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According to the light source, reflect sight can be divided into direct bulb red dot and diaphragm red dot. Diaphragm is the traditional red dot light source technology, while the direct bulb technology is more advanced.

Both of them have a built-in light source in the red dot, the built-in light source of the direct red dot is a very small lamp bead, by projecting the light source directly on the lens to form the red dot, the size of the lamp bead determines the size of the red dot on the lens.

In contrast, the built-in light source of the diaphragm type red dot is large and scattered, and the size of the red dot is controlled by covering the light source with a film with a small hole, which we call the diaphragm. The larger the hole in the diaphragm, the larger the size of the red dot, and vice versa, the smaller.

Since the light source of the diaphragm red dot is diffuse, the brightness of the red dot projected onto the lens through the small hole is various on different position of the lens and usually strongest in the center of the lens, and when aiming at the target through the edge of the lens, it becomes dim or even disappears.

The brightness of the red dot of the direct light source is maintained at its strongest regardless of the position on the lens, minimizing the limitation of the use of the red dot. When the lens is partially broken or covered by mud stains, you can use the intact part to aim; in extreme weather such as snow and sand, the red dot always remains strong and bright to ensure the shooting experience; for rapid shooting, you can also aim at the target through the edge of the lens instead of using the center dot.

Prism scopes, literally speaking, are fixed magnification optics that have a prism inside, which means that their constructions are much more compact and robust than a traditional scope. Their magnification is fixed and low: 1x, 2.5x, 3x, 4x, or 6x. And they are usually equipped with an illuminated and etched reticle, users can choose between green and red illumination. But what exactly enables them to stand out from traditional scopes? The answer is, their diopter adjustment setting. With red dot sights, users with astigmatism may suffer from an unclear image of the reticle, but with prism scopes, they can always adjust the diopter to see a crisp reticle!

However, the fixed and low magnification also means that prism scopes have a relatively small eye-box and limited eye relief, which are perhaps the only downsides.

With ffp scopes the reticle gets smaller as you lower the magnification and thicker as you increase it.

The more the ffp scope has zoom power the bigger the challenge will be for the manufacturer to have a reticle thick enough to be visible at lowest power and fine enough at the highest power. Here's where the reticle shape becomes really important.

lFirst Focal Plane(FFP)(第一像面): FFP scopes house the reticle assembly near the front of the magnification erector assembly. With first focal plane optics, the reticle size changes as the magnification increases and decreases. FFP optics keep the measurements of the reticle accurate at any magnification range. (High-end optics/Tactical/Shoot long range)

Pros:

ØFFP’s use of reticle subtensions at every magnification setting

ØWhen it comes to reticles that use ballistic drop compensation, a first focal plane scope is a must-have.

Øat higher magnification levels, the subtensions are accurate and easy to see.

Cons:

ØAt close range, the reticle can appear very small and hard to see. 

ØFor lower-powered optics, the usefulness of an FFP reticle declines.

lSecond Focal Plane(SFP)(第二像面): SFP optics house the reticle behind the erector tube assembly. With second focal plane optics, the reticle remains the same size throughout its magnification range, the reticle’s various subtensions aren’t accurate through the range of magnification. (Affordable price tags/Low-powered LPVO/Hunting)

Pros:

ØWith low powered optics, like 1-4X optics, an SFP reticle is easy to use for close-range shooting. It’s big, easy to see, and fast.

Cons:

ØSFP subtensions suffer at every magnification range but one. This makes higher-powered SFP optics nowhere near as fast or as useful for on-the-fly long-range shots.

Most in-stock orders ship within 1-2 days from our ShangHai based warehouse. Orders that require shipment from our vendors or are for custom-built products, e.g. prescription eyewear or custom riflescopes, may take slightly longer to fulfill. For faster delivery, please tell us an expedited method of shipment at the time of ordering. On the rare occasion an item is not available for immediate shipping, you will be notified with an estimated time of arrival for the item. Once contacted, you may allow the order to continue or make any adjustments, including cancellation, if desired. If an order cannot ship in its entirety, Vector Optics reserves the right to hold the order until all items are in stock or to send as items become available.

