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A58 and minolta lenses

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kapokonk View Drop Down
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    Posted: 20 October 2018 at 23:50
Hello i want to know if the minolta maxxum lenses use the real focal length in the A58, thanks and sorry for my english.
 



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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 21 October 2018 at 00:04
Yes , a 50mm lens on any format is a 50mm lens . mounted on your a58 it will give a norrower field of view than if it were mounted on a full frame sensor or 35mm film camera , on APSC , the a58 , it would give the same field of view as a 75mm lens on full frame/film . focal length of a lens is fixed by design of the lens , not the format . On APS-C it's slightly telephoto . On 35mm , it's a standard lens . On 6x6 medium format it's a moderatye wide angle and on 5"x4" sheet film it's an extream wide angle lens ( if you can findone to cover the format ) , in all cases it's still a 50mm lens focussed at infinity . Same goes for any othe lens at any focal length .

Edited by neilt3 - 21 October 2018 at 00:10
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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2018 at 08:22
Originally posted by kapokonk kapokonk wrote:

Hello i want to know if the minolta maxxum lenses use the real focal length in the A58, thanks and sorry for my english.


I don't know about you but when I first got an APS-C camera (after a long string of non-digital SLRs) I was rather confused about the whole 'equivalence' thing.

Now, with more understanding of the technology, I would suggest that you take the whole "FF equivalent" thing with a very large pinch of salt. As Neilt3 says above, a 50mm f1.8 lens on an APS-C camera is still a 50mm f1.8 lens, but you are simply croppping the edges of the frame compared to what you would see on an FF camera.

Of course, if you've been using a lot of prime lenses on FF (digital or film) and are familiar with the angle of view of those lenses, then you need to do the calculation in your head (or use a crib-sheet) to work out what focal length prime you would need to get the same angle of v iew that you are familiar with: so, for example, you need a 35mm to get the same AOV as a 50mm on FF, and 18mm to get the same AOV as 28mm.

But if you intend to use zooms on APS-C, which are plentiful, cheap to buy (the old Minolta ones and the Sony DT)) and very useable, you can forget the whole equivalence thing and just try them out. What I found was that 28mm at the wide end was not always wide enough for me on APS-C, and I prefer 24-xx mm, but that is very much a personal view. Hope this helps.

Miranda F & Sensorex, Sony A58, 5d, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras . . .
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SnowFella View Drop Down
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Post Options Post Options   Quote SnowFella Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2018 at 08:39
Focal length is absolute, crop factor is depending on your camera.
So whatever the focal length is stated on the lens (be it a DT or FF lens) is always expressed in a 35mm film equivalence.
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Phil Wood View Drop Down
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2018 at 11:39
Originally posted by SnowFella SnowFella wrote:

Focal length is absolute, crop factor is depending on your camera.
So whatever the focal length is stated on the lens (be it a DT or FF lens) is always expressed in a 35mm film equivalence.


No!

Focal length is always quoted as the focal length, regardless of the camera involved. Focal length is the distance between the sensor/film and the point within the lens where the light converges. It does not change as you change camera, but the size of the sensor does.

A smaller sensor means you capture less of the image, effectively narrowing the field of view of the lens.

When digital cameras arrived with small APS sensors photographers who were so used to 35mm film cameras began to talk about 35mm equivalent measurements which, in the case of the A58, are 1.5x the actual focal length. These define the focal length lens on a 35mm camera that would give the same angle of view as the actual lens does on a cropped sensor camera.

These may be useful to someone familiar with 35mm or FF sensor usage, but merely serve to confuse those new to interchangeable lens cameras.

In the 35mm days there were plenty of photographers using large format Hassleblads, Mamiyas, TLRs etc and even 16mm users who seem to have managed without forever quoting equivalent focal lengths - or did I miss that?

What you need to understand is what a lens will do on your camera - not what it did on 35mm. Minolta Maxxum lenses (more likely to be advertised as Minolta AF) work well on the A58, but the smaller sensor does mean that the large number of 35mm standard/hyper zooms starting at 28 or 35mm miss out on the wide angle element.

