes I believe. google it. It has been so long since I used it I am not sure any more. Sorry.
1421372
If he is 20 pounds I would go with the small. My dog is 48 pounds and the large is to big to crush the treats and he looses interest the small is to easy to get out and brings it back in about a minute. the medium is just right for a50 pounder. they love the way it goes in all different ways when you throw it also.
932546
If 50 is referring to liters, then yes the small. I have a Redwing 50, and I use the small.
207553
I've been using a 50mm and it's been working great. A 40mm would be too small.
156320
Small is for smaller people and medium is more for medium size people...really?
228397
The small bottle 50ml is truly a travel size and very small. The larger bottle, which my wife uses three times a week per doctors instructions last a very long time, like months and months it's foamy so you use very little each time, maybe 9 months. In my opinion, the small bottle is very very expensive compared to the 7.25 oz.
1685713
Small = 20" x 47", Medium = 20" x 66", Regular = 20" x 72", Large = 25" x 77"
438176
35mm is the size of the film that the camera takes. 50mm is how wide the lens is.
2032219
The one I purchased is 43.3x31.5. They do come in smaller sizes, make sure your select the correct size.
1263816
11.5mm,12.5mm, 15mm,20mm,18mm,23mm,25mm,30mm. Choose the size yourself ,but don't support mix size.
1122526
I found the descriptions confusing too, but the large is definitely a different size than the small. Both have a grid of 3x3 post spacings, with 20 mm center-to-center spacing for the large and 13 mm center-to-center for the small. On the ones that I have, the small does not have variable spacers for the belt and fits best on a 1.25 in web belt (and won't fit on anyting larger than 1.5 in), while the large does have variable spacers for the belt and can fit much wider belts. I hope this information helps. I'm not sure if it matters from who you buy these, but neither of mine have any indication of manufacturer on them, but they work splendidly. I found the descriptions confusing too, but the large is definitely a different size than the small. Both have a grid of 3x3 post spacings, with 20 mm center-to-center spacing for the large and 13 mm center-to-center for the small. On the ones that I have, the small does not have variable spacers for the belt and fits best on a 1.25 in web belt (and won't fit on anyting larger than 1.5 in), while the large does have variable spacers for the belt and can fit much wider belts. I hope this information helps. I'm not sure if it matters from who you buy these, but neither of mine have any... » Read More I found the descriptions confusing too, but the large is definitely a different size than the small. Both have a grid of 3x3 post spacings, with 20 mm center-to-center spacing for the large and 13 mm center-to-center for the small. On the ones that I have, the small does not have variable spacers for the belt and fits best on a 1.25 in web belt (and won't fit on anyting larger than 1.5 in), while the large does have variable spacers for the belt and can fit much wider belts. I hope this information helps. I'm not sure if it matters from who you buy these, but neither of mine have any indication of manufacturer on them, but they work splendidly. « Show Less
2227256
We only bought one so I don't know about different sizes. However it looked smaller than the picture.
735074
For starters, the 50mm 1.8 is all plastic. It just doesn't have the same quality feel.Secondly the size is very different. It feels like there isn't even a lens with the 40mm on.Most important is the speed and accuracy of auto focus. The 40 is L quality. It is silent and fast whereas the 50 is slow and loud. Image quality is near the same. Wide open the 40 is clearer, but the 50 is 1.8, so that makes a diffence. Hope this helps.