Take a look at the spec sheets..the two pinhole variants seems to be a 3.7mm lens but only 63 degree andgle of view.... http://www.hikvision.com/UploadFile/image/2014030617394252141.pdf
the tube lens on the other hand is available in various sizes....the 4mm default giving you 73 degrees....you can go wider with 2.8 or even 2mm but i would not go lower than 2.8 unless absolutely needed. The 2mm will probably be too wide and you will get a distorted image and loose too much detail...http://www.hikvision.com/UploadFile/image/2014030617400588936.pdf
The pinhole is good if you will be hiding the camera in a wall or some object and you dont want it visible at all. If you just want a small less noticeable camera the tube us better...
Note that the 4mm has a wider view than the 3.7mm in this specific instance because the focal ratio is different...one is F2.0 the other 2.3...
Normally with the same specs the lower the mm the wider the angle of view.
Thats weird. Email them and let them know what going on...or try another seller with good reviews
If you are in rush wrightwood has the 2.8mm tube one for 250 and i believe LTS (member @milkisbad) has them as well.
I was trying to place the oder on my iPhone and thats when I received the "can not ship to your country". I tried to place the order on my computer and it worked. Now to find a credit card that will be accepted. My credit cards are not being accepted at this Huaben site (mostly wells fargo).
Yeah, to be fair 158 is still a good price... Mary lee has always been very responsive to my emails. Also if you buy a few cameras you can get a discount of free dhl shippong..just email her in advance...agree on a price...place the order and wait for her to adjust the price before you pay for it. (they have a two step process so you can place an order before actually paying).
It depends on if its in stock or not. Generally its takes 3-4 days until its shipped. If shipped via post its about two weeks until you get it. DHL is about 4 days...I noticed that shipments via dhl are more likely to get charged a fee at customs...(its usually only a few dollars)....