We want your business experience with us to be both safe and convenient. We offer a wide variety of payment options so that you can choose the one that best fits your needs. Vector Optics accepts PayPal ,  Moneybookers, Moneygram, Western Union or Bank T/T Wire Transaction or Credit Card (in US only) etc .Please and feel free to contact us if there are any questions.

If you are using a 40mm objective, then you can use the lowest rings and bases available, as the bell will certainly clear the barrel with no problem. i.e. don't worry if the bell ends up being higher than 1/4" over the barrel.

E.G.40mm or less - low rings all the time 50mm obj - low rings on < 5 contourMedium rings > #5 and up (strait barrel get med high) 56mm obj Medium on < 5 contour (sometimes med high)Medium high on sendero contourHigh on >7 contour34mm...50mm objective - lows will work all the time56mm objective - lows < sendero or #5 contour Sometimes lows will fit number 7 contour barrels, but it depends on how long the shank is after the smith installed it. Highs for sure anything larger than #7 This is assuming our ring height and our rail height. Also using buttler creek caps. 

We mainly use UPS, DHL, EMS and Air Register Mail for worldwide shipping..

EMS Express can be tracked on www.ems.com.cn and your local post office. Air Register Mail can be tracked by your local post office. Both need your signature to accept.

All UPS orders are traceable on our UPS tracking page or directly on the UPS website. To track a package on the UPS site, just enter the UPS tracking number in the "Enter Tracking Number" box and select "Submit". UPS scans each package and updates the tracking number with the latest information at each checkpoint. The status of the package displays where the shipment is and, if received, who signed for it (if available) and the time of delivery. Please note, for most orders, that it might take up to 24-48 hours for the first scan to show on the UPS website.

If you need the track number, please send an e-mail or leave a message to us for acquisition.

We can also use other express shipping, such as:DHL, FedEx and TNT etc, while the cost will be higher. You shall contact us first if you need mentioned above service.

Shipping insurance is optional and it is up to the customer.

If you need to know the detailed shipping cost, please visit our website as following link.

http://scvector.biz/new_reader/items/ups-detailed-shipping-cost.html

http://scvector.biz/new_reader/items/ems-detailed-shipping-cost.html

Guys,For all new guys, there is a systematic way of calculating ring height that doesn't require more than a simple elementary school ruler. You measure 3 things:1. the height of the front of your base/rail from the barrel2. the height of your rings from the top of the rail to centerline 3. the outside diameter of the bell of the scope (not the size of the objective lens)Here is the equation:[rail height + ring height] - [bell diameter x 0.5]If the value is positive, then your bell will clear the barrel. Optimally, you want that bell to be about 1/4" or less over the barrel. This will give you a tight cheek weld and provide for more precise trajectory. Be sure to account for Butler Creek caps if you intend on using them.If you are using a 40mm objective, then you can use the lowest rings and bases available, as the bell will certainly clear the barrel with no problem. i.e. don't worry if the bell ends up being higher than 1/4" over the barrel.

E.G.40mm or less - low rings all the time 50mm obj - low rings on < 5 contourMedium rings > #5 and up (strait barrel get med high) 56mm obj Medium on < 5 contour (sometimes med high)Medium high on sendero contourHigh on >7 contour34mm...50mm objective - lows will work all the time56mm objective - lows < sendero or #5 contour Sometimes lows will fit number 7 contour barrels, but it depends on how long the shank is after the smith installed it. Highs for sure anything larger than #7 This is assuming our ring height and our rail height. Also using buttler creek caps. 

Retail

If you want to buy items in retail and prefer payment via credit card or Western Union please go to online store www.aliexpress.com/store/701234 If prefer payment via Paypal please go to online store stores.ebay.com/SC-Scopes

Wholesale

If you are retail dealers or want to be distributors please e-mail (alan.duan@vectoroptics.com.cn) to us to acquire our standard quotation list. Or add interesting item and quantity to your cart, we will quote for you asap. We will be much appreciated that we can have some initial information of your company and market.Thanks again for your cooperation and we look forward to doing business with you.

TAC Vector Optics