Opteka Definition Telephoto Mirror Cameras Review

After I put it to the test, I was amazed at the sharpness and clarity that the telephoto lenses provided. They are perfect for capturing stunning portraits and detailed landscapes. The construction is durable and well-made. The only downside is their weight; they can be a bit heavy if you're carrying them around for an extended period of time.

This is a good budget lens but you need to know how to get the most out of it. You're stuck with the F8 aperture. I have found this lens to work best on a tripod, at low ISO and slow shutter speeds. Shooting at a higher ISO and shutter speed creates a lot of noise. Use continuous shutter advance. Out of 1000 photos, you may get ten satisfactory shots. This lens has a shallow depth of field. Use your camera's manual assist to get the best focus. I used it on my Lumix GH3 with the appropriate…

The secondary mirror is not a corrector like Maksutov's Cassegrain or Schmidt's Cassegrain. This is a reflective surface. I would guess that the reason for this is to cut costs. The idea is to fool people with what looks like a quality product but is actually poor optical design. The mirrors are probably uncoated and this makes the picture darker than you think. The secondary side is quite large for this lens, which is reflected in the lack of contrast. At night it fails the most and that was…