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Forum: Lens Clubs 09-13-2009, 06:44 AM  
The Mirror Lens Club!
Posted By Abbazz
Replies: 1,239
Views: 467,310
The tiny Tamron 06B mirror lens is capable of pretty spectacular close-ups with a maximum magnification ratio of 1:2.5, a bit more than its larger sibling the 500/8, which only gets to 1:3. Here are some pictures taken today with my Tamron 350/5.6 at the minimum focus distance (1.1m):









Cheers!

Abbazz
Forum: Lens Clubs 09-06-2009, 06:59 AM  
The Mirror Lens Club!
Posted By Abbazz
Replies: 1,239
Views: 467,310
When I compare the effective aperture of my Tamron 350/5.6 with any other lens (based on the shutter speed needed to take a normally exposed picture), I find it to be F/8, while my Tamron 500/8 is in fact F/11.

Maybe some brands take into consideration light losses due to the central obstruction and to the less than perfect reflective surfaces of the mirrors but apparently Tamron doesn't. I would be curious to know if you get the same exposure from your Centon than from a refractive lens at the same aperture.

Cheers!

Abbazz
Forum: Lens Clubs 09-04-2009, 04:24 PM  
The Mirror Lens Club!
Posted By Abbazz
Replies: 1,239
Views: 467,310
Thanks Matt. This particular picture is a favorite of mine.


I have the earlier 55B and I have never tried the 55BB. In my opinion, 500mm is a bit difficult to handle without a tripod -- not impossible but the success rate drops considerably -- and the aperture of F/8 (which is a photographic aperture of about T/11 if you take the central obstruction into account) is simply not fast enough for anything but subjects in bright light.

On the other hand, the little brother from Tamron (the 350/5.6 06B lens) is a bit sharper, has more contrast, is much easier to handle and one full F-stop faster.


Thanks Ash. To me, this is the main point of using a mirror lens. If I only need the reach, I have more capable telephoto lenses, which are able to deliver pictures with fine detail and high contrast. So when I choose to use one of the mirror lenses, it's because I'm looking after the particular look of the pictures taken with these lenses.


Thanks Raybo. You wouldn't have to pay much, as these lenses usually go for little money.;)

Cheers!

Abbazz
Forum: Lens Clubs 09-04-2009, 12:45 AM  
The Mirror Lens Club!
Posted By Abbazz
Replies: 1,239
Views: 467,310
I guess the Minolta RF Rokkor-X 250mm F/5.6 is the shortest, at least among lenses available to the general public -- there were strange mirror lenses of all focal lengths designed for scientific and military applications.

The Tamron SP 350mm F/5.6 is also one of the shortest and lightest mirror lenses available. Here are a few pictures taken in Cambodia with this lens (sorry if you have already seen them):

















And if you ask me, I don't think it's suitable to remove the donut bokeh with Photoshop. Most of the time, it looks just nice! And what's the purpose of using a mirror lens if you make the pictures look as if they were taken with a not-so-sharp ordinary telezoom?

Cheers!

Abbazz
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