I have graduated lenses - Would I be best advised to order bifocals? And, how do you incorporate Cyl and Axis measurements?
282297
Hi Todd, I did not see option to order bifocals so I can not comment. Best..
282298
I do not know what 'cyl' and 'axis' measurements are, but, here is what we did:1. when ordering Speedo goggles, we got the +/- number, from our opthomologist.2. when ordering the ProMate snorkeling mask, we selected the the color and then selected the appropriate eye-adjustment (my son is nearsighted) from the "size" pull-down menu on the ProMate scuba options.3. My 13 year-old son loves the mask and was our family underwater photographer in Cozumel.
282299
I have graduated lenses also; however, I just went with single vision lenses in my mask. Don't know about Cyl and Axis ... I didn't bother (even tho I have an astigmatism) and they worked great
282300
I wear trifocals and the single lens correction worked just fine. I wasn't close enough to need the extra correction even when I was about 3 feet away.
606360
A laser collimator. It'll help to make sure your mirrors are aligned. It's pretty easy to do. Look on Youtube for "Collimating your Newtonian" to see how it's done. You'll usually want to check it before each viewing as they can get out of alignment with bumps. If your mirrors are out of alignment, things will get blurry. The Orion Shorty Barlow is a good accessory too if you don't want to buy extra eyepieces. It'll effectively double your eyepieces (turns your 9mm into a 4.5mm and your 25mm into a 12.5mm). Better eyepieces will make it a better scope as well. Superplossls are much better than what's included.
827925
They do have a 2.5 and 3.0, but they are all bifocal. The upper part of the lenses are plain, no correction.
2137996
There are 2 silver hex bolts sticking out of the back. One adjusts horizontal, the other adjusts vertical. Gently twist them. I overtightened one and snapped it resulting in ordering a new set of lenses.
8522
Hardy,Thanks for the info about getting better lenses. I just "bit the bullet" and bought the 24-105mm L lens. I have heard this same wise advice from other photographers, and I am looking forward to getting sharper photos with the new lens, and I will try to get only L lenses from now on. In the end, you truly get what you pay for.
15899
The lenses in these are not as sophisticated as the ones you would get from an optometrist. Consider the price! As a rule, I normally go down rather than up, so in your case I would get -3 (rather than -3.5)
1415582
basically, the same size as the reading lens in a pair of bifocals. you can trim them if necessary
35625
We do not offer custom made lenses, we use only manufacturer supplied reading lenses in standard magnifications of +1.25, 1.50, 1.75, 2.00, 2.50, 2.75, 3.00, 3.50, and 4.00. Not all of these lens options are shown in Amazon's product catalog, but we have them. If you would like to mix and match different strengths in left and right lenses, we are happy to accommodate you. You would need to order a regular pair and then write to us through Amazon's messaging system to tell us how you want to customize them. Or you could order at our direct website (same as our seller name), select a standard lens choice, and then put your customization request in the "notes" section during checkout.
391216
I think the 10mm & 20 mm eye piece comes with the telescope, & a basic laser finder, you may find it more enjoyable to order a 2x barlow extension, That mostly makes it a complete setup for the quality the scope
167244
NO. 10x25 will work but wont work well, 10 is the magnification, 25 is the radius of incoming light, its very little, you need 10x30+ binoculars for wider field of view
496261
The distance between the center of the pupils when focused on infinity (Interpupillary Distance)is not given in any of the specs for these binocs.Jim
2075683
My vision is not that far out however I have issues with small print and it is exactly what I use them for is reading. the multiple lens should give you a good match. I wear over my glasses also.
496726
The manufacturer is the first option. Don't remember if there was any address on the box. I believe they are a standard size as my eyepiece camera fits 2 different microscopes.
49300
You need to know your glasses prescription. If you're nearsighted, (need correction for distance sight your rx will be a negative number. The lenses come in 0.5 increments. For example I have a -3.75 correction. Since it is in between correction options I ordered a -3.50. (If your in between order the lesser strength). If you are far sighted the correction will be a +.(ie reading glasses). Hope that helps.
1850538
Hi, you should check lens, there should be some printing indication about your lens size on your lens
2058053
Please go to Nikon.ca and request their lens application charts to get the right answer
2103644
Iso wont make a difference. You will need to do some math to calculate your "effective F stop". Ne = N(1+M/p)N = f-numberNe = effective f-numberM = magnification = extension from infinity focus / focal lengthp = exit pupil diameter / entrance pupil diameter