The best low cost choices to complement the A58's 18-55mm SAM II kit lens are longer zooms (the 70-210mm f4 'beercan' is probably the best but the f3.5-4.5 is also good and a lot lighter) and prime (fixed focal length) lenses that will give better quality at the cost of a zoom's versatility. Minolta 50mm macros are pretty cheap these days, are incredibly sharp and open up a new world of close-up photography (pretty good for portraits too). Going wider than 18mm can be pricey. There are also better zoom lenses at much higher prices.

You should also look to Sony DT lenses, built for APS-C cameras like the A58 - some of them are available at really good prices on ebay (the 55-200mm and 18-250mm zooms come to mind, as well as the 30mm f2.8 macro and 35mm f1.8). Take a look at Dyxum's lens section for plenty of user reviews, ratings and sample images etc. Avoid lenses with low ratings (less than 4 overall) and you won't be too disappointed.


Edited by Phil Wood - 22 October 2018 at 11:42
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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2018 at 12:01
The crop factor of the A58 is not 1.5x. It is approximately 1.555x which would generally round to 1.6x.

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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2018 at 12:16
Originally posted by QuietOC QuietOC wrote:

The crop factor of the A58 is not 1.5x. It is approximately 1.555x which would generally round to 1.6x.



Yeah , but .... saying 1.5x rather than 1.6x makes our sensors sound much bigger than Canon's APS-C sensors !
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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2018 at 12:20
Originally posted by SnowFella SnowFella wrote:

Focal length is absolute, crop factor is depending on your camera.
So whatever the focal length is stated on the lens (be it a DT or FF lens) is always expressed in a 35mm film equivalence.


"always expressed"?
I never hear anyone converting true focal length into 35mm terms .
An 18-55mm lens is always described as an 18-55mm lens not a 28-80mm equivalent , etc .
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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2018 at 13:14
So confusing, the least important the sensor being 1.5x or 1.555x - with liberties lens makers take with actual focal length that little difference is inconsequential.

The OP is not seen back since he asked the question, but I doubt this discussion will help. Every time a question like this is asked, the discussion pops up. And both sides are right, a 50mm lens is a 50mm lens, but the field of view of a 50mm lens on APS-C is the same as a 75mm (or 80mm) lens on full frame. That is not hard to understand. The problem is that we do not talk about fov....

Btw, Leica describes their 18-46mm lens on the X-Vario as a 28-70mm lens on the lens barrel.
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Phil Wood View Drop Down
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2018 at 13:23
Originally posted by QuietOC QuietOC wrote:

The crop factor of the A58 is not 1.5x. It is approximately 1.555x which would generally round to 1.6x.



1.5 is close enough - as already noted quoted focal lengths are pretty flexible. 1.5 makes the mental arithmetic easier.
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sybersitizen View Drop Down
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2018 at 16:24
Originally posted by kapokonk kapokonk wrote:

Hello i want to know if the minolta maxxum lenses use the real focal length in the A58, thanks and sorry for my english.

Has your question been satisfactorily answered?
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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2018 at 16:30
Originally posted by sybersitizen sybersitizen wrote:

Originally posted by kapokonk kapokonk wrote:

Hello i want to know if the minolta maxxum lenses use the real focal length in the A58, thanks and sorry for my english.

Has your question been satisfactorily answered?
Best post so far
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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 22 October 2018 at 21:49
Originally posted by addy landzaat addy landzaat wrote:

Btw, Leica describes their 18-46mm lens on the X-Vario as a 28-70mm lens on the lens barrel.


Cheeky buggers !
That must be the extra you get when you pay the premium for a red dot .
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Post Options Post Options   Quote SnowFella Quote  Post ReplyReply Direct Link To This Post Posted: 23 October 2018 at 09:44
LOl. Guess I shouldn't post after a craptastic day in the office and a few stabilizers later, that last "equivalence" caught me out.
Should of been "in 35mm film terms", ie to get AOV you have to add in the crop factor to whatever is printed at the front of the lens.
Unless you are Leica it seems.
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