Specification
Product Details
- Brand: Kelda
Features
- 500mm f/8 Studio Series Telephoto Mirror Lens
- Use with manual or automatic SLR & DSLR cameras
- Multi Coated low-dispersion glass, anti-reflection coating
- A Multi-coated low-dispersion glass capable of producing sharp, high definition images
- T-Mount Lens (T2-thread) with Sony Alpha / Minolta AF adapter
Product Description
Brand NEW Studio Series 500mm f/8 Telephoto Mirror Lens
This Studio Series lens is computer-designed using a combination of lenticular light refraction and
reflection optics--the same physics used in many professional telescopes.
Combined with advanced manufacturing techniques, the result is a lens with very sharp picture
quality with less color abberation which is considered the most harmful factor in the field of
telephoto photography.
This lens is a highly complex, precision-made, optical instrument it is also compact and lightweight.
It is ideally suited for wildlife and sports photography. It has a fixed aperture of f8. It comes with
a soft pouch and three (3) rear mounted 30.5mm filters - ND2, ND4 and Skylight.
Features:
* Use with manual or automatic SLR & DSLR cameras
* A Multi-coated low-dispersion glass capable of producing sharp, high definition images
* Auto focus and infrared compatible
Compatible Cameras:
Sony Alpha / Minolta AF Mount Cameras
Lens Type:
500 mm f/8 Telephoto Mirror Lens
Specifications:
Elements/Groups: 8/8
Fixed Aperture: f/8
Diameter: 3"
Length: 3.4"
Weight: 360 grams
Coating: Multi
Filter Size Rear: 30.5mm
Filter Size Front: 72mm
Contents
* Mirror Lens
* Front and Rear Lens caps
* Storage Pouch
* Specifications and information sheet
* 30.5mm filters - ND2, ND4 and Skylight
* T-Sony Alpha / Minolta AF mount adapter
Customer Reviews
Most helpful customer reviews
2 of 2 people found the following review helpful.
The lens image quality is simply terrible.
By Retired Physicist
I have used the product for 2 days.The best focus obtainable with this lens, even at long range (1 mile), after running carefully through a fine-focus series, is still very blurry. I compared it to my home made mirror telephoto lens, which gives crisp, nearly diffraction limited image quality. Even when I modified the 500mm f/8 lens to operate at f/11, the improvement was not worth the effort. Since I cannot return it (because of modifications) I will try to find some way to use it - - maybe as part of a holiday ornament. I am a retired physicist with considerable optical skills.
2 of 2 people found the following review helpful.Almost unusable
By Steven Mitchell
I chose this Lens because it was the same build as the famous Sony version for my Sony Alpha.Great potential, but so soft it was unusable. Honestly I have a Tamron 18-270mm, and using this and cropping to the same size gives me a superior result..... This lens is manual everything, and image stabilisation does not have much effect, even on a monopod.......Sorry.... Spend the extra on a real lens
2 of 2 people found the following review helpful.
Shoot For The Moon
By systmdamage
It isn't a bad lens for the price. The only reason that I bought this lens was to get some good shots of the moon, and it did its job. I'm sure with high-end lenses one could get cleaner photos, but with something that I will only use once in a while it was well worth its price.
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