Opticron 40936 SDL Eyepiece

HR Scope 18-54x (HR 66) 24-72x (HR 80)
GS Scope
18-54x (GS 665) 23-69x (GS 815)
ES Scope
23-69x (ES 80) 30-90x (ES 100)
IS Scope
12-36x (IS50) 15-45x (IS60)
16-48x (IS70)


Our Price
£269.00
£269.00
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1 year
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MPN Code
40936

EAN Code
5036422409362

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Buy Now - Pay Nothing for 6 Months, means Buy now and pay in full before 14/5/2019 (approx.) plus a £29.00 settlement fee and you will be charged absolutely no interest. Should the balance not be paid in full by 14/5/2019 (approx.) you will automatically enter into a loan agreement with 42 equal payments with a representative APR of 19.9%. If you settle earlier than 42 months you will only pay the interest accrued over the number of months you have been paying the loan.

Price of Goods: £269.00

Summary
Pay 0% Deposit
Loan Amount £269.00
Total Payable on 14/5/2019 - £269.00 + £29.00 settlement fee
Cost of loan if paid by 14/5/2019 = £298.00

Finance is subject to status. Terms and conditions apply.

Opticron 40936 SDL Eyepiece

Opticron TelescopeS

  • HR Scope 18-54x (when fitted to the 66 model) / 24-72x (when fitted to the 80 model)
  • GS Scope 18-54x (when fitted to the 665 model) / 23-69x (when fitted to the 815 model)
  • ES Scope 23-69x (when fitted to the 80 model) / 30-90x (when fitted to the 100 model)
  • IS Scope 12-36x (when fitted to the 50 model)  / 15-45x (when fitted to the 60 model) 16-48x (when fitted to the 70 model)

About Eyepieces

Eyepieces are denoted according to their magnification, whether they are wide angle (WW or WA) or variable zoom eg. 20-60x. A 20x eyepiece allows the object being viewed to appear 1/20th of its actual distance away when compared to the naked eye. Using this rule an object 500m distant appears to be only 25m away. A 30x eyepiece makes the object appear 16.7m distant while a zoom eyepiece set at 60x means the same object appears to be just over 8m away.

What magnification? Terrestrial telescopes are most commonly used for high magnification viewing over long distances in daylight. Image quality at different magnifications will depend on the optical system, the quality of glass used and the coatings applied to the surfaces of each lens. There are however a few general rules that can be applied in determining the right specification for your needs. Firstly, the relationship between magnification, objective lens dia. and the size of the eye pupil, and secondly the quality of the optics inside the ‘scope.

In normal daylight, when the pupil is dilated to between 2 and 3mm, a 66 mm telescope will deliver optimum performance, (the balance between magnification and image brightness) between 22x and 35x magnification i.e. when the exit pupil diameter equals that of the iris. In low light when the pupil becomes larger, dilating to between 5 and 7mm depending on age, optimum performance can only be obtained by using a lower magnification eyepiece or using a larger objective lens telescope such as an 80mm or 100mm. The higher the magnification, the greater the image and colour distortion. These effects can be dramatically reduced by using ED or Fluorite combination objective lenses that minimise chromatic aberration, but are expensive. At magnifications of 30x or lower, the benefits of these objective lenses are hardly noticeable when compared to conventional glass objectives.

Field of view is usually expressed as the width in metres of the image when viewing at a distance of 1000m and is directly related to the magnification. Generally the greater the magnification, the smaller the field of view. There are exceptions, namely wide-angle eyepieces which are designed specifically to provide greater fields of view. CLICK HERE for more information on Opticron eyepieces. It is important to note that the objective lens, irrespective of diameter has no influence over the field of view.

Light transmission The best way to assess the actual brightness of any telescope and eyepiece combination when choosing for daytime terrestrial use, (assuming equal optical systems) is to calculate the exit pupil diameter in the same way as with a binocular and making a trade-off between image brightness and magnification desired. For general daytime terrestrial observations good compromise magnifications are between 20x and 30x for a 60mm, 25 to 35x for a 66mm and 25 to 40x for an 80mm.

Resolution As a general rule a good telescope should be able to resolve two black dots 1.5mm distance apart on a white surface, in bright daylight from a distance of 50m.

Eyerelief This is the distance between the eye lens and the point where the pupil is positioned for full field of view and varies from eyepiece to eyepiece. In some cases the eyerelief is shorter than that required by spectacle wearers to obtain the full field of view, especially at higher magnifications. If it is important that you obtain the full field of view with spectacles please choose any of the following eyepieces: SDL, HDF (all models), HR; 40812, 40930, 40931, 40932 and 40933, IS; 40916, 40918, 40919, HR.MM2 4090. Remember, rubber eyecups although fitted to many eyepieces are no guarantee that the full field of view is obtainable when set in the ‘down' position and used with glasses.

Straight-through or 45° angled Common advantages of an angled telescope are that: i) the back, shoulders and neck are in a more relaxed position when looking through the ‘scope, ii) the tripod can be set at a lower position making it easier for people of different heights to use and the equipment more stable in outdoor conditions. Straight-through telescopes are easier to use when following fast moving objects, using the instrument from the confined spaces of a hide or vehicle, or when hand-held.

Product Code
Eyerelief (mm)
Eyelens dia (mm)
Length (mm)
Weight (g)
  40936
20-18
26
77
270

 

Our advice

Compare different models side-by-side at the same magnification if possible. Product reports are generally subjective and are no substitute for individual testing. If you are unable to test before you make a purchase, contact us for information and advice on the best model to suit your needs.

Opticron 40936 SDL Eyepiece reviews verified by reevooReevoo

2 reviews

Reviews from:Sort by:
Ease of use
10.0
Compatibility
9.5
Performance
10.0
Value for money
8.5
Overall rating
10.0
Scores 10.0 out of 10 based on 2 reviews
Show more score details
10 out of 10

John

Montrose, Scotland GB Lost in the wild!
+
Exceptional clarity. Light and flexible, it has opened up boundaries of reach and possibility for me as I travel north and south along the east coast of Scotland, and inland to the Cairngorms. Beautifully built, aesthetically pleasing, I could not possibly be happier with the MM3 GA ED 60.
Not one thing.
Confirmed purchase: 27 April 2016
Published on: 12 May 2016